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  Fabaceae : Vicia americana

  R. Neil Reese

  Vicia americana is a rhizomatous, perennial herb, the stems sprawling to climbing, 20-100 cm long and smooth to having a sparse covering of hairs . The alternate leaves are compound pinnate with 4 to 8 pairs of elliptical to linear leaflets 10-38 mm long , a pair of stipules ~8 mm long, and with a tendril at the end of the leaf. The inflorescences are racemes in the axils of the upper leaves. The peduncles are well developed with 3-10 flowers. The calyx forms a tube 3.5-5.5 mm long with unequal teeth, the upper short and broad the lower narrower and pointed, 1.2-4 mm long. The papilionaceous corolla is blue to purple, rarely white. The banner is 12-25 mm long and the wings and keel shorter. The fruit is a legume, 2.5-3.5 cm long with 2-14 seeds. American vetch blooms from May to July in a variety of dry, open to moist, shaded habitats; mixed grass prairie, sagebrush steppe, meadows, pine forest, and deciduous woodlands throughout South Dakota.

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  Fagaceae : Quercus macrocarpa

  R. Neil Reese

  Quercus macrocarpa is a deciduous coarse shrub to large tree, with deeply furrowed bark, growing up to 30 m in height and with the trunk more than 1 m in diameter. The simple, alternate leaves are obovate, pinnately lobed, 10-25 cm long and 5-15 cm wide. The leaves are usually shiny green on the upper surface and silvery due to star-shaped hairs on the lower surface and can vary greatly in size and shape depending on location and climate. Burr oak is monoecious, the green male flowers develop in pendulous catkins, each flower with a 5-lobed calyx and 5-10 stamens. The green female flowers are solitary or in small clusters in the axils of new growth, have 6 sepals and an ovary embedded in the surrounding tissues, with styles exerted. The fruit is a nut (acorn) surrounded by a deep cup, the margins and sides often fringed, that envelops half or more of the ovoid nut that is up to 4 cm long and 4 cm wide. Burr oak flowers in April and May in upland forests and along lake shores in much of South Dakota.

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  Fumariaceae : Dicentra cucullaria

  R. Neil Reese

  Dicentra cucullaria is perennial herb, which grows 6 cm to 30 cm in height, with the flower stems and basal leaves rising directly from a scaly rootstock. The erect to ascending basal leaves have long petioles (5-15 cm}, the compound pinnatifid blades are ovate to triangular, 10-26 cm long, divided 2-3 times into lacy segments 1-3 mm wide, with entire margins. The flowering stems (scapes) are 10-30 cm tall, terminating in a raceme of 3-15 flowers, subtended by whitish bracts. The flowers are shaped like pantaloons. The 2 membranaceous sepals are white, sometimes streaked with purple, 2-3.5 mm long and 1.5-2.5 mm wide. The 4 white petals are yellow tipped, the outer 2 petals are spurred 10-15 mm long, the inner pair, oblanceolate, 7-12 mm long and convergent coherent at the top. The fruit is a capsule, 10-15 mm long, 3-6 mm in diameter. Dutchman’s breeches bloom from March into May in moist woods in eastern South Dakota.

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  Gentianaceae: Frasera speciosa

  R Neil Reese

  Frasera speciosa is perennial herb with a simple, erect stem, 20–150 cm in height, that is smooth to having a covering of tiny, scattered hairs. It grows from a woody base surrounded by a rosette of large oblanceolate leaves that measure 7–25 cm long. The lanceolate cauline leaves are whorled, smaller and more linear than the basal leaves. The inflorescence is a tall, erect panicle with flowers densely clustered at the top and spread out in separated clusters below. The numerous whorls of flowers are each subtended by gradually reduced, leafy bracts. The flowers have a calyx of 4 narrow, green pointed sepals, 8–15 mm long, and a corolla of 4 broad, yellow green pointed petals, 1-2 cm long, each with purple spots and two fringed nectary pits at the base. There are four stamens tipped with large anthers and a central ovary. The plant is monocarpic, growing as a rosette of leaves for several years and only producing a flowering stem once before it dies. The fruit is an oblong capsule, 1–2 cm long. Monument plant blooms from May to August depending upon elevation. It grows in meadows, woodlands, and mountain forests, primarily at moderate to high elevations in western South Dakota.

