Trifolium tomentosum |
Trifolium microdon |
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woolly clover |
thimble clover |
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Habit | Plants annual, erect or ascending, 6–35 cm, villous or glabrous; branched. | |
Leaves | palmate; leaflets 3, obovate or obcordate, 4–14 × 3–12 mm, bases cuneate; margins serrate; veins fine, thickened distally; tips rounded or emarginate; surfaces villous or glabrous; petioles 10–80 mm; petiolules ~0.5 mm; stipules obliquely ovate, 4–12 mm; margins entire, toothed, or lacerate; tips acuminate. |
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Inflorescences | axillary or terminal, 10–17-flowered, subglobose, 8–17 × 5–15 mm; involucres cup-shaped; bracts ± connate, 5–15 mm, glabrous or inconspicuously hairy; lobes 8–12; ovate, conspicuously sharply toothed; bracteoles absent. |
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Peduncles | 15–74 mm. |
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Pedicels | absent. |
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Flowers | 6–7 mm; calyces tubular-campanulate, 3–4 mm, glabrous; veins 10; tubes 2.5–3.5 mm; lobes triangular; ± equal, not or minutely aristate, conspicuously toothed; margins membranous; orifices open; corollas 6–9 mm, pale pink or white; banners oblong, 6–9 × 2–3 mm; tips narrowly rounded or emarginate-mucronate. |
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Fruits | ovoid, 2–3 mm. |
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Seeds | 1–2, oblong, 1.5–2 mm; greenish, sometimes mottled; smooth. |
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2n | =16. |
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Trifolium tomentosum |
Trifolium microdon |
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Distribution | ||
Discussion | Meadows, roadsides, dry slopes, fields, open oak or pine forests. Flowering Apr–Jul. 0–1000 m. CR, Est, Sisk, WV. CA, ID, WA; north to British Columbia, south to Mexico; South America. Native. Trifolium microdon is one of several taxa in the genus that have an apparently natural disjunct distribution between the western coast of South America (Chile) and western North America. Others include T. depauperatum var. depauperatum and T. macraei. |
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Source | Flora of Oregon, volume 2, page 735 Michael Vincent |
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Sibling taxa | ||
Web links |
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