Stylosanthes biflora |
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endbeak pencilflower, pencil-flower, sidebeak pencilflower |
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Stems | herbaceous, erect or spreading, much branched, to 6 dm, glabrous, puberulent, or densely hispid. |
Leaves | stipular sheath 8–15-veined, glabrous or puberulent to densely hispid, teeth of distal stipules mostly shorter than sheath; petiole 1–3 mm; leaflet blades ovate to elliptic or lanceolate, 40–20 mm, veins 3–6 pairs, base cuneate, margins sometimes spinulose, apex acute to acuminate, surfaces sometimes punctate abaxially, glabrous. |
Inflorescences | 1–8-flowered, ovoid, to 1 cm, axis rudiment absent; bracts usually 1-foliolate, sometimes 3-foliolate proximally, 3–6 × 2.5–5.5 mm, 5–9-veined, puberulent to densely hispid; outer bracteole 2–3 mm, apex glabrous or ciliate; inner bracteole 1, 1–2.5 mm, apex glabrous or ciliate. |
Flowers | calyx tube 2.5–5 mm, lobes ± acute; corolla yellow or orange-yellow; banner suborbiculate, 4.5–7 mm; wings 3.5–4.5 mm; keel 3–4 mm. |
Seeds | 1–1.5 mm. |
Loments | strongly reticulate with vertical veins, 2.5–3 mm wide; fertile segment 1; proximal segment sterile; distal segment 2.5–5 mm, puberulent; beak hooked, 0.5–1 mm, to 1/5 distal segment. |
Stylosanthes biflora |
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Phenology | Flowering summer. |
Habitat | Dry, open, rocky or sandy woodlands, borders, barrens, moist pine savannas, old fields, roadsides. |
Elevation | 0–1000 m. (0–3300 ft.) |
Distribution |
AL; AR; AZ; DC; DE; FL; GA; IL; IN; KS; KY; LA; MD; MO; MS; NC; NJ; NY; OH; OK; PA; SC; TN; TX; VA; WI; WV; Mexico
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Source | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Stylosanthes |
Sibling taxa | |
Synonyms | Trifolium biflorum, S. floridana, S. riparia |
Name authority | (Linnaeus) Britton: Sterns & Poggenburg, Prelim. Cat., 13. (1888) |
Web links |