Trifolium vesiculosum |
Trifolium variegatum |
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arrow-leaf clover |
variegated clover, white-tip clover |
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Habit | Herbs annual, 15–70 cm, glabrous. | Herbs annual, 1.5–48+ cm, glabrous. |
Stems | erect or ascending, branched. |
usually erect, ascending, or prostrate, branched. |
Leaves | palmate; stipules linear-lanceolate, 1–3.5 cm, margins entire, apex subulate or setaceous; petiole 0.5–10 cm; petiolules 1 mm; leaflet 3, blades obovate to oblong, elliptic or lanceolate, 0.5–4 × 0.5–1.5 cm, base cuneate, veins prominent, thickened, margins spinulose-denticulate, apex apiculate, surfaces glabrous. |
palmate; stipules lanceolate or ovate, 0.3–1 cm, margins lacerate, apex acute to acuminate; petiole 1–9 cm; petiolules to 0.8 mm; leaflets 3, blades elliptic, obovate, oblanceolate, or obcordate, 0.2–5 × 0.1–1.2 cm, base cuneate, veins thickened, margins denticulate, apex acute or retuse, surfaces glabrous. |
Inflorescences | terminal or axillary, 50–100+-flowered, globose, ovoid, or oblong, 3–6 × 2–3.5 cm; involucres absent. |
terminal or axillary, 1–20+-flowered, subglobose or globose, 0.5–1.3 × 0.1–1 cm; involucres flat, 2–6 mm, incised 1/2 their length, lobes 2–7, lacerate. |
Peduncles | 1–12 cm. |
0.5–5 cm. |
Pedicels | absent; bracteoles lanceolate, 6–7 mm, acuminate. |
straight, to 0.5 mm; bracteoles absent. |
Flowers | 12–16 mm; calyx urceolate, not bilabiate, inflated in fruit, 6–10 mm, glabrous, veins 20–36, connected by transverse veins in fruit, tube 3–5 mm, lobes reflexed, subequal, subulate, as long as tube, orifice constricted; corolla white becoming pink, 12–15 mm, banner ovate, broadly clawed, striate, 12–15 × 2–4 mm, apex acute-acuminate. |
5–11 mm; calyx campanulate, not slit between adaxial lobes, 1.9–2.4 mm, glabrous, veins 10–20, tube 1.5–4 mm, lobes subequal, narrowly triangular, margins usually entire, rarely with a small lateral tooth, orifice open; corolla purple, usually white-tipped, 3–10 mm, banner obovate, 3–10 × 0.6–2.6 mm, apex emarginate. |
Legumes | ellipsoid, 2.5–2.5 mm, shorter than calyx. |
oblong or ellipsoid, 2–4 mm. |
Seeds | 2 or 3, brown, ovoid, 1–1.5 mm, roughened. |
2, blackish brown, sometimes mottled, ovoid or ellipsoid, 1–1.6 mm, smooth. |
2n | = 16. |
= 16. |
Trifolium vesiculosum |
Trifolium variegatum |
|
Phenology | Flowering Apr–Jul. | Flowering Mar–Sep. |
Habitat | Fields, roadsides, forest openings. | Wet places, coastal hills, meadows. |
Elevation | 0–1000 m. (0–3300 ft.) | 0–2500 m. (0–8200 ft.) |
Distribution |
AL; AR; CA; FL; GA; LA; MA; MO; MS; OK; OR; SC; TX; VA; WA; s Europe; e Europe; w Asia [Introduced in North America]
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AK; AZ; CA; ID; MT; NV; OR; UT; WA; WY; BC; Mexico (Baja California)
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Discussion | Trifolium vesiculosum was first introduced into cultivation in the United States in 1963 and is grown in southern and western states (J. D. Miller and H. D. Wells 1985). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Trifolium variegatum is widespread and morphologically variable (B. G. Foster and M. A. Vincent 2018). Because of this variability, T. variegatum and related species were treated as seven so-called phases by D. Isely (1998), who described these as ecotypic groups, some of which might deserve varietal or specific rank. C. S. Cooper (1957) considered T. variegatum a good choice for cultivation in wet areas for grazing and hay production. (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 | ||
Synonyms | T. dianthum, T. geminiflorum, T. melananthum, T. pusillum, T. spinulosum var. triste, T. subsalinum, T. tridentatum var. melananthum, T. ultramontanum, T. variegatum var. geminiflorum, T. variegatum var. melananthum | |
Name authority | Savi: Fl. Pis. 2: 165. (1798) — (as vessiculosum) | Nuttall in J. Torrey and A. Gray: Fl. N. Amer. 1: 317. (1838) |
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