Chylismia heterochroma |
Chylismia atwoodii |
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Shockley's evening-primrose |
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Habit | Herbs annual, glandular puberulent throughout, or glabrate and glaucous distally. | Herbs annual, glandular puberulent. |
Stems | several, 10–100 cm. |
several, 5–150 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. |
in poorly defined basal rosette and cauline; petiole 0.7–3.4 cm; blade unlobed, broadly ovate to oblong-ovate, elliptic, or subcordate, 1.2–7.6 × 0.8–5.5 cm, margins serrulate to serrate-denticulate, brown oil cells prominently lining veins abaxially. |
Racemes | erect, elongating in anthesis. |
erect, elongating in flower. |
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. |
opening at sunrise; buds without free tips; floral tube 0.6–1 mm; sepals 5–7 mm; petals purple, fading darker purple, 7–14 mm; stamens 4 + 4, unequal, anthers 1.5–2 mm, glabrous, stigma exserted beyond anthers at anthesis. |
Capsules | erect, clavate, 7–13 mm; pedicel 2–5 mm. |
spreading to reflexed, clavate, 11–25 mm; pedicel 3–5 mm. |
Seeds | 1–1.2 mm. |
1.5–1.8 mm. |
2n | = 14. |
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Chylismia heterochroma |
Chylismia atwoodii |
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Phenology | Flowering May–Jun. | Flowering Aug–Nov. |
Habitat | Alluvial and rocky slopes. | Open slopes in desert shrub communities, on clay soil. |
Elevation | 600–2200 m. (2000–7200 ft.) | 1100–1600 m. (3600–5200 ft.) |
Distribution |
CA; NV
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UT |
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 atwoodii is known only from eastern Kane County, and only from a few collections, so is still poorly characterized morphologically, but clearly distinct among the purple-petaled species. (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 heterochromas., Camissonia heterochroma, C. heterochroma var. monoensis, O. heterochroma subsp. monoensis, O. heterochroma var. monoensis | Camissonia atwoodii |
Name authority | (S. Watson) Small: Bull. Torrey Bot. Club 23: 193. (1896) — (as Chylisma) | (Cronquist) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 205. (2007) |
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