Chylismia heterochroma |
Chylismia arenaria |
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Shockley's evening-primrose |
Fortuna Range suncup, sand evening-primrose |
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Habit | Herbs annual, glandular puberulent throughout, or glabrate and glaucous distally. | Herbs perennial, sometimes facultative annual, villous, sometimes also sparsely glandular puberulent in inflorescences. |
Stems | several, 10–100 cm. |
well branched, 25–180 cm. |
Leaves | primarily in poorly defined basal rosette, cauline greatly reduced when present; petiole 0.4–8 cm; blade unlobed, ovate to cordate, 2–11.5 × 1.4–5 cm, margins sinuate-dentate, brown oil cells prominently lining veins abaxially. |
cauline, often mostly toward base; petiole 3–6 cm; blade cordate-deltate, 2.5–4(–6) × 2.5–4(–6) cm, smaller distally, margins coarsely dentate. |
Racemes | erect, elongating in anthesis. |
nodding, open. |
Flowers | opening at sunrise; buds without free tips; floral tube 2–5 mm, villous inside; sepals 1.5–3.5 mm; petals lavender, paler and often with flecks toward base, often yellow at very base, fading darker lavender, 2–6 mm; stamens unequal, filaments of antisepalous ones 1.8–3 mm, of antipetalous ones 1–2.5 mm, anthers 0.6–1 mm, glabrous or sparsely ciliate; style 4–7 mm, stigma surrounded by anthers at anthesis. |
floral tube 18–40 mm, finely pubescent inside; sepals 8–15 mm; petals bright to pale yellow, 8–20 mm; filaments 5–9 mm, anthers 5–8 mm; style 30–58 mm, stigma exserted beyond anthers at anthesis. |
Capsules | erect, clavate, 7–13 mm; pedicel 2–5 mm. |
ascending, cylindrical, 30–44 mm; pedicel 2–5 mm. |
Seeds | 1–1.2 mm. |
0.5–0.7 mm. |
2n | = 14. |
= 14. |
Chylismia heterochroma |
Chylismia arenaria |
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Phenology | Flowering May–Jun. | Flowering Mar–Apr. |
Habitat | Alluvial and rocky slopes. | Sandy washes, rocky slopes, desert scrub in Sonoran Desert shrublands, usually with Ambrosia dumosa, Carnegiea, Larrea tridentata, and Prosopis. |
Elevation | 600–2200 m. (2000–7200 ft.) | -50–500 m. (-200–1600 ft.) |
Distribution |
CA; NV
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AZ; CA; Mexico (Sonora)
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Discussion | Chylismia heterochroma is known from Churchill and Lander counties, Nevada, south to Lincoln and southern Nye counties, Nevada, to adjacent California (Mono Lake, Mono County, and central Inyo counties). P. H. Raven (1962, 1969) determined this species to be self-compatible and autogamous. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Chylismia arenaria is known from the foot of the Needles in Mohave County, Arizona, and from the north end of the Salton Sea, Riverside County, California, southeastward to the Tinajas Atlas Range, Arizona, and Sonora, Mexico. P. H. Raven (1962, 1969) determined C. arenaria to be self-compatible, but primarily 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. Lignothera |
Sibling taxa | ||
Synonyms | Oenothera heterochromas., Camissonia heterochroma, C. heterochroma var. monoensis, O. heterochroma subsp. monoensis, O. heterochroma var. monoensis | Camissonia arenaria, Oenothera arenaria, O. cardiophylla var. longituba, O. cardiophylla var. splendens |
Name authority | (S. Watson) Small: Bull. Torrey Bot. Club 23: 193. (1896) — (as Chylisma) | A. Nelson: Amer. J. Bot. 21: 575. (1934) — (as Chylisma) |
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