Chylismia heterochroma |
Chylismia eastwoodiae |
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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, succulent, glabrous, glandular puberulent, or villous proximally. |
Stems | several, 10–100 cm. |
unbranched or branched from base, 3–30 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 in basal rosette and also cauline; petiole 0.5–8 cm; blade usually not pinnately lobed or, if so, then lateral lobes greatly reduced, terminal lobe oblanceolate to cordate, 0.8–7.5 × 0.4–3 cm, margins entire or sparsely denticulate, pale brown oil cells lining veins abaxially. |
Racemes | erect, elongating in anthesis. |
nodding, elongating after anthesis. |
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 subapical free tips; floral tube 2–4.5 mm, villous inside proximally; sepals 3–8 mm; petals bright yellow, with red dots near base, fading pale yellow or yellowish orange, 5.5–9 mm; stamens unequal, filaments of antisepalous stamens 3–8 mm, those of antipetalous ones 2.8–5.5 mm, anthers 2–4 mm, ciliate; style 10–17 mm, stigma exserted beyond anthers at anthesis. |
Capsules | erect, clavate, 7–13 mm; pedicel 2–5 mm. |
erect, spreading, or slightly reflexed, clavate, 18–40 mm; pedicel 4–28 mm. |
Seeds | 1–1.2 mm. |
1.2–1.7 mm. |
2n | = 14. |
= 14. |
Chylismia heterochroma |
Chylismia eastwoodiae |
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Phenology | Flowering May–Jun. | Flowering Apr–Jun. |
Habitat | Alluvial and rocky slopes. | Clay flats, on gray, alkaline, marine-deposited gumbo, sandy draws. |
Elevation | 600–2200 m. (2000–7200 ft.) | 1200–1800 m. (3900–5900 ft.) |
Distribution |
CA; NV
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CO; 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 eastwoodiae is known from Mesa County, Colorado, and from Emery County south to San Juan County, Utah. P. H. Raven (1962, 1969) suspected this species to be self-incompatible, but did not have data to make the determination. (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 scapoidea var. eastwoodiae, Camissonia eastwoodiae, O. eastwoodiae |
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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