Trifolium willdenovii |
Trifolium rollinsii |
|
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sand clover, thimble clover, tomcat clover, Willdenow's clover |
Rollins' clover |
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Habit | Herbs annual, 10–60 cm, glabrous. | Herbs perennial, 5–20 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. |
mostly basal, palmate; stipules ovate, 1 cm, margins entire, apex blunt; petiole 2–6 cm; petiolules to 1 mm; leaflets 3, blades obovate or rhombic, 0.6–1.3 × 0.6–1 cm, base cuneate, veins prominent, margins denticulate, apex rounded or retuse, apiculate, surfaces pale abaxially, 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 or axillary, 8–15-flowered, appearing turned to one side, obconic, 1.3–1.8 × 1.1–2.5 cm, rachis prolonged beyond flowers, undivided or forked, often bearing sterile flower buds distally; involucres absent. |
Peduncles | 2–15 cm. |
curved distally proximal to flowers, 3–9 cm. |
Pedicels | erect, 0.5 mm; bracteoles absent. |
reflexed, 1–1.2 mm; bracteoles minute. |
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. |
10–13 mm; calyx purple, campanulate, 5–6 mm, glabrous, veins 10, tube 3.5 mm, lobes equal, subulate, 2 mm, orifice open; corolla purple, often with white tips, 15 mm, banner obovate, 11–13 × 5–6 mm, apex flared. |
Legumes | ellipsoid, 3 mm. |
not seen. |
Seeds | 1 or 2, yellow, mottled, globose-ellipsoid, 1.5–2.5 mm, smooth. |
not seen. |
2n | = 16. |
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Trifolium willdenovii |
Trifolium rollinsii |
|
Phenology | Flowering Mar–Jul. | Flowering Jun–Aug. |
Habitat | Roadsides, meadows, lawns, hillsides, stream margins, open oak chaparral. | Wind-swept alpine areas. |
Elevation | 0–2500 m. (0–8200 ft.) | 3000–3100 m. (9800–10200 ft.) |
Distribution |
AZ; CA; ID; OR; WA; BC; Mexico (Baja California)
|
NV |
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 rollinsii is known from the Toiyabe Range in Lander and Nye counties in central Nevada. (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 | T. kingii subsp. rollinsii, T. macilentum var. rollinsii |
Name authority | Sprengel: Syst. Veg. 3: 208. (1826) | J. M. Gillett: Madroño 21: 453, fig. 2. (1972) |
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