Trifolium productum |
Trifolium piorkowskii |
|
---|---|---|
elongated clover, productive clover, Shasta clover |
marshmallow clover, Piorkowski's clover |
|
Habit | Herbs perennial, 15–45 cm, glabrous. | Herbs annual, 7–30 cm, glabrous. |
Stems | ± erect, loosely cespitose, branched. |
erect or ascending, sparsely to much 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 ovate-lanceolate, 1–1.5 cm, margins entire, apex acute-acuminate; petiole 8–12 cm; petiolules 1 mm; leaflets 3, blades oblanceolate or obovate, 2.8 × 1.9 cm, base cuneate, veins delicate, margins entire or shallowly dentate distally, lateral veins sometimes ending in a bristle, apex rounded to acute, 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. |
axillary or terminal, 3–16-flowered, in 1–3 whorls, subglobose, 2–2.8 × 1.8–2.6 cm; involucres bowl-shaped, 6–15 mm, lobes 6–8, broadly lanceolate, margins entire, acuminate, apex 3–5-fid. |
Peduncles | 2–13 cm, slightly twisted apically. |
5–15 cm. |
Pedicels | strongly reflexed in fruit, 0.5 mm; bracteoles minute, lanceolate. |
straight, 0.5–1 mm; bracteoles absent. |
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. |
12–14 mm; calyx campanulate, 5–8 mm, glabrous, veins 10, tube 2.5–4 mm, lobes 11–15, unequal, abaxial 3–5 forked, adaxial unbranched, orifice open; corolla creamy white to pinkish, 11–13 mm, banner ovate, inflated entire length in fruit, not distally twisted, 11–13 × 5–7 mm, apex rounded. |
Legumes | obliquely ellipsoid, 5 mm. |
ellipsoid, 5–6 mm. |
Seeds | 1 or 2, brown, often purple-mottled, flattened ovoid, 2–3 mm, smooth. |
1 or 2, gray-brown, black-mottled, subglobose, 2.5 mm, smooth. |
2n | = 16. |
|
Trifolium productum |
Trifolium piorkowskii |
|
Phenology | Flowering May–Sep. | Flowering Apr–May. |
Habitat | Open coniferous woods, rocky places, stream banks, grassy meadows, near springs. | Shallow, vernally wet depressions on volcanic flats, banks of watercourses flowing through open rocky grassland, transitional habitats with scattered chaparral and conifers. |
Elevation | 1100–2800 m. (3600–9200 ft.) | 300–800 m. (1000–2600 ft.) |
Distribution |
CA; NV; OR
|
CA |
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 piorkowskii is known only from Shasta County. (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 | |
Name authority | Greene: Erythea 2: 181. (1894) | Rand. Morgan & A. L. Barber: Novon, 23: 65, plate 1. (2014) |
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