Trifolium macrocephalum |
Trifolium dedeckerae |
|
---|---|---|
big-head clover, large-head clover |
Dedecker's clover |
|
Habit | Herbs perennial, 5–25 cm, villous. | Herbs perennial, 20–25 cm, glabrous. |
Stems | erect or ascending, branched. |
± erect, loosely cespitose, branched. |
Leaves | palmate; stipules ovate, obovate, or oblong, 1–3 cm, margins entire, irregularly lobed, or serrate, apex acute or acuminate; petiole 1–14 cm; petiolules 0.9–1.2 mm; leaflets (5–)7–9, blades broadly to narrowly obovate, often folded, 1–2.7 × 0.4–1.1 cm, base cuneate, veins thickened, especially distally, margins serrulate, apex rounded or truncate, apiculate, surfaces villous abaxially, sparsely villous to glabrate adaxially. |
basal and cauline, palmate; stipules ovate, 1.1–1.5 cm, margins entire, apex acuminate-subulate; petiole 5–15 cm; petiolules absent; leaflets 3, blades lanceolate to linear, 2–4 × 0.1–0.6 cm, base cuneate, veins prominent, margins remotely serrate, apex acute, surfaces glabrous. |
Inflorescences | terminal, 20–32-flowered, globose or ovoid-ellipsoid, 2.5–8 × 3–7 cm; involucres absent. |
terminal or axillary, 10–18-flowered, ellipsoid to subglobose, 1.8–2.2 × 2.3–2.5 cm, rachis prolonged beyond flowers, undivided or forked, often bearing sterile flower buds distally; involucres absent. |
Peduncles | 2–8 cm. |
7–16 cm, slightly twisted apically. |
Pedicels | erect, 1–1.5 mm; bracteoles broadly ovate, membranous, to 0.5 mm, truncate. |
strongly reflexed in fruit, 0.5 mm; bracteoles minute. |
Flowers | 20–30 mm; calyx campanulate, 10–22 mm, villous, veins 10–15, tube 2.5–4 mm, lobes subequal, subulate, plumose, orifice open; corolla white, creamy white, or pinkish, keel petals deep pink, 20–28 mm, banner ovate or oblong, 20–28 × 10–13 mm, apex rounded or slightly emarginate. |
13–15 mm; calyx tubular-campanulate, 6–8.5 mm, glabrous, veins 10, tube 2–2.5 mm, lobes unequal, triangular-subulate, orifice open; corolla pink to purple, 15 mm, banner oblong, 14–16 × 6–7 mm, apex acute or apiculate. |
Legumes | ovoid, 4–5 mm. |
ellipsoid, 5 mm. |
Seeds | 1 or 2, yellow or reddish, mitten-shaped to ellipsoid, 2.5–3 mm, smooth. |
1 or 2, brown, flattened ovoid, 2 mm, smooth. |
2n | = 32, 48. |
|
Trifolium macrocephalum |
Trifolium dedeckerae |
|
Phenology | Flowering Apr–Jun. | Flowering May–Jun. |
Habitat | Rocky places, hard, compacted clay-gumbo, lava beds, sage-covered slopes, full sun. | Rock crevices, dry slopes. |
Elevation | 80–2500 m. [260–8200 ft.] | 2100–3400 m. [6900–11200 ft.] |
Distribution |
CA; ID; NV; OR; WA
|
CA |
Discussion | Trifolium macrocephalum has the largest inflorescences of any clover. Trifolium megacephalum Nuttall (1818) is an illegitimate replacement name for Lupinaster macrocephalum Pursh. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Trifolium dedeckerae is known from Inyo, Kern, Mono, and Tulare counties. It is similar to T. macilentum and T. productum, from which it differs by its much narrower leaflets (J. M. Gillett 1972). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Lupinaster macrocephalum | T. kingii subsp. dedeckerae, T. macilentum var. dedeckerae |
Name authority | (Pursh) Poiret in J. Lamarck et al.: Encycl., suppl. 5: 336. (1817) | J. M. Gillett: Madroño 21: 451, fig. 1. (1972) |
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