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big-head clover, large-head clover

Persian clover, reversed clover

Habit Herbs perennial, 5–25 cm, villous. Herbs annual, 20–60 cm, glabrous or glabrescent.
Stems

erect or ascending, branched.

ascending, erect, or procumbent, 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 lanceolate or ovate, 0.5–1.8 cm, margins entire, apex acuminate-filiform;

petiole 0.5–20 cm;

petiolules to 1 mm;

leaflets 3, blades obovate, ovate, elliptic, or rhombic, 1–3 × 0.5–3 cm, base cuneate, veins moderately prominent, margins spinulose-dentate, apex rounded or broadly acute, surfaces hairy abaxially, glabrous adaxially.

Inflorescences

terminal, 20–32-flowered, globose or ovoid-ellipsoid, 2.5–8 × 3–7 cm;

involucres absent.

axillary, 15–30-flowered, subglobose to globose, flowers resupinate, forming stellate-spreading clusters in fruit, 0.5–1.6 × 0.8–1.5 cm;

involucres a narrow rim, 0.2 mm.

Peduncles

2–8 cm.

1–6 cm.

Pedicels

erect, 1–1.5 mm;

bracteoles broadly ovate, membranous, to 0.5 mm, truncate.

slightly reflexed, to 0.5 mm;

bracteoles minute or 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.

5–6 mm;

calyx tubular-campanulate, inflated in fruit, markedly asymmetric-bilabiate, slit between adaxial lobes, 2.5–3 mm, 8–11 mm in fruit, hairy, short-hairy or glabrescent in fruit, veins 10, connected by lateral veins, tube 2 mm, 7–9 mm in fruit, lobes green, erect, unequal, triangular, divergent, linear-lanceolate, unequal in fruit, orifice open;

corolla pink to purple, 5–8 mm, banner oblong, 5–8 × 2 mm, apex emarginate to crenulate.

Legumes

ovoid, 4–5 mm.

lenticular, 1.8–2.2 mm.

Seeds

1 or 2, yellow or reddish, mitten-shaped to ellipsoid, 2.5–3 mm, smooth.

1, ovoid, dark purple, olive green, yellow, or reddish brown, 1.5–1.9 mm, smooth, dull.

2n

= 32, 48.

= 14, 16, 32.

Trifolium macrocephalum

Trifolium resupinatum

Phenology Flowering Apr–Jun. Flowering Mar–May.
Habitat Rocky places, hard, compacted clay-gumbo, lava beds, sage-covered slopes, full sun. Wet meadows, lawns, road­sides, fields, waste places.
Elevation 80–2500 m. (300–8200 ft.) 0–700 m. (0–2300 ft.)
Distribution
from FNA
CA; ID; NV; OR; WA
[WildflowerSearch map]
[BONAP county map]
from FNA
AL; AR; CA; DC; FL; GA; IA; IL; IN; KS; KY; LA; MA; MD; MO; MS; NC; ND; OH; OK; OR; PA; SC; SD; TN; TX; VA; VT; WA; WI; WV; ON; c Europe; s Europe; sw Asia; n Africa; intro­duced also in s South America (Argentina, Uruguay); s Africa; Pacific Islands (Hawaii, New Zealand); Australia [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
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.)

Widespread use of Trifolium resupinatum as a forage crop began in the late 1920s, after it began to flourish in Louisiana following a flood of the Mississippi River (E. A. Hollowell 1943). It is used in the southern United States as a pasture plant and for production of hay, and has spread widely from cultivation.

Reports of Trifolium resupinatum for New Brunswick and Quebec are based on old collections; since the species has not been recollected for many years in either province, they are excluded here.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Trifolium Fabaceae > subfam. Faboideae > Trifolium
Sibling taxa
T. albopurpureum, T. alexandrinum, T. amoenum, T. amphianthum, T. andersonii, T. andinum, T. angustifolium, T. appendiculatum, T. arvense, T. attenuatum, T. aureum, T. barbigerum, T. barnebyi, T. beckwithii, T. bejariense, T. bifidum, T. bolanderi, T. brandegeei, T. breweri, T. buckwestiorum, T. calcaricum, T. campestre, T. carolinianum, T. cernuum, T. ciliolatum, T. columbinum, T. cyathiferum, T. dasyphyllum, T. dedeckerae, T. depauperatum, T. dichotomum, T. douglasii, T. dubium, T. echinatum, T. eriocephalum, T. fragiferum, T. friscanum, T. fucatum, T. glomeratum, T. gracilentum, T. grayi, T. gymnocarpon, T. haydenii, T. hirtum, T. howellii, T. hybridum, T. hydrophilum, T. incarnatum, T. jokerstii, T. kentuckiense, T. kingii, T. lappaceum, T. latifolium, T. leibergii, T. lemmonii, T. longipes, T. lupinaster, T. macilentum, T. macraei, T. medium, T. microcephalum, T. microdon, T. monanthum, T. mucronatum, T. nanum, T. nigrescens, T. obtusiflorum, T. oliganthum, T. ornithopodioides, T. owyheense, T. palmeri, T. parryi, T. pinetorum, T. piorkowskii, T. plumosum, T. polyodon, T. pratense, T. productum, T. reflexum, T. repens, T. resupinatum, T. retusum, T. rollinsii, T. siskiyouense, T. sonorense, T. stoloniferum, T. striatum, T. subterraneum, T. suffocatum, T. thompsonii, T. tomentosum, T. trichocalyx, T. variegatum, T. vesiculosum, T. virginicum, T. willdenovii, T. wormskioldii
T. albopurpureum, T. alexandrinum, T. amoenum, T. amphianthum, T. andersonii, T. andinum, T. angustifolium, T. appendiculatum, T. arvense, T. attenuatum, T. aureum, T. barbigerum, T. barnebyi, T. beckwithii, T. bejariense, T. bifidum, T. bolanderi, T. brandegeei, T. breweri, T. buckwestiorum, T. calcaricum, T. campestre, T. carolinianum, T. cernuum, T. ciliolatum, T. columbinum, T. cyathiferum, T. dasyphyllum, T. dedeckerae, T. depauperatum, T. dichotomum, T. douglasii, T. dubium, T. echinatum, T. eriocephalum, T. fragiferum, T. friscanum, T. fucatum, T. glomeratum, T. gracilentum, T. grayi, T. gymnocarpon, T. haydenii, T. hirtum, T. howellii, T. hybridum, T. hydrophilum, T. incarnatum, T. jokerstii, T. kentuckiense, T. kingii, T. lappaceum, T. latifolium, T. leibergii, T. lemmonii, T. longipes, T. lupinaster, T. macilentum, T. macraei, T. macrocephalum, T. medium, T. microcephalum, T. microdon, T. monanthum, T. mucronatum, T. nanum, T. nigrescens, T. obtusiflorum, T. oliganthum, T. ornithopodioides, T. owyheense, T. palmeri, T. parryi, T. pinetorum, T. piorkowskii, T. plumosum, T. polyodon, T. pratense, T. productum, T. reflexum, T. repens, T. retusum, T. rollinsii, T. siskiyouense, T. sonorense, T. stoloniferum, T. striatum, T. subterraneum, T. suffocatum, T. thompsonii, T. tomentosum, T. trichocalyx, T. variegatum, T. vesiculosum, T. virginicum, T. willdenovii, T. wormskioldii
Synonyms Lupinaster macrocephalum
Name authority (Pursh) Poiret in J. Lamarck et al.: Encycl., suppl. 5: 336. (1817) Linnaeus: Sp. Pl. 2: 771. (1753)
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