Trifolium productum |
Trifolium attenuatum |
|
---|---|---|
elongated clover, productive clover, Shasta clover |
Rocky Mountain clover |
|
Habit | Herbs perennial, 15–45 cm, glabrous. | Herbs perennial, 5–30 cm, pubescent. |
Stems | ± erect, loosely cespitose, branched. |
erect or ascending, cespitose, branched from base, numerous short stems. |
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, 1.8–2 cm, margins entire, apex acute-acuminate; petiole 2.5–10 cm; petiolules to 0.5 mm; leaflets 3, blades linear, lanceolate, or narrowly elliptic, 1.5–6 × 0.3–1 cm, base cuneate, veins moderately thickened, margins entire, apex acuminate or narrowly acute, surfaces glabrous or pubescent. |
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. |
axillary or terminal, 10–20+-flowered, globose, 2.3–3.5 × 2.5–4 cm; involucres formed of proximal bracteoles, bases sometimes connate. |
Peduncles | 2–13 cm, slightly twisted apically. |
2–28 cm. |
Pedicels | strongly reflexed in fruit, 0.5 mm; bracteoles minute, lanceolate. |
reflexed in fruit, 2–4 mm; bracteoles ovate, 2–4 mm, truncate or acuminate. |
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. |
15–22 mm; calyx campanulate, 8–15 mm, pubescent, veins 10, tube 2.5–7 mm, lobes unequal, subulate, orifice open; corolla red-purple, 16–20 mm, banner broadly oblong-elliptic, 16–20 × 6–7 mm, apex acute, apiculate. |
Legumes | obliquely ellipsoid, 5 mm. |
oblong, 5–6 mm. |
Seeds | 1 or 2, brown, often purple-mottled, flattened ovoid, 2–3 mm, smooth. |
1–3, brown, ovoid-reniform, 2.5 mm, smooth. |
2n | = 16. |
= 16, 48. |
Trifolium productum |
Trifolium attenuatum |
|
Phenology | Flowering May–Sep. | Flowering Jun–Aug. |
Habitat | Open coniferous woods, rocky places, stream banks, grassy meadows, near springs. | Subalpine and alpine slopes, open montane forests. |
Elevation | 1100–2800 m. (3600–9200 ft.) | 3000–3800 m. (9800–12500 ft.) |
Distribution |
CA; NV; OR
|
CO; NM
|
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 attenuatum ranges from Park County in Colorado southward through southern and southwestern Colorado to northern and central New Mexico. J. M. Gillett (1965) found both diploid and hexaploid populations of Trifolium attenuatum but was unable to find morphological distinctions between diploid and hexaploid individuals. Using flavonoid chemotaxonomy, E. V. Parups et al. (1966) found close associations between T. attenuatum, T. brandegeei, and T. haydenii. Trifolium lilacinum Rydberg (1901), which pertains here, is a later homonym of T. lilacinum Greene (1896) and thus illegitimate. (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. bracteolatum, T. petraeum, T. stenolobum |
Name authority | Greene: Erythea 2: 181. (1894) | Greene: Pittonia 4: 137. (1900) |
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