Trifolium macrocephalum |
Trifolium incarnatum |
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big-head clover, large-head clover |
crimson clover, Italian clover |
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Habit | Herbs perennial, 5–25 cm, villous. | Herbs usually annual, rarely biennial, 20–60 cm, short-villous. |
Stems | erect or ascending, branched. |
erect, unbranched or sparsely 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. |
palmate; stipules ovate, 1–2 cm, margins wavy or toothed, apex blunt or ± tapering distally; petiole 1–8 cm; petiolules 1 mm; leaflets 3, blades broadly ovate, 1–3 × 1–1.5 cm, base cuneate, veins fine, margins denticulate, apex emarginate or retuse, surfaces with spreading, pustulate-based hairs. |
Inflorescences | terminal, 20–32-flowered, globose or ovoid-ellipsoid, 2.5–8 × 3–7 cm; involucres absent. |
terminal, 25–100-flowered, oblong, 2–7 × 1–2.5 cm; involucres absent. |
Peduncles | 2–8 cm. |
2–10 cm. |
Pedicels | erect, 1–1.5 mm; bracteoles broadly ovate, membranous, to 0.5 mm, truncate. |
straight, 0.5 mm; bracteoles absent. |
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. |
10–15 mm; calyx tubular-campanulate, 10 mm, villous, veins 10, tube 3–4 mm, lobes equal, longer than tube, spreading in fruit, orifice narrowly opening; corolla usually scarlet to red, rarely pink or white, 11–17 mm, banner oblong-elliptic, much longer than wing and keel petals, 10–16 × 2 mm, apex acute. |
Legumes | ovoid, 4–5 mm. |
ovoid, leathery distally, transversely dehiscent, 2.5–3 mm. |
Seeds | 1 or 2, yellow or reddish, mitten-shaped to ellipsoid, 2.5–3 mm, smooth. |
1, reddish, ellipsoid, 2–2.5 mm, smooth, glossy. |
2n | = 32, 48. |
= 14. |
Trifolium macrocephalum |
Trifolium incarnatum |
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Phenology | Flowering Apr–Jun. | Flowering May–Aug. |
Habitat | Rocky places, hard, compacted clay-gumbo, lava beds, sage-covered slopes, full sun. | Meadows, roadsides, especially in sandy soils. |
Elevation | 80–2500 m. [260–8200 ft.] | 0–1000 m. [0–3300 ft.] |
Distribution |
CA; ID; NV; OR; WA
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AL; AR; CA; CT; DC; DE; FL; GA; IA; ID; IL; IN; KS; KY; LA; MA; MD; ME; MI; MN; MO; MS; NC; ND; NE; NH; NJ; NM; NY; OH; OK; OR; PA; RI; SC; SD; TN; TX; VA; VT; WA; WI; WV; BC; Europe [Introduced in North America; introduced also in s South America (Chile), e Asia (e China), s Africa, Pacific Islands (Hawaii, New Zealand), Australia]
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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.) |
Trifolium incarnatum was introduced to the United States in 1818 as a forage crop and green manure crop; it is used commonly as a winter grazing crop and in roadside grass plantings as a nitrogen source, especially in the southeastern states (W. E. Knight 1985). Reports of T. incarnatum in Manitoba, Ontario, and Montana appear to have been based on cultivated specimens. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | ||
Sibling taxa | ||
Synonyms | Lupinaster macrocephalum | |
Name authority | (Pursh) Poiret in J. Lamarck et al.: Encycl., suppl. 5: 336. (1817) | Linnaeus: Sp. Pl. 2: 769. (1753) |
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