Chylismia multijuga |
Chylismia megalantha |
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froststem suncup |
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Habit | Herbs annual or biennial, villous, at least proximally, glabrous or even glaucous distally, rarely glandular puberulent. | Herbs annual, glandular pubescent throughout. |
Stems | virgate with numerous divergent branches, 20–150 cm. |
several, 10–200 cm. |
Leaves | primarily in well-developed basal rosette, cauline reduced or absent, 6–30 × 1.4–6.5 cm; petiole 0.3–6 cm; blade pinnately or bipinnately lobed, terminal lobe ovate to elliptic, 2.5–6.5 × 1.5–3 cm, margins irregularly serrate, dark brown oil cells prominently lining veins abaxially. |
in poorly defined basal rosette and cauline; petiole 1.8–5.5 cm; blade unlobed, broadly cordate to ovate, 2.4–8 × 7 cm, margins sinuate-dentate, yellowish oil cells prominently lining veins abaxially. |
Racemes | erect to nodding, elongating in bud. |
erect, elongating in flower. |
Flowers | opening at sunrise; buds individually reflexed, with apical or slightly subapical free tips less than 1 mm; floral tube 1–3 mm, glabrous or villous inside proximally; sepals 3–8 mm; petals usually bright yellow, rarely cream, fading yellow to lavender, 4–9 mm; stamens unequal, filaments of antisepalous stamens 2.5–4 mm, those of antipetalous ones 1.3–3 mm, anthers 2–4 mm, ciliate; style 7–11 mm, stigma exserted beyond anthers at anthesis. |
opening at sunrise; buds without free tips; floral tube 4–9 mm, with matted, villous hairs inside; sepals 4.5–9 mm; petals pale to dark lavender, diffusely purplish-flecked near base, white at very base, fading darker lavender, 9–14 mm; stamens unequal, filaments of antisepalous stamens 6–12 mm, of antipetalous ones 3.5–8 mm, anthers 2 mm, glabrous; style 14–22.5 mm, stigma exserted beyond anthers at anthesis. |
Capsules | usually spreading, rarely slightly reflexed, oblong-cylindrical, 10–52 mm; pedicel 7–20 mm. |
erect or ascending, clavate, 8–14 mm; pedicel 2–3.5 mm. |
Seeds | 1–1.3 mm. |
1–1.3 mm. |
2n | = 14. |
= 14. |
Chylismia multijuga |
Chylismia megalantha |
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Phenology | Flowering Mar–Jun(–Sep). | Flowering Jun–Oct. |
Habitat | Forming colonies on rocky slopes and banks of eroded sedimentaries, on gypsum or limestone, on conglomerates, often with Juniperus and Pinus edulis, with Encelia farinosa and Larrea. | Rubble derived from volcanic tuff, partly on moist soil along springs. |
Elevation | 300–1100 m. (1000–3600 ft.) | 1200–1400 m. (3900–4600 ft.) |
Distribution |
AZ; NV; UT
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NV |
Discussion | Chylismia multijuga is known from Washington County, Utah, and southern Lincoln County, Nevada, to northern Mohave County, Arizona. P. H. Raven (1962, 1969) determined this species to be self-incompatible. It hybridizes with C. brevipes subspp. brevipes and pallidula. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Chylismia megalantha is known from around Frenchman Drainage to French Peak and Skull Mountain in southern Nye County. P. H. Raven (1962, 1969) determined this species to be self-compatible, but outcrossing. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 10. | FNA vol. 10. |
Parent taxa | Onagraceae > subfam. Onagroideae > tribe Onagreae > Chylismia > sect. Chylismia | Onagraceae > subfam. Onagroideae > tribe Onagreae > Chylismia > sect. Chylismia |
Sibling taxa | ||
Synonyms | Oenothera multijuga, Camissonia multijuga, Chylisma hirta, C. parviflora, C. venosa, O. brevipes var. multijuga, O. brevipes var. parviflora, O. multijuga var. parviflora, O. phlebophylla, O. watsonii | Oenothera heterochromas. var. megalantha, Camissonia megalantha, O. megalantha |
Name authority | (S. Watson) Small: Bull. Torrey Bot. Club 23: 193. (1896) — (as Chylisma) | (Munz) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 207. (2007) |
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