Herbs annual, 5–20 cm, gla­brous. Stems erect-ascending, simple or cespitose, branched or unbranched. Leaves 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. Peduncles 2–15 cm. Inflorescences axillary or terminal, 10–30-flowered, subglobose, 1.2–3 × 1.2–3 cm; involucres widely cam­panulate to nearly flat, 6–11 mm. Pedicels straight, 0.5 mm; bracteoles absent. Flowers 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 stipitate, ovoid, 3.3–3.5 mm. Seeds 1 or 2, dark brown, ellipsoid to mitten-shaped, 3.1–3.4 mm, rugose.

Phenology: Flowering Mar–May.
Habitat: Wet meadows, streamsides.
Elevation: 300–400 m.

Distribution

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Calif.

Discussion

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).

Selected References

None.

Lower Taxa

None.