Chylismia heterochroma |
Chylismia exilis |
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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 and sparsely villous. |
Stems | several, 10–100 cm. |
slender, unbranched or branched, 10–20 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. |
primarily cauline; petiole 0.3–1.8 cm; blade unlobed, narrowly ovate to elliptic, 0.3–2 × 0.3–1 cm, margins entire or inconspicuously denticulate, brownish oil cells lining veins abaxially. |
Racemes | erect, elongating in anthesis. |
erect, elongating in fruit. |
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 0.4–0.5 mm, glabrous inside; sepals 1–1.2 mm; petals yellow, fading pale lavender, 1–1.5 mm; stamens 4 (or 8), antisepalous, filaments 0.5 mm, anthers 0.5–0.7 mm, glabrous, when 8, then antipetalous ones smaller and abortive; style 1.5 mm, stigma surrounded by anthers at anthesis. |
Capsules | erect, clavate, 7–13 mm; pedicel 2–5 mm. |
spreading or reflexed, clavate, 4–10 mm; pedicel 3–9 mm. |
Seeds | 1–1.2 mm. |
0.8 mm. |
2n | = 14. |
= 14. |
Chylismia heterochroma |
Chylismia exilis |
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Phenology | Flowering May–Jun. | Flowering Apr–Jun. |
Habitat | Alluvial and rocky slopes. | Calcareous sand, gypseous clay flats, juniper woodlands. |
Elevation | 600–2200 m. (2000–7200 ft.) | 1000–1900 m. (3300–6200 ft.) |
Distribution |
CA; NV
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AZ; 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 exilis, known from Kane and San Juan counties in Utah and northern Coconino and Mohave counties in Arizona, is cryptic due to its small size. It may not be as rare as assumed, since it is difficult to spot in the field. P. H. Raven (1962, 1969) determined this species to be self-compatible and autogamous. (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 | Oenothera exilis, Camissonia exilis |
Name authority | (S. Watson) Small: Bull. Torrey Bot. Club 23: 193. (1896) — (as Chylisma) | (P. H. Raven) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 207. (2007) |
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