Trifolium andersonii |
Trifolium siskiyouense |
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Anderson's clover, fiveleaf clover |
Siskiyou clover |
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Habit | Herbs perennial, 5–12 cm, canescent. | Herbs perennial, 20–50 cm, glabrous; rhizomes elongate, slender, roots tuberous. | ||||||||
Stems | erect-ascending, cespitose, mat-forming, branched; from deep taproot-like crown. |
erect, sparsely branched. |
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Leaves | palmate; stipules ovate or lanceolate, 0.5–1.5 cm, margins entire, apex long-acuminate; petiole 1–5 cm; petiolules to 0.5 mm; leaflets (3–)5, blades obovate, 0.5–2.2 × 0.2–1.2 cm, base cuneate, veins obscured by pubescence, margins entire, apex rounded or acute, apiculate, surfaces canescent. |
palmate; stipules lanceolate, 0.8–1.5 cm, margins entire or slightly lacerate, apex acuminate; petiole 1.6–2.4 cm; petiolules 0.5 mm; leaflets 3, blades obovate, oblanceolate, or elliptic, 0.8–3 × 0.5–0.7 cm, base cuneate, veins fine or thickened distally, margins finely serrulate, apex acute, mucronate, or retuse, surfaces glabrous. |
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Inflorescences | axillary, 10–20-flowered, depressed-globose, 1–2 × 1–2.3 cm; involucres formed of connate, narrow, membranous bracts, to 0.5 mm. |
usually terminal, sometimes axillary, 30–50-flowered, subglobose, 1.2–1.8 × 1.5–2 cm; involucres shallowly bowl-shaped, 18–22 mm, deeply incised, lobes slender, irregular or bifurcate. |
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Peduncles | 1–14 cm. |
2.8–3.4 cm. |
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Pedicels | absent; bracteoles absent. |
straight, 0.5–0.8 mm; bracteoles linear, 1–2 mm. |
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Flowers | 10–17 mm; calyx campanulate, 9–11 mm, pilose, veins 10, tube 4–5 mm, lobes equal, subulate, plumose, orifice open; corolla white or pink, 10–17 mm, banner ovate-oblong, 12–19 × 3–5 mm, apex rounded, retuse. |
10–13 mm; calyx tubular, 0.5–0.6 mm, glabrous, veins 10, tube 2 mm, lobes ± equal, 3–4 mm, orifice open; corolla white to purple, 9–12 mm, banner oblong, 7–12 × 2–3 mm, apex retuse. |
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Legumes | ellipsoid, 4–5 mm. |
oblong, 2–4 mm. |
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Seeds | 1 (or 2), tan or brown, irregularly ovoid, 1.6–2 mm, smooth, glossy. |
2–4, brown, subglobose or mitten-shaped, 1.5 mm, smooth. |
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Trifolium andersonii |
Trifolium siskiyouense |
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Phenology | Flowering Jun–Jul. | |||||||||
Habitat | Wet meadows, grassy hillsides. | |||||||||
Elevation | 1000–1500 m. (3300–4900 ft.) | |||||||||
Distribution |
w United States
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CA; OR |
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Discussion | Subspecies 3 (3 in the flora). Trifolium andersonii encompasses three moderately well separable subspecies, with subsp. andersonii the more northern form in the range of the species, subsp. monoense in the southwestern portion of the range, and subsp. beatleyae in the eastern portion of the range (J. M. Gillett 1972). Intermediates between the latter two (and overlap in their ranges) make differentiation between them somewhat problematic, which prompted R. C. Barneby (1989) to combine them as var. beatleyae. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Trifolium siskiyouense is known from Shasta and Siskiyou counties, California, and Douglas, Jackson, and Josephine counties, Oregon. It is difficult to distinguish from T. wormskioldii without underground parts showing the tubers, but can be separated from the latter by deeply cut involucral segments, long-lobed, slender calyces, and the combination of long wing petals and short keel petals (J. M. Gillett 1980). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 11. | FNA vol. 11. | ||||||||
Parent taxa | Fabaceae > subfam. Faboideae > Trifolium | Fabaceae > subfam. Faboideae > Trifolium | ||||||||
Sibling taxa | ||||||||||
Subordinate taxa | ||||||||||
Synonyms | T. wormskioldii var. siskiyouense | |||||||||
Name authority | A. Gray: Proc. Amer. Acad. Arts 6: 522. (1865) | J. M. Gillett: Canad. J. Bot. 58: 1441. (1980) | ||||||||
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