Trifolium ciliolatum |
Trifolium microdon |
|
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foothill clover, tree clover |
thimble clover, Valparaiso clover |
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Habit | Herbs annual, 5–50 cm, glabrous or sparsely hairy. | Herbs annual, 6–35 cm, villous or glabrous. |
Stems | erect, branched. |
erect or ascending, branched. |
Leaves | palmate; stipules ovate-lanceolate, 1–1.5 cm, margins entire, sometimes ciliate, apex acuminate; petiole 1–13 cm; petiolules 0.5 mm; leaflets 3, blades elliptic to oblong or obovate, 0.8–3.5 × 0.5–1.5 cm, base cuneate, veins thickened, margins serrate proximally, obscurely denticulate distally, apex usually rounded or retuse, rarely acute, surfaces glabrous. |
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 or terminal, 10–30-flowered, ovoid to subglobose, 0.7–2.2 × 0.5–2 cm; involucres a narrow rim, 0.5 mm, membranous, dentate. |
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 | 2.5–12 cm. |
1.5–7.4 cm. |
Pedicels | erect becoming reflexed, 0.5–6 mm; bracteoles linear or cup-shaped, to 1 mm. |
absent; bracteoles absent. |
Flowers | 6–13 mm; calyx broadly campanulate, 5–11 mm, glabrous, veins 10, tube 1–5 mm, lobes unequal, elliptic to linear, margins hyaline, dentate or pectinate, ciliate, sinuses narrow, orifice open; corolla white, pink, or purple, 5–13 mm, banner broadly ovate, 6–13 × 4–7 mm, apex rounded, apiculate. |
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 | short-stipitate, ovoid, 5–10 mm. |
ovoid, 2–3 mm. |
Seeds | 1 or 2, brown, mottled, ovoid, 2.5–3 mm, smooth. |
1 or 2, greenish, sometimes mottled, oblong, 1.5–2 mm, smooth. |
2n | = 16. |
= 16. |
Trifolium ciliolatum |
Trifolium microdon |
|
Phenology | Flowering Apr–Jun. | Flowering Apr–Jul. |
Habitat | Oak-pine chaparral, meadows, roadsides. | Meadows, roadsides, dry slopes, fields, open oak or pine forests. |
Elevation | 0–1500 m. (0–4900 ft.) | 0–1500 m. (0–4900 ft.) |
Distribution |
CA; OR; WA; Mexico (Baja California)
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CA; ID; OR; WA; BC; Mexico (Baja California); South America (Chile)
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Discussion | Trifolium ciliolatum is relatively widespread in California and is found in scattered sites in Baja California, Oregon, and Washington. Trifolium ciliatum Nuttall (1848), which pertains here, is a later homonym of T. ciliatum E. D. Clarke (1813). (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. ciliatum var. discolor | T. microdon var. pilosum |
Name authority | Bentham: Pl. Hartw., 304. (1849) | Hooker & Arnott: Bot. Misc. 3: 180. (1833) |
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