Chylismia eastwoodiae |
Chylismia walkeri |
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Walker's evening-primrose, Walker's sun-cup |
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Habit | Herbs annual, succulent, glabrous, glandular puberulent, or villous proximally. | Herbs annual or short-lived perennial, villous, usually densely so proximally, less dense to glabrate distally, sometimes hairs somewhat appressed and shorter on leaves, also sometimes glandular puberulent on distal parts. | ||||
Stems | unbranched or branched from base, 3–30 cm. |
slender, unbranched or branched from base, 10–60 cm. |
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Leaves | 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. |
in basal rosette and/or cauline, often purple-dotted, 2–22 × 0.4–3.5 cm; petiole 0.4–8 cm; blade pinnately lobed, sometimes lateral lobes greatly reduced or absent and blade reduced to terminal lobe only, terminal lobe oblong or cordate to ovate, 1–5 × 0.5–3.2 cm, margins serrate, brown oil cells prominently lining veins abaxially. |
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Racemes | nodding, elongating after anthesis. |
erect, elongating after anthesis. |
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Flowers | 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. |
opening at sunrise; buds individually reflexed, with apical free tips less than 1 mm; floral tube 0.5–1.5 mm, glabrous or sparsely villous inside; sepals 1.5–5 mm; petals bright yellow, fading pale orange or lavender, 1–6 mm; stamens unequal, filaments of antisepalous stamens 1–3 mm, those of antipetalous ones 0.3–2 mm, anthers 0.5–2 mm, glabrous or sparsely ciliate; style 1.5–6 mm, stigma surrounded by anthers at anthesis. |
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Capsules | erect, spreading, or slightly reflexed, clavate, 18–40 mm; pedicel 4–28 mm. |
spreading or ascending, oblong-cylindrical, 11–45 mm; pedicel 5–30 mm. |
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Seeds | 1.2–1.7 mm. |
0.6–1.2 mm. |
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2n | = 14. |
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Chylismia eastwoodiae |
Chylismia walkeri |
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Phenology | Flowering Apr–Jun. | |||||
Habitat | Clay flats, on gray, alkaline, marine-deposited gumbo, sandy draws. | |||||
Elevation | 1200–1800 m. (3900–5900 ft.) | |||||
Distribution |
CO; UT |
sw United States
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Discussion | 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.) |
Subspecies 2 (2 in the flora). P. H. Raven (1962, 1969) determined this species to be self-incompatible and primarily autogamous. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 10. | FNA vol. 10. | ||||
Parent taxa | ||||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Oenothera scapoidea var. eastwoodiae, Camissonia eastwoodiae, O. eastwoodiae | Camissonia walkeri, Oenothera walkeri | ||||
Name authority | (Munz) W. L. Wagner & Hoch: Syst. Bot. Monogr. 83: 207. (2007) | A. Nelson: Bot. Gaz. 56: 66. (1913) — (as Chylisma) | ||||
Web links |