Chylismia walkeri |
Chylismia walkeri subsp. walkeri |
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Walker's evening-primrose, Walker's sun-cup |
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Habit | 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 | slender, unbranched or branched from base, 10–60 cm. |
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Leaves | 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. |
primarily cauline, rarely forming basal rosette; blade with only terminal lobe well developed, sometimes pinnately lobed, lateral lobes usually greatly reduced or absent. |
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Racemes | erect, elongating after anthesis. |
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Flowers | 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. |
floral tube 0.5–1.3 mm; sepals 1.5–2 mm; petals 1–3 mm; anthers 0.5–0.8 mm, glabrous; style 1.5–4 mm. |
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Capsules | spreading or ascending, oblong-cylindrical, 11–45 mm; pedicel 5–30 mm. |
pedicel 5–15 mm. |
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Seeds | 0.6–1.2 mm. |
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2n | = 14, 28. |
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Chylismia walkeri |
Chylismia walkeri subsp. walkeri |
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Phenology | Flowering Apr–Jun. | |||||
Habitat | Loose slides of limestone and other sedimentaries, sandy washes. | |||||
Elevation | 900–1800 m. (3000–5900 ft.) | |||||
Distribution | sw United States
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AZ; CO; NM; UT |
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Discussion | 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.) |
Subspecies walkeri is nearly confined to the Colorado Plateau, known from Mesa County, Colorado, and Emery County, Utah, south to Montezuma County, Colorado, San Juan County, New Mexico, and central Coconino and northeastern Mohave counties, Arizona. (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 | Onagraceae > subfam. Onagroideae > tribe Onagreae > Chylismia > sect. Chylismia | Onagraceae > subfam. Onagroideae > tribe Onagreae > Chylismia > sect. Chylismia > Chylismia walkeri | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | Camissonia walkeri, Oenothera walkeri | Camissonia bolanderin., C. dominguezescalanteorum, Oenothera multijuga var. orientalis | ||||
Name authority | A. Nelson: Bot. Gaz. 56: 66. (1913) — (as Chylisma) | unknown | ||||
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