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  Gentianaceae : Gentiana andrewsii

  R. Neil Reese

  Gentiana andrewsii is perennial herb growing 10-70 cm tall, the stems smooth to minutely hairy. The simple, opposite leaves are 1.8-8.4 cm long and 0.5-3.5 cm wide, sessile, tapering to a point, and the leaves tend to become larger as they ascend the stem. The inflorescence is a dense terminal cluster of flowers, occasionally with additional clusters in the axils of upper nodes. The calyx tube is 10-12 mm long with 5 lanceolate lobes 4-10 mm long. The blue to purplish, occasionally white, corolla forms a 2.8-4 cm long, closed tube, the petals incurved, with the flowers resembling large buds. The fruit is a capsule, ~25 mm long, and wrapped with the dried petals and contains numerous winged seeds. Closed bottle gentians bloom in August and September in wet meadows, prairies and woods in western and northeastern South Dakota.

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  Gentianaceae : Gentiana puberulenta

  R. Neil Reese

  Gentiana puberulenta is a perennial herb with simple, erect to ascending stems, rarely branched, the stems typically reddish tinged, with a covering of minute, soft hairs, and growing 15-50 cm in height. The simple, opposite leaves are sessile to subsessile, lanceolate, 1-5.5 cm long and 0.3-2 cm wide, with entire margins. The leaf pairs are at right angles to those above and below. The inflorescences are in clusters of 3-10 flowers at the top of the stem and sometimes also in the upper leaf axils. The calyx forms a tube, 7-18 mm long with lobes, 4-18 mm long. The blue purple to rose-violet corolla is funnel-shaped, 3-4 cm long, with the lobes erect to spreading. Inside the tube, the base of the petals is white with dark blue stripes or streaks. The fruit is a capsule that contains numerous winged seeds. Downy gentian blooms from August into October in drier prairies and upland woods on the eastern and western borders of South Dakota.

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  Geraniaceae: Geranium viscosissimum

  R Neil Reese

  Geranium viscosissimum is a perennial herb growing with 1 to a few branching stems that form clumps. The stems, 30-90 cm tall, generally have short, stiff hairs below and longer hairs toward the top near the flowers, with glands throughout, the foliage is sticky to the touch. The petiolate leaves are mostly basal, with flat stiff hairs and glands that exude the sticky substance. The blades are 5-10 cm wide, palmately lobed with 5-7 sharply toothed divisions. The few culm leaves are mostly opposite, nearly sessile and somewhat smaller than the basal leaves. The inflorescence consist of small clusters of two to several pedicellate flowers attached to axillary peduncles. The 5 sepals are 8-12 mm long, pointed with short hairs on the tips. The 5 petals are pink to purple, 14-20 mm long, with long hairs toward the base and darker stripes converging on the center. There are 10 fertile stamens and a 5-parted style. The fruit are capsules with glandular-stiff-hairs and are shaped like an upraised crane's bill. Sticky geranium blooms from May into August in open woods and along streambanks in western South Dakota.

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  Grossulariaceae : Ribes americanum

  R. Neil Reese

  Ribes americanum is a perennial shrub, with erect to ascending, unarmed stems, growing 1-1.5 m tall. The younger stems are hairy, and dotted with yellow glands, becoming smooth and gray to black with age. The simple, alternate leaves are nearly round in shape, 3-8 cm long, with 3 deeply parted lobes and 2 shallow lobes at the outer edges. The leaf margins have sharp to rounded teeth, the upper leaf surface is smooth, and the lower surface is covered with hairs and small glands. The inflorescences are composed of hairy, axillary, drooping, racemes with 6-15 flowers. The calyx is tawny brown at the base, becoming greenish white above, 8-10 mm long, the hairy, bell-shaped hypanthium is 3-4.5 mm long, with 5 sepal spreading to reflexed lobes, 4-5 mm long. The 5 petals are white 2-3 mm long, inserted at the top of the hypanthium. The 5 stamens are inserted between the petals, have a broad base, are tapered toward the top. The fruit is a black, ovoid berry, 6-10 mm in diameter, with persistent floral remnants on the end. Black currant blooms in May and June on the edges of woods, in moist ravines and along streambanks in much of South Dakota.

