Trifolium tomentosum |
Trifolium microdon |
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woolly clover |
thimble clover, Valparaiso clover |
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Habit | Herbs annual, 10–20 cm, glabrous or sparsely hairy. | Herbs annual, 6–35 cm, villous or glabrous. |
Stems | prostrate, ascending, or erect, branched. |
erect or ascending, branched. |
Leaves | 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. |
palmate; stipules obliquely ovate, 0.4–1.2 cm, margins entire, toothed, or lacerate, apex acuminate; petiole 1–8 cm; petiolules 0.5 mm; leaflets 3, blades obovate or obcordate, 0.4–1.4 × 0.3–1.2 cm, base cuneate, veins fine, thickened distally, margins serrate, apex rounded or emarginate, surfaces villous or glabrous. |
Inflorescences | 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. |
axillary or terminal, 10–17-flowered, subglobose, 0.8–1.7 × 0.5–1.5 cm; involucres cup-shaped, 0.5–1.5 cm, glabrous or sparsely hairy, lobes 8–12, ovate, conspicuously sharply toothed. |
Peduncles | 0.5–1.5 cm. |
1.5–7.4 cm. |
Pedicels | slightly reflexed, to 0.5 mm; bracteoles cup-shaped, membranous, 0.2 mm. |
absent; bracteoles absent. |
Flowers | 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. |
6–7 mm; calyx tubular-campanulate, 3–4 mm, glabrous, veins 10, tube 2.5–3.5 mm, lobes ± equal, triangular, not or minutely aristate, conspicuously toothed, margins membranous, orifice open; corolla pale pink or white, 6–9 mm, banner oblong, 6–9 × 2–3 mm, apex narrowly rounded or emarginate-mucronate. |
Legumes | ovoid to globose, 2–3 mm. |
ovoid, 2–3 mm. |
Seeds | 1 or 2, yellow to brown, mottled, mitten-shaped, 0.9–1.1 mm, smooth, glossy. |
1 or 2, greenish, sometimes mottled, oblong, 1.5–2 mm, smooth. |
2n | = 16. |
= 16. |
Trifolium tomentosum |
Trifolium microdon |
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Phenology | Flowering Feb–Apr. | Flowering Apr–Jul. |
Habitat | Sandy lawns, fields, meadows, roadsides, clay soils among vernal pools. | Meadows, roadsides, dry slopes, fields, open oak or pine forests. |
Elevation | 0–400 m. (0–1300 ft.) | 0–1500 m. (0–4900 ft.) |
Distribution |
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]
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CA; ID; OR; WA; BC; Mexico (Baja California); South America (Chile)
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Discussion | 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.) |
Trifolium microdon is one of several clovers 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. In herbarium specimens of Trifolium microdon, the folded involucre hides, or nearly hides, the calyces, whereas in herbarium specimens of similar T. microcephalum, the calyces are still visible. (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. microdon var. pilosum | |
Name authority | Linnaeus: Sp. Pl. 2: 771. (1753) | Hooker & Arnott: Bot. Misc. 3: 180. (1833) |
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