Trifolium douglasii |
Trifolium tomentosum |
|
---|---|---|
Douglas' clover |
woolly clover |
|
Habit | Herbs perennial, 20–75 cm, glabrous or slightly pilose. | Herbs annual, 10–20 cm, glabrous or sparsely hairy. |
Stems | erect, unbranched or sparsely branched. |
prostrate, ascending, or erect, 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. |
palmate; stipules ovate or triangular-lanceolate, 0.4–1.2 cm, margins entire, apex acute or acuminate; petiole 0.5–7 cm; petiolules to 1 mm; leaflets 3, blades obovate, obcordate, or elliptic, 0.4–1.5 × 0.3–1 cm, base cuneate, veins moderately prominent, margins denticulate, apex rounded or emarginate, surfaces sparsely hairy abaxially, glabrous adaxially. |
Inflorescences | terminal or axillary, 30–50+-flowered, umbellate, globose to ovoid, 1.5–5 × 2–3.5 cm; involucres absent. |
axillary, 10–20-flowered, subglobose, soon becoming globose, flowers resupinate, calyces densely white-woolly, compacted, inflated, 0.5–1.5 × 0.5–1.5 cm; involucres a narrow rim, 0.2 mm. |
Peduncles | 3–12 cm. |
0.5–1.5 cm. |
Pedicels | erect or slightly reflexed, to 0.2 mm; bracteoles minute. |
slightly reflexed, to 0.5 mm; bracteoles cup-shaped, membranous, 0.2 mm. |
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. |
3–7 mm; calyx tubular, inflated in fruit, markedly asymmetric-bilabiate, 2–6 mm, woolly adaxially, veins 5–10, connected by lateral veins, tube 1.5–2.5 mm, 4–5 mm in fruit, lobes unequal, subulate, shorter than tube, adaxial spreading or curved, orifice open, abruptly constricted in fruit; corolla pink, 3–6 mm, banner ovate, 3–6 × 3–6 mm, apex emarginate to crenulate. |
Legumes | ovoid, 3–4.5 mm. |
ovoid to globose, 2–3 mm. |
Seeds | 1 or 2, tan to brown, ovoid, 1–1.5 mm, slightly roughened. |
1 or 2, yellow to brown, mottled, mitten-shaped, 0.9–1.1 mm, smooth, glossy. |
2n | = 16. |
= 16. |
Trifolium douglasii |
Trifolium tomentosum |
|
Phenology | Flowering Jun–Jul. | Flowering Feb–Apr. |
Habitat | Moist meadows, rich soils in prairies, stream bottoms and banks, openings in pine forests. | Sandy lawns, fields, meadows, roadsides, clay soils among vernal pools. |
Elevation | 600–1500 m. (2000–4900 ft.) | 0–400 m. (0–1300 ft.) |
Distribution |
ID; OR; WA
|
CA; FL; MA; NC; SC; s Europe (Mediterranean); sw Asia; n Africa; Atlantic Islands (Azores) [Introduced in North America; introduced also in South America (Chile), s Africa, Pacific Islands (New Zealand), Australia]
|
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.) |
Trifolium tomentosum is occasionally cultivated as a forage crop (F. J. Hermann 1953) and is becoming weedy in the flora area and in Australia (R. P. Randall 2002). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Trifolium | Fabaceae > subfam. Faboideae > Trifolium |
Sibling taxa | ||
Synonyms | T. altissimum | |
Name authority | House: Bot. Gaz. 41: 335. (1906) | Linnaeus: Sp. Pl. 2: 771. (1753) |
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