Trifolium macraei |
Trifolium andinum |
|
---|---|---|
Chilean clover, Macrae's clover |
Great Divide clover, intermountain clover |
|
Habit | Herbs annual, 3–30 cm, pubescent. | Herbs perennial, 5–15 cm, pubescent. |
Stems | erect, ascending, or prostrate, branched. |
erect or ascending, cespitose, much-branched. |
Leaves | 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. |
palmate; stipules oblanceolate, 0.5–1.4 cm, margins entire, apex acute-acuminate; petiole 0.5–4 cm; petiolules to 0.1 mm; leaflets 3, blades oblanceolate, often folded, 0.4–1.5 × 0.2–0.4 cm, base cuneate, veins obscure, margins subentire to denticulate distally, apex acute, mucronulate, surfaces villous. |
Inflorescences | 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. |
terminal, usually formed of 2 sessile heads, 15–25-flowered, globose, 0.8–2 × 0.6–1.5 cm; involucres absent, distal stipules and leaves sometimes forming involucrelike structure. |
Peduncles | 0–0.2 cm. |
between distal leaves or involucrelike structure and inflorescences 0.5–6 cm. |
Pedicels | absent; bracteoles broadly ovate to linear, 1–2 mm. |
straight, (0–)1–2 mm; bracteoles broadly ovate, truncate, membranous, to 0.5 mm. |
Flowers | 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. |
10–15 mm; calyx tubular-campanulate, 6–9 mm, rough-hairy or glabrous, veins 10, tube 3–6 mm, lobes subequal, subulate, orifice open; corolla light purple, 10–15 mm, banner oblong, 9–13 × 3–4 mm, apex rounded or truncate; ovaries pubescent distally. |
Legumes | oblong, 2.5–3 mm. |
ellipsoid, 4–5 mm. |
Seeds | 1, yellow, mottled, ellipsoid, 1.6–2 mm, smooth. |
1 or 2, brown, ovoid, 1.5–2 mm, smooth. |
2n | = 16. |
|
Trifolium macraei |
Trifolium andinum |
|
Phenology | Flowering May–Jun. | Flowering May–Jun. |
Habitat | Grassy fields, sandy ocean bluffs. | Shale or clay bluffs and hilltops, crevices of volcanic or limestone rock, pinyon-juniper belt. |
Elevation | 0–800 m. (0–2600 ft.) | 1600–2300 m. (5200–7500 ft.) |
Distribution |
CA; OR; South America (Chile)
|
AZ; CO; NM; NV; UT; WY
|
Discussion | 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.) |
Trifolium andinum ranges from central and southern Nevada into west-central Utah, north-central Arizona to southeastern Utah, north-central New Mexico, and northeastern Utah into southwestern Wyoming. Differentiation of T. andinum into subspecific taxa proved impossible, since no consistent gaps in morphological traits could be found. (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 | T. andinum var. canone, T. andinum var. navajoense, T. andinum var. podocephalum, T. andinum var. wahwahense |
Name authority | Hooker & Arnott: Bot. Misc. 3: 179. (1833) | Nuttall in J. Torrey and A. Gray: Fl. N. Amer. 1: 314. (1838) |
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