Desmodium cuspidatum |
Desmodium illinoense |
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large-bract tick-trefoil |
Illinois tickclover, Illinois ticktrefoil |
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Habit | Herbs, perennial. | Herbs, perennial. |
Stems | erect or ascending, usually striate, 50–150 cm, usually glabrous, sometimes sparsely uncinate-pubescent or pilose. |
ascending to erect, branched or unbranched, 50–100 cm, medially uncinate-pubescent, sometimes also ± pilose. |
Leaves | trifoliolate; stipules usually persistent, narrowly ovate or subulate, 10–20 mm; petiole 40–70 mm; leaflet blades ovate to broadly ovate, apex sharply acuminate to shortly cuspidate, surfaces glabrous (except veins spreading-villosulous); terminal blade 50–120 × 30–70 mm, length 1.5–3 times width. |
trifoliolate; stipules persistent, ovate, 8–15 mm, base amplexicaul, pilose-ciliate; petiole 30–50 mm; leaflet blades narrowly ovate to ovate, thick, papery, apex acute to rounded, surfaces conspicuously reticulate-veined abaxially, uncinate-puberulent on veins abaxially, sparsely spreading-villous or glabrous adaxially; terminal blade 35–80 × 30–70 mm, length 1.5–3 times width. |
Inflorescences | branched; rachis densely uncinate-pubescent to rarely glabrescent; primary bracts conspicuously covering apex of inflorescences, narrowly ovate, 8–14 mm. |
usually unbranched; rachis patent-pilose and uncinate-puberulent; primary bracts narrowly ovate, 4–5 mm. |
Pedicels | 4–8 mm, densely patent uncinate-puberulent and sparsely pilose. |
7–15(–23) mm. |
Flowers | calyx 3–4 mm, glabrate, margins sparsely ciliate, lobes pilose, tube 1.5–2 mm; abaxial lobes 3–4 mm, lateral lobes 2–3 mm; corolla purple, 8–12 mm. |
calyx 4–5 mm, uncinate-puberulent and pilose, tube 2–3 mm; abaxial lobes 2.5 mm, lateral lobes 2 mm; corolla purplish, 6–8 mm. |
Loments | sutures dentate abaxially, sinuate adaxially; connections adaxial, 1/2 as broad as segments; segments (1–)4–7, obliquely narrow-rhombic or suborbiculate, (7–)9–11 × 4–5 mm, angled abaxially, slightly convex adaxially, sparsely uncinate-puberulent, sutures densely uncinate-puberulent; stipe 1–2.5 mm. |
sutures equally crenate; connections central, 1/2–4/5 as broad as segments; segments 4–7, elliptic or suborbiculate, 4–7 × 3.5–5 mm, symmetrically convex abaxially and adaxially, densely uncinate-puberulent and villous; stipe 2–4 mm. |
Desmodium cuspidatum |
Desmodium illinoense |
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Phenology | Flowering summer–fall. | Flowering summer(–fall). |
Habitat | Rich, moist woodlands, thickets, openings, dry, rocky woodlands, ruderal areas. | Prairie relics, thickets, roadsides. |
Elevation | 0–1000 m. (0–3300 ft.) | 100–500 m. (300–1600 ft.) |
Distribution |
AL; AR; CT; DC; DE; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; MI; MN; MO; MS; NC; NE; NH; NJ; NY; OH; OK; PA; RI; SC; TN; TX; VA; VT; WI; WV; ON
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AR; IA; IL; IN; KS; MI; MN; MO; NE; OH; OK; SD; TX; WI
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Discussion | In Texas, Desmodium cuspidatum is known only from Bowie County, at the northeastern corner of the state. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Desmodium illinoense is considered extirpated from Ontario, where it was collected once in 1888 near London. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Desmodium | Fabaceae > subfam. Faboideae > Desmodium |
Sibling taxa | ||
Synonyms | Hedysarum cuspidatum, D. bracteosum, D. cuspidatum var. longifolium, D. grandiflorum, Meibomia grandiflora, M. longifolia | Meibomia illinoensis |
Name authority | (Muhlenberg ex Willdenow) de Candolle ex G. Don in J. C. Loudon: Hort. Brit., 309. (1830) | A. Gray: Proc. Amer. Acad. Arts 8: 289. (1870) |
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