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  Grossulariaceae : Ribes aureum var. villosum

  R. Neil Reese

  Ribes aureum var. villosum is a perennial woody shrub, erect to arching main stems are 1-2 long, the younger stems and branches light brown, darkening with age. The stems are unarmed. The alternate, simple leaves develop directly on the branches of the current year and in clusters on projections from older stems. The leaf petioles are 2-5 cm long, the blades about the same length, broadly diamond to oval shaped, with 3 main rounded or bluntly pointed lobes, occasionally more, often further divided into shallow lobes. The margins are entire, or with a few blunt to rounded teeth. The inflorescence consists of axillary racemes of 3-8 flowers on peduncles 3-6 mm long. The yellow calyx tube is 10-14 mm long with 5 reflexed lobes, 3-5 mm long and showier than the corolla. The corolla has 5, erect, yellow petals, 2-3.5 mm long, often with all of the petals or their distal ends turning red. There are 5 stamens 1-2 mm long, attached to the hypanthium opposite the sepals. The fruit is a globose berry, 7-9 mm in diameter, greenish yellow and turning black as it matures. Buffalo currant blooms in April and May on dry, open hillsides, along the edges of thickets and streambanks, predominantly in western South Dakota.

  Synonym: Ribes odoratum

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  Grossulariaceae : Ribes hirtellum

  R. Neil Reese

  Ribes hirtellum is a perennial shrub, with erect to ascending stems with 1-3 nodal spines or often lacking these spines, the stems growing 0.5-1.5 m in height. The internodal prickles are few when present. The upper stems develop thin gray bark, shedding away along with any prickles, and the older branches are brown. The simple, alternate leaves are usually clustered on short lateral shoots, with slender, hairy petioles are up to 5 cm in length, often longer than the blades. The blades are almost round in outline, 1-5-3.5 cm long and 2-4 cm wide, with 3 major lobes and 2 smaller outer lobes. The margins have shallow, rounded teeth. The flowers are solitary or in small clusters along the stem, with slender, hairy pedicels 5-8 mm long. The flower parts form a yellow to lightly purplish, bell-shaped, hypanthium that is 5-8 mm long with 5 light green, flared sepals 3-4 mm long, and with 5, erect petals, 1-2 mm long. There are 5 stamens, opposite the sepals, 3-5 mm long, exerted above the petals. The fruit is a smooth, blue to black, ovoid to spherical berry, 8-10 mm in diameter, with persisting floral remnants on the end. Hairystem gooseberry blooms in May and June in rocky woods, along hillsides, in ravines and thickets along the eastern edge and western half of South Dakota.

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  Hydrophyllaceae : Hydrophullum virginianum

  R. Neil Reese

  Hydrophyllum virginianum is a rhizomatous perennial herb with stems growing 10 to 90 cm in height. It has basal and alternate cauline leaves that are deeply pinnately divided, 5-30 cm long and 5-15 cm wide, with 5-9 ovate lanceolate to rhombic segments, each up to 11 cm long with the lowest pair distinct. The petioles are 5- 25 cm long and the leaf blades often have white markings that look like water spots. The inflorescence consists of 1-several subcapitate clusters of flowers, the peduncles 2-20 cm long, lifting the flowers above the leaves, and each flower has a pedicel up to 1 cm in length. The 5 linear lobes of the calyx are 4-7 mm long and have hairs along the edges. The bell-shaped corollas are white to purple, the tube 3-5 mm long with 5 lobes 3-5 mm long. The stamens are exerted 4-8 mm beyond the petals and the style is exerted by 5-10 mm. The fruit is a 2-seeded capsule. Waterleaf blooms from May into July in mesic woodlands in eastern South Dakota.

