Trifolium productum |
Trifolium siskiyouense |
|
---|---|---|
elongated clover, productive clover, Shasta clover |
Siskiyou clover |
|
Habit | Herbs perennial, 15–45 cm, glabrous. | Herbs perennial, 20–50 cm, glabrous; rhizomes elongate, slender, roots tuberous. |
Stems | ± erect, loosely cespitose, branched. |
erect, sparsely branched. |
Leaves | basal and cauline, palmate; stipules ovate-lanceolate, 0.5–2 cm, margins usually entire, sometimes lobed, apex acute to acuminate; petiole 0.5–12 cm; petiolules 1 mm; leaflets 3, blades lanceolate or elliptic, 0.5–2 × 0.3–1.3 cm, base cuneate, veins prominent, margins serrate, apex acute, apiculate, 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 | terminal or axillary, 15–30-flowered, ellipsoid or conic, 1.5–2 × 1–3 cm, rachis prolonged beyond flowers, undivided or forked, often bearing sterile flower buds distally; 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 | 2–13 cm, slightly twisted apically. |
2.8–3.4 cm. |
Pedicels | strongly reflexed in fruit, 0.5 mm; bracteoles minute, lanceolate. |
straight, 0.5–0.8 mm; bracteoles linear, 1–2 mm. |
Flowers | 12–14 mm; calyx pink to purple, campanulate, 3–3.5 mm, glabrous, veins 10 (5 sometimes faint), tube 1.5–1.7 mm, lobes subequal, triangular-subulate, orifice open; corolla pink to deep purple, 12–14 mm, banner oblong, 12–14 × 4–5 mm, apex rounded or 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. |
Legumes | obliquely ellipsoid, 5 mm. |
oblong, 2–4 mm. |
Seeds | 1 or 2, brown, often purple-mottled, flattened ovoid, 2–3 mm, smooth. |
2–4, brown, subglobose or mitten-shaped, 1.5 mm, smooth. |
2n | = 16. |
|
Trifolium productum |
Trifolium siskiyouense |
|
Phenology | Flowering May–Sep. | Flowering Jun–Jul. |
Habitat | Open coniferous woods, rocky places, stream banks, grassy meadows, near springs. | Wet meadows, grassy hillsides. |
Elevation | 1100–2800 m. (3600–9200 ft.) | 1000–1500 m. (3300–4900 ft.) |
Distribution |
CA; NV; OR
|
CA; OR |
Discussion | Trifolium productum is morphologically most similar to T. kingii, from which it differs by its glabrous calyces and inflorescence rachises surpassing the flowers to 1.5 cm and apically forked (M. Zohary and D. Heller 1984). Trifolium productum is geographically isolated from T. kingii; the former is restricted to northern California, western Oregon, and western Nevada, while the latter is restricted to Utah and easternmost Nevada (J. M. Gillett 1972). (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. kingii subsp. productum, T. kingii var. productum | T. wormskioldii var. siskiyouense |
Name authority | Greene: Erythea 2: 181. (1894) | J. M. Gillett: Canad. J. Bot. 58: 1441. (1980) |
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