Trifolium douglasii |
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Douglas' clover |
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Habit | Herbs perennial, 20–75 cm, glabrous or slightly pilose. |
Stems | erect, unbranched or sparsely branched. |
Leaves | palmate; stipules lanceolate to ovate, 1.5–6.5 cm, margins setose-serrulate or entire, apex acuminate; petiole 1.5–15 cm; petiolules 1 mm; leaflets 3, blades elliptic-oblanceolate to linear-elliptic, 3–9.5 × 0.5–1.6 cm, base cuneate, lateral veins prominent, recurved, dichotomously forked near margin, margins setose-denticulate to serrate, apex rounded or acute, surfaces glaucous, glabrous, sometimes sparsely pubescent abaxially. |
Inflorescences | terminal or axillary, 30–50+-flowered, umbellate, globose to ovoid, 1.5–5 × 2–3.5 cm; involucres absent. |
Peduncles | 3–12 cm. |
Pedicels | erect or slightly reflexed, to 0.2 mm; bracteoles minute. |
Flowers | 14–16 mm; calyx campanulate, 6–9 mm, pilose, veins 15–20, tube 1.5–3 mm, lobes unequal, narrow, triangular or subulate, abaxial lobe straight, lateral and adaxial tortuous, recurved inwards around corolla, orifice open; corolla magenta, 12–16 mm, banner oblong, 12–16 × 4–6 mm, apex flared, acute or obtuse; ovaries glabrous or pubescent distally. |
Legumes | ovoid, 3–4.5 mm. |
Seeds | 1 or 2, tan to brown, ovoid, 1–1.5 mm, slightly roughened. |
2n | = 16. |
Trifolium douglasii |
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Phenology | Flowering Jun–Jul. |
Habitat | Moist meadows, rich soils in prairies, stream bottoms and banks, openings in pine forests. |
Elevation | 600–1500 m. (2000–4900 ft.) |
Distribution |
ID; OR; WA
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Discussion | Trifolium douglasii is rare throughout its range and has been impacted by agricultural practices (P. Camp et al. 2011). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Trifolium |
Sibling taxa | |
Synonyms | T. altissimum |
Name authority | House: Bot. Gaz. 41: 335. (1906) |
Web links |