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  Irdaceae : Iris missouriensis

  R. Neil Reese

  Iris missouriensis is a rhizomatous perennial herb with erect, leafless. flower stalks (scapes) 25-60 cm tall. The basal leaves are linear, 25-45 cm long and usually less than 1 cm wide. The 1-2 flowers emerge from a spathe, 5-7.5 cm long. Each flower has 3 light to dark blue, spreading or reflexed sepals, 4-6 cm long, lined with purple and with a whitish blotch at the base, and three smaller, upright blue petals. There are 3 stamens opposite the sepals. The fruit is an oblong, 6 angled capsule, 5-8 cm long. Western blue flag blooms in June and July in wet meadows, along streambanks and open woodlands in western South Dakota.

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  Iridaceae : Sisyrinchium campestre

  R. Neil Reese

  Sisyrinchium campestre is a perennial grass-like herb with narrow, winged stems, 10-40 cm tall and 1-2 mm wide. The basal leaves are about 1/2 to 2/3 the length of the flowering stems. The flowers emerge from a sessile spathe, the outer bract 2.5-4.5 cm long and the inner bract about ½ the length, with a pedicel that is exerted just beyond the spathe. The 6 tepals are up to 10 mm long, white to pale blue, sometimes having bluish stripes, rounded at the tip with a small, needle-like projection. The fruit is a rounded capsule, 3-6 mm in diameter. White-eyed grass blooms from April to June in prairies and open woods in eastern South Dakota.

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  Juglandaceae : Juglans nigra

  R. Neil Reese

  Juglans nigra is a large tree with brown bark that grow to 25 m tall with a trunk up to 1 m in diameter in a forest stand. Individual specimens growing under ideal conditions can grow much larger. Young twigs are green and covered with glandular hairs. The alternate, compound palmate leaves grow to 50 cm long, the 11-23 leaflets are sessile, oblong lanceolate, pointed at the tip and usually with small teeth along the margins. The trees are monoecious, with green male flowers in catkins up to 12 cm long, each with about 4 sepals and 8-40 stamens. The female flowers are terminal on new growth in clusters of 1-several flowers, each with 3 small bracts and a hairy pistil with a short style and 2 yellow green stigmas. The fruit is a globose, yellow green turning brown nut, 5 cm in diameter, containing a nut 4 cm in diameter. Black walnut blooms in April and May. This species is native to the southeastern corner of South Dakota, but has been planted in windbreaks and yards state wide, becoming naturalized throughout the state.

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  Juncaceae: Juncus torreyi

  R Neil Reese

  Juncus torreyi is a perennial herbaceous rush form loose colonies from a creeping rhizome, with stiffly erect, unbranched culms 30-80 cm tall. There are 1-3 basal leaves and 2-5 alternate leaves on the culms. Leaves are round in cross-section, often longer than the culms, with cross partitions at regular intervals. The sheath is open at the front with a pair of rounded lobes, 1-4 mm long. The inflorescence consist of 1-many flower heads in a tight cluster at the top of the stem. Each flower head is 1-1.5 cm in diameter, round, with up to 100 flowers. Each flower has 6 tepals, green to straw-colored, drying to dark brown, in 2 whorls, the outer set longer than the inner set. There are 6 stamens, a 3-parted style and the fruit is a capsule. Torrey’s rush blooms from June into October along lakes, streams in wet prairies and ditches throughout South Dakota.

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  Lamiaceae: Agastache foeniculum

  R. Neil Reese

  Agastache foeniculum is a perennial rhizomatous herb, which grows 0.6 m to 1 m in height. The stems are square with opposite ovate to broad to lanceolate simple leaves, greenish above and whitish underneath due to fine, appressed hairs the leaf margins are finely toothed. When crushed the leaves smell of anise. Flowers open in July and August and are arranged in a terminal spike-like raceme. The tubular calyx is 5 toothed 5-7 mm long and lavender toward the tips. The corolla is 2-lipped 7-10 mm long and lavender to bluish-purple in color. Stamens 4 and exerted from corolla. Pistil with 2 carpels with a 2-part style. Fruit are 4 nutlets. Lavender hyssop blooms from June through September. This species is commonly found in upland woods and prairies in both eastern and western South Dakota.
  
