Trifolium douglasii |
Trifolium siskiyouense |
|
---|---|---|
Douglas' clover |
Siskiyou clover |
|
Habit | Herbs perennial, 20–75 cm, glabrous or slightly pilose. | Herbs perennial, 20–50 cm, glabrous; rhizomes elongate, slender, roots tuberous. |
Stems | erect, unbranched or sparsely branched. |
erect, sparsely branched. |
Leaves | palmate; stipules lanceolate to ovate, 1.5–6.5 cm, margins setose-serrulate or entire, apex acuminate; petiole 1.5–15 cm; petiolules 1 mm; leaflets 3, blades elliptic-oblanceolate to linear-elliptic, 3–9.5 × 0.5–1.6 cm, base cuneate, lateral veins prominent, recurved, dichotomously forked near margin, margins setose-denticulate to serrate, apex rounded or acute, surfaces glaucous, glabrous, sometimes sparsely pubescent abaxially. |
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 | terminal or axillary, 30–50+-flowered, umbellate, globose to ovoid, 1.5–5 × 2–3.5 cm; involucres absent. |
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 | 3–12 cm. |
2.8–3.4 cm. |
Pedicels | erect or slightly reflexed, to 0.2 mm; bracteoles minute. |
straight, 0.5–0.8 mm; bracteoles linear, 1–2 mm. |
Flowers | 14–16 mm; calyx campanulate, 6–9 mm, pilose, veins 15–20, tube 1.5–3 mm, lobes unequal, narrow, triangular or subulate, abaxial lobe straight, lateral and adaxial tortuous, recurved inwards around corolla, orifice open; corolla magenta, 12–16 mm, banner oblong, 12–16 × 4–6 mm, apex flared, acute or obtuse; ovaries glabrous or pubescent distally. |
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 | ovoid, 3–4.5 mm. |
oblong, 2–4 mm. |
Seeds | 1 or 2, tan to brown, ovoid, 1–1.5 mm, slightly roughened. |
2–4, brown, subglobose or mitten-shaped, 1.5 mm, smooth. |
2n | = 16. |
|
Trifolium douglasii |
Trifolium siskiyouense |
|
Phenology | Flowering Jun–Jul. | Flowering Jun–Jul. |
Habitat | Moist meadows, rich soils in prairies, stream bottoms and banks, openings in pine forests. | Wet meadows, grassy hillsides. |
Elevation | 600–1500 m. (2000–4900 ft.) | 1000–1500 m. (3300–4900 ft.) |
Distribution |
ID; OR; WA
|
CA; OR |
Discussion | Trifolium douglasii is rare throughout its range and has been impacted by agricultural practices (P. Camp et al. 2011). (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. altissimum | T. wormskioldii var. siskiyouense |
Name authority | House: Bot. Gaz. 41: 335. (1906) | J. M. Gillett: Canad. J. Bot. 58: 1441. (1980) |
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