Sidalcea robusta |
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Butte County checkerbloom |
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Habit | Herbs, perennial, (0.5–)0.8–1.2(–1.8) m, glaucous, with caudex and usually well-developed rhizomes to 0.5 mm diam. |
Stems | often single, usually scattered, erect, usually unbranched, solid or somewhat hollow in age, proximally densely, finely stellate-hairy, hairs spreading, distally glaucous, glabrous. |
Leaves | cauline, mostly on abaxially, bristly-hirsute adaxially. |
Inflorescences | erect, open, calyces not conspicuously overlapping except sometimes in bud, usually unbranched, loosely 10+-flowered, flowers 1+ cm apart, elongate, sometimes 1-sided, 30–40(–45) cm; bracts inconspicuous, lanceolate to linear, distal unlobed, 2–4 mm, proximal divided ± to base, 4–6 mm, usually equaling or shorter than pedicels. |
Pedicels | 2–5 mm; involucellar bractlets absent. |
Flowers | usually bisexual, sometimes pistillate, plants gynodioecious; calyx 10–15 mm, uniformly, densely stellate-puberulent; petals: bisexual pale pink, often drying yellowish, pale-veined or not, base pale pink to white, (15–)20–35 mm, pistillate usually darker purple, base white, 5(–10) mm; staminal column 6–8 mm, hairy; anthers white; stigmas (6 or)7 or 8. |
Seeds | 2–2.5 mm. |
Schizocarps | 6–8 mm diam.; mericarps (6 or)7 or 8, 3–3.5 mm, usually glabrous or very sparsely glandular-puberulent, distinctly narrowly wing-margined dorsally, sides lightly reticulate-veined, pitted, back less so, mucro 0.3–0.5 mm. |
2n | = 20. |
Sidalcea robusta |
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Phenology | Flowering Apr–May(–Jun). |
Habitat | Dry banks in chaparral at ecotone with foothill woodlands, often basaltic soil, with Quercus douglasii |
Elevation | 100–400(–1300) m (300–1300(–4300) ft) |
Distribution |
CA |
Discussion | Of conservation concern. Sidalcea robusta is one of the taller species of Sidalcea and can be distinguished also by its relatively long inflorescences with widely-spaced, showy flowers, its limited range, and its winged mericarps are notable. Rare and threatened by development, it is known from Butte County in the southern Cascade Range foothills and the northern Sierra Nevada foothills. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 6, p. 353. |
Parent taxa | |
Sibling taxa | |
Synonyms | S. asprella var. robusta |
Name authority | A. Heller ex Roush: Ann. Missouri Bot. Gard. 18: 205. (1931) |
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