  
  

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  Lamiaceae : Mentha arvensis

  R. Neil Reese

  Mentha arvensis is an aromatic, perennial, rhizomatous herb with square, simple to branched, ascending to erect stems growing from 30-90 cm tall. The stems are usually hairy to nearly smooth with rings of hairs at the nodes. The simple, opposite leaf blades are lanceolate to ovate, 2.5-12 cm long and 5-40 mm wide, slightly small toward the top, with the upper surface generally without hairs and the lower surface with hairs along the veins. The margins are toothed with hairs along the edges and the petioles are 3-15 mm long. The inflorescence consist of paired 8-30 flowered cymes in the axils of leafy bracts. Each flower with a pedicel 1-3 mm long. The 5-lobed hairy calyx is tubular to bell-shaped, 2.5 -3.3 mm long, with teeth about ¼ length of the tube. The weakly bilabiate corolla is whitish to lavender in color, 4.5-6.5 mm long. The 4 stamens and the style are exerted from the corolla by 1-2 mm. the fruit are 4 nutlets. Field mint blooms from July into September in moist shaded sites, streambanks, lake shores and marshes throughout South Dakota.

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  Lamiaceae: Monarda fistulosa

  R. Neil Reese

  Monarda fistulosa is an aromatic, rhizomatous perennial herb with simple to branched, square stems, 30-120 cm tall, the upper portions hairy. The simple, opposite leaves are petiolate (10-25 mm long). The blades are lanceolate to ovate, 2-5 cm long and 4-20 mm wide, with small glands, a pointed tip, and toothed to subentire margins. The inflorescence is a terminal cluster of flowers on the main stem and branch ends, 1-5 cm wide, excluding the corollas, and subtended by green to whitish bracts, 1-2.5 cm long. The calyx forms a hairy tube, 5.5-11 mm long with teeth up to 1.5 mm long. The pale to dark lavender (rarely white) bilabiate corolla is 2-3.5 cm long, the outer surface hairy, the tube at the base slender, 15-25 mm long, the upper lip erect and shorter than the tube, and the lower lip is spreading, 3-lobed. The stamens are exerted from the upper lip. The fruit are 4 brown to black nutlets, 1.5-2 mm long. Beebalm blooms from June into September on prairie hillsides, along roads and open woodlands in most of South Dakota.

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  Liliaceae : Allium cernuum

  R. Neil Reese

  Allium cernuum is a perennial herb, which grows from a membranous bulb with stems 30 cm to 45 cm in height, that are usually bent just below the cluster of flowers. Each mature bulb typically bears a single flowering stem with up to 30 flowers. The leaves are keeled grass-like, flat or channeled and 2-4 mm wide. Flowers emerge from a membranous spathe in July and August, with the umbel nodding or laterally projected. The tepals are 3-5 mm long and white to pink in color. The 6 stamens are exerted from the tepals, and the ovary is prominently 6-crested. The fruit is a 3 valved capsule. This species is commonly found throughout much of Northern America in mountainous and cool regions, on ledges, gravels, rocky or wooded slopes and crests. Because of its wide distribution, it is variable in plant size, flower color and bloom time.

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  Liliaceae: Allium stellatum

  R. Neil Reese

  Allium stellatum is a perennial herb, arising from a bulb as a leafless scape growing from 20 to 60 cm tall. The stem is surrounded by grass-like lanceolate basal leaves that are up to 30 long. The leaves die back as the rounded umbel of pink to purple flowers emerge at the end of the scape in late summer. The umbel is 5–8 cm across, and each of the flowers has 6 tepals that flare outward and are about 6 mm long. The stamens are exerted, and the pistil has 6 locules. The fruit is a capsule with usually 1 seed per locule. This species is commonly found on prairies and hillsides.

