Trifolium howellii |
Trifolium jokerstii |
|
---|---|---|
canyon clover, Howell's clover |
Butte County golden clover, Jim's clover |
|
Habit | Herbs perennial, 30–100 cm, glabrous. | Herbs annual, 5–20 cm, glabrous. |
Stems | erect, fistulose, unbranched or branched distally. |
erect-ascending, simple or cespitose, branched or unbranched. |
Leaves | palmate; stipules ovate, 1.5–4.5 cm, margins usually entire, sometimes lobed, apex acuminate; petiole 0.5–20 cm; petiolules 1–1.5 mm; leaflets 3, blades ovate, elliptic, or rhombic, 3.5–9.5 × 2.3–5 cm, base cuneate, veins obscure, margins ± serrate, apex acute, rounded, or obtuse, surfaces glabrous. |
palmate; stipules ovate-lanceolate, 0.8–2 cm, margins toothed, apex rounded to acute; petiole 1–9 cm; petiolules 0.5 mm; leaflets 3, blades elliptic to obovate, 0.5–3.2 × 0.4–1.5 cm, base cuneate, veins fine to slightly thickened, margins usually serrulate, rarely nearly lobed, teeth shortly aristate, apex usually acute or obtuse, rarely emarginate, surfaces glabrous. |
Inflorescences | terminal or axillary, 20–70-flowered, globose or ellipsoid, 2.5–4 × 2–2.5 cm, rachis prolonged beyond flowers, undivided or forked, often bearing sterile flower buds distally; involucres absent. |
axillary or terminal, 10–30-flowered, subglobose, 1.2–3 × 1.2–3 cm; involucres widely campanulate to nearly flat, 6–11 mm. |
Peduncles | 3–11 cm. |
2–15 cm. |
Pedicels | strongly reflexed in fruit, 1 mm; bracteoles minute, blunt or acute, membranous. |
straight, 0.5 mm; bracteoles absent. |
Flowers | 10–14 mm; calyx campanulate, gibbous, 4–5.5 mm, glabrous, veins 10, tube 2–2.5 mm, lobes subequal, linear-lanceolate, orifice open; corolla white, lemon yellow, or greenish yellow, 11–12 mm, banner elliptic-oblong, 11–12 × 4–5 mm, apex obtuse. |
10–16 mm; calyx campanulate, inflated in fruit, 7–9 mm, sparsely pubescent, veins 5, tube 3.5–4.5 mm, lobes unequal, abaxial and lateral 2- or 3-fid, adaxial unbranched, segments plumose, apex setaceous, orifice open; corolla yellow, 10–15 mm, banner broadly ovate, proximally inflated in fruit, distally narrowed into twisted tip, 10–15 × 3–5 mm, apex obtuse, truncate, or emarginate-apiculate. |
Legumes | oblong or clavate, 4–5 mm. |
stipitate, ovoid, 3.3–3.5 mm. |
Seeds | 1–3, reddish black or brown, angular, mitten-shaped, 2.5 mm, smooth or slightly roughened, dull. |
1 or 2, dark brown, ellipsoid to mitten-shaped, 3.1–3.4 mm, rugose. |
Trifolium howellii |
Trifolium jokerstii |
|
Phenology | Flowering Jun–Jul. | Flowering Mar–May. |
Habitat | Wet stream banks, wet meadows, flood plains, shady woodlands, springs, thickets. | Wet meadows, streamsides. |
Elevation | 800–2000 m. (2600–6600 ft.) | 300–400 m. (1000–1300 ft.) |
Distribution |
CA; OR
|
CA |
Discussion | Trifolium howellii is known from Del Norte, Humboldt, Siskiyou, and Trinity counties in California, and Clackamas, Douglas, Jackson, Josephine, Klamath, Lane, and Linn counties in Oregon (J. M. Gillett 1972). It has some of the largest leaves of any species of Trifolium in North America. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Trifolium jokerstii is known only from Butte County, from Table Mountain and along a stream adjacent to it (M. A. Vincent and R. Morgan 1998). (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 | ||
Name authority | S. Watson: Proc. Amer. Acad. Arts 23: 262. (1888) | Vincent & Rand. Morgan: Novon 8: 91, fig. 1. (1998) |
Web links |