Trifolium owyheense |
Trifolium amphianthum |
|
---|---|---|
Owyhee clover |
peanut clover |
|
Habit | Herbs perennial, 10–20 cm, glaucous, glabrous. | Herbs perennial, 10–25 cm, glabrous or glabrate. |
Stems | cespitose, spreading, branched proximally, sparsely branched distally. |
creeping, branched, rooting at nodes. |
Leaves | palmate; stipules broadly obovate, 1–2 cm, fused at base, margins slightly lobed, apex acute; petiole 2–6 cm; petiolules 1–1.5 mm; leaflets 3, blades ovate, obovate, or orbiculate, slightly overlapping, 1–2 × 0.7–2.3 cm, base truncate to rounded, veins prominent, margins sparsely dentate, apex rounded, emarginate, surfaces glabrous. |
palmate; stipules ovate-lanceolate, 0.5–1 cm, margins entire, apex acute to acuminate; petiole 3–10 cm; petiolules 0.5–1 mm; leaflets 3, blades obcordate, 0.5–1.8 × 0.5–1.5 cm, base cuneate, veins thickened, margins entire or denticulate distally, apex usually deeply emarginate, rarely rounded, surfaces glabrous. |
Inflorescences | terminal, 20–30-flowered, globose, usually formed of 2 sessile heads, 2.5–5 × 2.5–5 cm; involucres absent. |
axillary, 5–20-flowered, globose, 1–2.2 × 1–20 cm, chasmogamous erect, cleistogamous becoming subterranean; involucres formed of distinct, narrowly lanceolate bracts, 2.5–3.5 mm. |
Peduncles | 3–7 cm, surpassing subtending leaves. |
chasmogamous 6–8 cm, cleistogamous ± sessile. |
Pedicels | erect, reflexed in proximalmost flowers, 1 mm; bracteoles cuplike, 0.5 mm. |
reflexed in fruit, cleistogamous pushing fruit underground, chasmogamous 1–8 mm, cleistogamous 4–20 mm; bracteoles lanceolate, 2–4 mm. |
Flowers | 15–21 mm; calyx tubular-campanulate, 9–12 mm, pilose, veins 10, tube 4.5–6 mm, lobes subequal, abaxialmost longest, subulate, orifice open; corolla deep pink or magenta, 20–23 mm, banner tubular for most their length, 18–22 × 5–7 mm, apex flared. |
chasmogamous 8–11 mm, cleistogamous 4–5 mm; calyx campanulate, 3–5 mm, slightly pilose, veins 10, tube 1.5–2 mm, lobes subequal, adaxial pair connate proximally, sometimes nearly entire length, narrowly triangular-subulate, orifice open; corolla magenta or pink, 7.5–11 mm, banner broadly obovate-elliptic, 5–10 × 5–8 mm, apex rounded, emarginate. |
Legumes | ellipsoid, 4–5 mm. |
stipitate, chasmogamous ellipsoid, cleistogamous ovoid-globose, chasmogamous longitudinally dehiscent, 3–6 mm, cleistogamous indehiscent, 3–6 mm. |
Seeds | 1 or 2, yellow-mottled, mitten-shaped, 2–3 mm, smooth. |
2–6 (chasmogamous), 1–3 (cleistogamous), tan, mitten-shaped, 1.2–1.5 mm, smooth. |
2n | = 16, 32. |
|
Trifolium owyheense |
Trifolium amphianthum |
|
Phenology | Flowering May–Jun. | Flowering Mar–Jun. |
Habitat | Dry shale hillsides on diatomaceous earth. | Sandy soils, prairies. |
Elevation | 1000–2000 m. (3300–6600 ft.) | 0–200 m. (0–700 ft.) |
Distribution |
ID; OR
|
LA; TX |
Discussion | Trifolium owyheense is known from about 40 populations in a small portion of east-central Malheur County in Oregon, and immediately adjacent Owyhee County in Idaho (M. Mancuso 2001). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Trifolium amphianthum ranges in east-central Texas from Aransas County northward to Denton County, and eastward to San Augustine and Shelby counties; it is also recorded from Natchitoches and Rapides parishes in Louisiana. Trifolium amphianthum was collected once in Arkansas, but the specimen may have been from cultivation. The name Trifolium polymorphum Poiret applies to plants found in Argentina, Brazil, Paraguay, and Uruguay and has been misapplied to this North American endemic, as was done by M. Zohary and D. Heller (1984). Trifolium amphianthum is distinguished from T. polymorphum by its much larger leaves and flowers and essentially glabrous leaves and peduncles. (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. roemerianum | |
Name authority | Gilkey: Madroño 13: 169, fig. 1. (1956) | Torrey & A. Gray: Fl. N. Amer. 1: 316. (1838) |
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