Trifolium macrocephalum |
Trifolium andersonii |
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big-head clover, large-head clover |
Anderson's clover, fiveleaf clover |
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Habit | Herbs perennial, 5–25 cm, villous. | Herbs perennial, 5–12 cm, canescent. | ||||||||
Stems | erect or ascending, branched. |
erect-ascending, cespitose, mat-forming, branched; from deep taproot-like crown. |
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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. |
palmate; stipules ovate or lanceolate, 0.5–1.5 cm, margins entire, apex long-acuminate; petiole 1–5 cm; petiolules to 0.5 mm; leaflets (3–)5, blades obovate, 0.5–2.2 × 0.2–1.2 cm, base cuneate, veins obscured by pubescence, margins entire, apex rounded or acute, apiculate, surfaces canescent. |
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Inflorescences | terminal, 20–32-flowered, globose or ovoid-ellipsoid, 2.5–8 × 3–7 cm; involucres absent. |
axillary, 10–20-flowered, depressed-globose, 1–2 × 1–2.3 cm; involucres formed of connate, narrow, membranous bracts, to 0.5 mm. |
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Peduncles | 2–8 cm. |
1–14 cm. |
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Pedicels | erect, 1–1.5 mm; bracteoles broadly ovate, membranous, to 0.5 mm, truncate. |
absent; bracteoles absent. |
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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. |
10–17 mm; calyx campanulate, 9–11 mm, pilose, veins 10, tube 4–5 mm, lobes equal, subulate, plumose, orifice open; corolla white or pink, 10–17 mm, banner ovate-oblong, 12–19 × 3–5 mm, apex rounded, retuse. |
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Legumes | ovoid, 4–5 mm. |
ellipsoid, 4–5 mm. |
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Seeds | 1 or 2, yellow or reddish, mitten-shaped to ellipsoid, 2.5–3 mm, smooth. |
1 (or 2), tan or brown, irregularly ovoid, 1.6–2 mm, smooth, glossy. |
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2n | = 32, 48. |
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Trifolium macrocephalum |
Trifolium andersonii |
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Phenology | Flowering Apr–Jun. | |||||||||
Habitat | Rocky places, hard, compacted clay-gumbo, lava beds, sage-covered slopes, full sun. | |||||||||
Elevation | 80–2500 m. [260–8200 ft.] | |||||||||
Distribution |
CA; ID; NV; OR; WA
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w United States
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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.) |
Subspecies 3 (3 in the flora). Trifolium andersonii encompasses three moderately well separable subspecies, with subsp. andersonii the more northern form in the range of the species, subsp. monoense in the southwestern portion of the range, and subsp. beatleyae in the eastern portion of the range (J. M. Gillett 1972). Intermediates between the latter two (and overlap in their ranges) make differentiation between them somewhat problematic, which prompted R. C. Barneby (1989) to combine them as var. beatleyae. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 11. | FNA vol. 11. | ||||||||
Parent taxa | ||||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | Lupinaster macrocephalum | |||||||||
Name authority | (Pursh) Poiret in J. Lamarck et al.: Encycl., suppl. 5: 336. (1817) | A. Gray: Proc. Amer. Acad. Arts 6: 522. (1865) | ||||||||
Web links |