Trifolium willdenovii |
Trifolium bolanderi |
|
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sand clover, thimble clover, tomcat clover, Willdenow's clover |
Bolander's clover, parasol clover |
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Habit | Herbs annual, 10–60 cm, glabrous. | Herbs perennial, 15–30 cm, glabrous. |
Stems | erect, branched. |
ascending, cespitose, branched. |
Leaves | palmate; stipules lanceolate or ovate, 1–2 cm, margins dentate or lacerate, apex acuminate; petiole 1–8 cm; petiolules 0.5 mm; leaflets 3, blades linear, lanceolate, or elliptic, 1–5 × 0.2–1.5 cm, base cuneate, veins fine, margins serrate, apex acute, blunt, or retuse, surfaces glabrous. |
palmate; stipules ovate or lanceolate, 0.6–1.5 cm, margins entire, apex acute; petiole 1–7 cm; petiolules to 1 mm; leaflets 3, blades obcordate, obovate, or elliptic, 1–1.9 × 0.5–1.1 cm, base cuneate, veins fine to slightly thickened, margins setose, apex obtuse, rounded, or emarginate, apiculate, surfaces glabrous. |
Inflorescences | axillary or terminal, 10–50-flowered, globose or ovoid, 1–3.5 × 1–3 cm; involucres flattened or bowl-shaped, 3–9 mm, when folded, not hiding flowers except proximally, incised 1/4–1/3 their length. |
terminal, 12–30-flowered, ovoid, 1–2 × 1.5–3 cm, rachis prolonged beyond flowers, undivided or forked, often bearing sterile flower buds distally; involucres absent. |
Peduncles | 2–15 cm. |
slender, bent distally, just below flowers, 5–20 cm. |
Pedicels | erect, 0.5 mm; bracteoles absent. |
strongly reflexed, 1–1.2 mm; bracteoles minute, cuplike. |
Flowers | 12–20 mm; calyx tubular-campanulate, slit between adaxial lobes, 6–9 mm, glabrous, veins 10–15, tube 3–7 mm, lobes unequal, triangular or subulate, usually 3-fid or shouldered below apex, orifice open; corolla usually white with purple spot, sometimes lavender or pink or all white, 10–18 mm, banner narrowly oblong, 12–20 × 3–4 mm, apex obtuse or retuse. |
12–14 mm; calyx deep violet, campanulate, gibbous, 3–5 mm, glabrous, veins 5, tube 1.5–2 mm, lobes unequal, triangular-subulate, orifice open; corolla lavender to purplish, 11–12 mm, banner curved, oblanceolate, 10–12 × 3–4 mm, apex narrow, rounded, slightly emarginate. |
Legumes | ellipsoid, 3 mm. |
ellipsoid, 3–4 mm. |
Seeds | 1 or 2, yellow, mottled, globose-ellipsoid, 1.5–2.5 mm, smooth. |
1 or 2, brown, ellipsoid, 1.2–1.5 mm, smooth. |
2n | = 16. |
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Trifolium willdenovii |
Trifolium bolanderi |
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Phenology | Flowering Mar–Jul. | Flowering Jun–Aug. |
Habitat | Roadsides, meadows, lawns, hillsides, stream margins, open oak chaparral. | Meadows. |
Elevation | 0–2500 m. (0–8200 ft.) | 2000–2300 m. (6600–7500 ft.) |
Distribution |
AZ; CA; ID; OR; WA; BC; Mexico (Baja California)
|
CA |
Discussion | Trifolium willdenovii was described by M. Zohary and D. Heller (1984) as one of the most variable clover species in North America. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Trifolium bolanderi is known from the Sierra Nevada in California and may be vulnerable to shifts in climate patterns. Genetic diversity of populations of the species (based on allozyme patterns) was found to be relatively high; two genetically distinct groups of populations are known (R. G. Denton 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. involucratum, T. aciculare, T. nuttallii, T. scabrellum, T. segetum, T. tridentatum, T. tridentatum var. aciculare, T. tridentatum var. scabrellum, T. tridentatum var. segetum, T. tridentatum var. watsonii, T. trimorphum, T. watsonii | |
Name authority | Sprengel: Syst. Veg. 3: 208. (1826) | A. Gray: Proc. Amer. Acad. Arts 7: 335. (1868) |
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