Trifolium vesiculosum |
Trifolium macraei |
|
---|---|---|
arrow-leaf clover |
Chilean clover, Macrae's clover |
|
Habit | Herbs annual, 15–70 cm, glabrous. | Herbs annual, 3–30 cm, pubescent. |
Stems | erect or ascending, branched. |
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 ovate to oblong, 0.6–1 cm, margins entire, apex acuminate to cuspidate; petiole 0.5–6 cm; petiolules to 0.5 mm; leaflets 3, blades obovate, oblanceolate, or elliptic, 0.6–1.6 × 0.3–1.2 cm, base cuneate, veins obscure or slightly thickened, margins subentire to serrate, apex rounded, retuse, surfaces pubescent. |
Inflorescences | terminal or axillary, 50–100+-flowered, globose, ovoid, or oblong, 3–6 × 2–3.5 cm; involucres absent. |
terminal or subterminal, usually paired, sometimes one head slightly stalked, partially hidden by terminal leaves and stipules, 10–40-flowered, ovoid or subglobose, 0.8–2.5 × 0.5–2 cm; involucres absent, involucrelike structure formed from terminal leaves and stipules. |
Peduncles | 1–12 cm. |
0–0.2 cm. |
Pedicels | absent; bracteoles lanceolate, 6–7 mm, acuminate. |
absent; bracteoles broadly ovate to linear, 1–2 mm. |
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. |
5.5–7.5 mm; calyx tubular, 4–5 mm, pubescent, veins 5–10, tube 1.5–2 mm, lobes subequal, subulate, orifice open; corolla usually purple or pink, rarely white, 5–7 mm, banner obovate-oblong, 6–7 × 2–3 mm, apex rounded, slightly denticulate. |
Legumes | ellipsoid, 2.5–2.5 mm, shorter than calyx. |
oblong, 2.5–3 mm. |
Seeds | 2 or 3, brown, ovoid, 1–1.5 mm, roughened. |
1, yellow, mottled, ellipsoid, 1.6–2 mm, smooth. |
2n | = 16. |
= 16. |
Trifolium vesiculosum |
Trifolium macraei |
|
Phenology | Flowering Apr–Jul. | Flowering May–Jun. |
Habitat | Fields, roadsides, forest openings. | Grassy fields, sandy ocean bluffs. |
Elevation | 0–1000 m. (0–3300 ft.) | 0–800 m. (0–2600 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]
|
CA; OR; South America (Chile)
|
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 macraei was described from specimens collected in Chile; the South American plants have broader banners, smaller auricles on the wing petals, and styles that are barely curved upwards distally (D. Isely 1998). Further examination of the disjunct populations may reveal other differences and prompt reconsideration of the identity of North American specimens. The record from Massachusetts is a waif. (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. bicephalum, T. catalinae, T. mercedense, T. traskiae | |
Name authority | Savi: Fl. Pis. 2: 165. (1798) — (as vessiculosum) | Hooker & Arnott: Bot. Misc. 3: 179. (1833) |
Web links |
|