Trifolium andersonii |
Trifolium productum |
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Anderson's clover, fiveleaf clover |
elongated clover, productive clover, Shasta clover |
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Habit | Herbs perennial, 5–12 cm, canescent. | Herbs perennial, 15–45 cm, glabrous. | ||||||||
Stems | erect-ascending, cespitose, mat-forming, branched; from deep taproot-like crown. |
± erect, loosely cespitose, 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. |
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. |
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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. |
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. |
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Peduncles | 1–14 cm. |
2–13 cm, slightly twisted apically. |
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Pedicels | absent; bracteoles absent. |
strongly reflexed in fruit, 0.5 mm; bracteoles minute, lanceolate. |
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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. |
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. |
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Legumes | ellipsoid, 4–5 mm. |
obliquely ellipsoid, 5 mm. |
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Seeds | 1 (or 2), tan or brown, irregularly ovoid, 1.6–2 mm, smooth, glossy. |
1 or 2, brown, often purple-mottled, flattened ovoid, 2–3 mm, smooth. |
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2n | = 16. |
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Trifolium andersonii |
Trifolium productum |
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Phenology | Flowering May–Sep. | |||||||||
Habitat | Open coniferous woods, rocky places, stream banks, grassy meadows, near springs. | |||||||||
Elevation | 1100–2800 m. (3600–9200 ft.) | |||||||||
Distribution |
w United States
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CA; NV; 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 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.) |
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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. kingii subsp. productum, T. kingii var. productum | |||||||||
Name authority | A. Gray: Proc. Amer. Acad. Arts 6: 522. (1865) | Greene: Erythea 2: 181. (1894) | ||||||||
Web links |