Trifolium willdenovii |
Trifolium barnebyi |
|
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sand clover, thimble clover, tomcat clover, Willdenow's clover |
Barneby's clover |
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Habit | Herbs annual, 10–60 cm, glabrous. | Herbs perennial, 3–5 cm, mostly glabrous. |
Stems | erect, branched. |
densely mat-forming, short-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, 0.5–1 cm, margins entire or lobed, apex acute or acuminate; petiole 0.3–30 cm, pubescent; petiolules 0.2 mm; leaflets 3, blades oblanceolate, 0.3–1.6 × 0.1–0.7 cm, base cuneate, veins close-set, 12–18 pairs of primary veins, 0.5 mm apart, margins sharply antrorsely serrate, apex acute, long-apiculate, surfaces usually glabrous, rarely midvein pubescent abaxially. |
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, 8–18-flowered, globose or subglobose, 1.2–2.5 × 2–3 cm; involucres absent. |
Peduncles | 2–15 cm. |
0.5–3.5 cm, pubescent. |
Pedicels | erect, 0.5 mm; bracteoles absent. |
reflexed, 2–3.5 mm, pubescent; bracteoles broad, membranous, to 0.2 mm. |
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. |
8–13 mm; calyx campanulate, 4–6 mm, pubescent, veins 5–10, tube 1.5–2.5 mm, lobes subequal, narrowly triangular-subulate, orifice open; corolla creamy white, 8–13 mm, banner broadly elliptic-oblong, 10–13 × 6–8 mm, apex rounded, slightly apiculate. |
Legumes | ellipsoid, 3 mm. |
stipitate, flattened, ovoid, 2–3.5 mm. |
Seeds | 1 or 2, yellow, mottled, globose-ellipsoid, 1.5–2.5 mm, smooth. |
1, yellow, mottled, flattened-ovoid, 2 mm, smooth. |
2n | = 16. |
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Trifolium willdenovii |
Trifolium barnebyi |
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Phenology | Flowering Mar–Jul. | Flowering Jun. |
Habitat | Roadsides, meadows, lawns, hillsides, stream margins, open oak chaparral. | Sandstone ledges and outcrops. |
Elevation | 0–2500 m. (0–8200 ft.) | 1700–2100 m. (5600–6900 ft.) |
Distribution |
AZ; CA; ID; OR; WA; BC; Mexico (Baja California)
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WY |
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 barnebyi is known from central Wyoming. It was originally described as a variety of T. haydenii, but was elevated to species rank based on its pubescent petioles, pedicels, and peduncles, closely spaced leaflet veins, and more elongate leaflets that are two times as long as wide. (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. haydenii var. barnebyi |
Name authority | Sprengel: Syst. Veg. 3: 208. (1826) | (Isely) Dorn & Lichvar: Madroño 28: 189. (1981) |
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