Trifolium jokerstii
Trifolium stoloniferum
Butte County golden clover, Jim's clover
running buffalo clover
erect-ascending, simple or cespitose, branched or unbranched.
creeping, branched, rooting at nodes.
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.
palmate, opposite or subopposite on erect stems;
stipules lanceolate (on prostrate stems) or ovate (on erect stems), 1–2 cm, margins entire or shallowly serrate, apex acuminate;
petioles 6–15 cm on prostrate stems, 0.5–4 cm on erect stems;
petiolules 1 mm;
leaflets 3, blades broadly ovate or obcordate, 1–2 × 0.5–2.5 cm, base broadly cuneate to rounded, veins fine, margins serrate, apex emarginate or rounded, surfaces glabrous.
axillary or terminal, 10–30-flowered, subglobose, 1.2–3 × 1.2–3 cm;
involucres widely campanulate to nearly flat, 6–11 mm.
terminal, single or paired at tip of upright stem, 15–30-flowered, globose, 2–3.5 × 2–3.5 cm;
involucres absent.
2–15 cm.
2–7 cm.
straight, 0.5 mm;
bracteoles absent.
elongated and strongly reflexed in fruit, 2–5 mm;
bracteoles lanceolate, 2 mm.
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.
9–15 mm;
calyx campanulate, 4–7 mm, glabrous or sparsely pubescent, veins 10, tube 1.3–3.3 mm, lobes subequal, subulate, orifice open;
corolla white, veins often pinkish, 8–14 mm, banner ovate or oblong, 8–14 × 4–5 mm, apex rounded or emarginate.
stipitate, ovoid, 3.3–3.5 mm.
oblong, 2.5–3 mm.
1 or 2, dark brown, ellipsoid to mitten-shaped, 3.1–3.4 mm, rugose.
1 or 2, tan to brown, reniform, 1.3–2 mm, smooth.
= 16.
Trifolium jokerstii
Trifolium stoloniferum
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.)
Trifolium stoloniferum was thought to be extinct but was rediscovered in the early 1980s (R. L. Bartgis 1985). It is now known from extant populations scattered throughout much of its original range, in five of the original eight states in which it was found historically (D. J. Crawford et al. 1998); it was discovered in Greene County, Pennsylvania, in 2017, but appears to be extirpated in Arkansas, Illinois, and Kansas. R. J. Hickey et al. (1991) examined genetic diversity of T. stoloniferum populations using allozymes and found low diversity, with some populations appearing genetically uniform. Molecular studies using RAPDs (Crawford et al.) indicated somewhat higher genetic diversity, even in relatively small populations.
Trifolium stoloniferum is in the Center for Plant Conservation’s National Collection of Endangered Plants.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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