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  Liliaceae : Allium textile

  R. Neil Reese

  Allium textile is a perennial herb coming from an underground egg-shaped bulb that is up to 2.5 cm long. This onion is shorter than the other common onions growing in South Dakota, often having multiple stems coming from a single bulb which grow from 10 to 30 cm in height. The stems are often curved or twisted in appearance. The plant has 1 or 2 flat grass-like leaves that are (2) 1-3 mm wide, alternately attached near the base, sheathing the stem, and may appear to be basal. Allium textile has numerous flowers arranged in a compact umbel and bloom from May to June.. The tepals are white to rarely pink in color, 5-7 mm long. The stamens are not exerted from the tepals as with the other common onions of the region. The fruit is a capsule. This species is commonly found throughout the state in mixed grass prairies, sagebrush steppes, meadows, open pine forests, and clearings.

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  Liliaceae : Calochortus nuttallii

  R. Neil Reese

  Calochortus nuttallii is a perennial herb growing from a membranous coated bulb, 14-44 cm in height. The 2-4, simple, alternate leaves are linear, 8-16 cm long and 1-2 mm wide, reduced in length toward the top. The inflorescence is a single terminal flower {occasionally 2-3), white with a yellow base, the outer whorl of tepals (sepals) are lanceolate, 20-33 mm long and 4-8 mm wide. The inner 3 tepals are obovate with a narrow base, 30-45 mm long and 27-38 mm wide, with a round gland surrounded by a fringed membrane covered with simple and/or branched hairs. The 6 stamens have filaments 5-8 mm long and anthers 5-10 mm long. The fruit is a linear-lanceolate, dehiscent capsule, 3-5 cm long. Sego lilies bloom in June and July on dry prairies and open woods in western South Dakota.

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  Liliaceae : Hypoxis hirsuta

  R. Neil Reese

  Hypoxis hirsute is a perennial herb growing from a rounded, membranous coated corm. There is a rosette of 3-6 basal, linear leaves, 5-26 cm long and 2-12 mm wide, green with scattered white hairs. The plants produce one to several slender flowering stems (scapes), up to 20 cm tall, each with a 2-14 flowers in a terminal umbel. The flowers have 6 yellow tepals, 6-14 mm long and 2-6.5 mm wide, with hairs on the outer surfaces. There are 6 stamens, the filaments 2-3 mm long and the anthers 2-4 mm long. The ovary is inferior and hairy. The fruit is a hairy, ovoid capsule. Yellow stargrass blooms from April into July on prairies and in open deciduous woodlands in eastern South Dakota.

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  Liliaceae : Maianthemum racemosum

  R. Neil Reese

  Maianthemum racemosum is a perennial herb from a whitish rhizome with simple, erect stems growing 35-80 cm tall. The simple, alternate, lanceolate to elliptical leaves are 2-ranked, 6-15 cm long and 2-7 cm wide. The leaves are sessile or with a short petiole, have a rounded bases, a pointed tips, and entire margins, with prominent veins running the length of the leaves. The inflorescence is a many-flowered panicle. The flowers have 6, white tepals, 1-4 mm long and 6 stamens that are longer than the tepals. The fruit is a green to red to purple berry, 4-6 mm in diameter. False Solomon’s Seal blooms from April into July in moist woodlands and thickets in the eastern and western border counties of South Dakota.

  Synonym: Smilacina racemosa

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  Liliaceae : Maianthemum stellatum

  R. Neil Reese

  Maianthemum stellatum is a perennial herb from a whitish rhizome with simple, erect stems growing 15-65 cm tall. The simple, alternate, lanceolate to oblong leaves are 2-ranked, 4-16 cm long and 1-4 cm wide. The leaves are sessile, folded, have pointed tips, and entire margins, with a prominent central vein. The inflorescence is a raceme, sessile or with a short peduncle. The flowers have 6, creamy white to greenish white tepals, 4-7 mm long and 6 stamens are 2-5 mm long, shorter than the perianth. The fruit is a berry, 7-9 mm in diameter, initially light green with blue stripes and turns dark blue purple as it ages. Starry false Solomon’s Seal blooms in May and June in moist to dry woodlands, along streams and rivers throughout much of South Dakota.