Trifolium ciliolatum |
Trifolium siskiyouense |
|
---|---|---|
foothill clover, tree clover |
Siskiyou clover |
|
Habit | Herbs annual, 5–50 cm, glabrous or sparsely hairy. | Herbs perennial, 20–50 cm, glabrous; rhizomes elongate, slender, roots tuberous. |
Stems | erect, branched. |
erect, sparsely branched. |
Leaves | palmate; stipules ovate-lanceolate, 1–1.5 cm, margins entire, sometimes ciliate, apex acuminate; petiole 1–13 cm; petiolules 0.5 mm; leaflets 3, blades elliptic to oblong or obovate, 0.8–3.5 × 0.5–1.5 cm, base cuneate, veins thickened, margins serrate proximally, obscurely denticulate distally, apex usually rounded or retuse, rarely acute, surfaces glabrous. |
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. |
Inflorescences | axillary or terminal, 10–30-flowered, ovoid to subglobose, 0.7–2.2 × 0.5–2 cm; involucres a narrow rim, 0.5 mm, membranous, dentate. |
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. |
Peduncles | 2.5–12 cm. |
2.8–3.4 cm. |
Pedicels | erect becoming reflexed, 0.5–6 mm; bracteoles linear or cup-shaped, to 1 mm. |
straight, 0.5–0.8 mm; bracteoles linear, 1–2 mm. |
Flowers | 6–13 mm; calyx broadly campanulate, 5–11 mm, glabrous, veins 10, tube 1–5 mm, lobes unequal, elliptic to linear, margins hyaline, dentate or pectinate, ciliate, sinuses narrow, orifice open; corolla white, pink, or purple, 5–13 mm, banner broadly ovate, 6–13 × 4–7 mm, apex rounded, apiculate. |
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. |
Legumes | short-stipitate, ovoid, 5–10 mm. |
oblong, 2–4 mm. |
Seeds | 1 or 2, brown, mottled, ovoid, 2.5–3 mm, smooth. |
2–4, brown, subglobose or mitten-shaped, 1.5 mm, smooth. |
2n | = 16. |
|
Trifolium ciliolatum |
Trifolium siskiyouense |
|
Phenology | Flowering Apr–Jun. | Flowering Jun–Jul. |
Habitat | Oak-pine chaparral, meadows, roadsides. | Wet meadows, grassy hillsides. |
Elevation | 0–1500 m. (0–4900 ft.) | 1000–1500 m. (3300–4900 ft.) |
Distribution |
CA; OR; WA; Mexico (Baja California)
|
CA; OR |
Discussion | Trifolium ciliolatum is relatively widespread in California and is found in scattered sites in Baja California, Oregon, and Washington. Trifolium ciliatum Nuttall (1848), which pertains here, is a later homonym of T. ciliatum E. D. Clarke (1813). (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.) |
Source | FNA vol. 11. | FNA vol. 11. |
Parent taxa | Fabaceae > subfam. Faboideae > Trifolium | Fabaceae > subfam. Faboideae > Trifolium |
Sibling taxa | ||
Synonyms | T. ciliatum var. discolor | T. wormskioldii var. siskiyouense |
Name authority | Bentham: Pl. Hartw., 304. (1849) | J. M. Gillett: Canad. J. Bot. 58: 1441. (1980) |
Web links |