Chylismia walkeri |
Chylismia brevipes |
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Walker's evening-primrose, Walker's sun-cup |
golden suncup, Mojave suncup, yellow cups |
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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. | Herbs annual, moderately to densely villous, sometimes strigillose. | ||||||||||||
Stems | slender, unbranched or branched from base, 10–60 cm. |
branched, 3–75 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 in basal rosette, cauline greatly reduced when present, 6–14 × 1.5–3.5 cm; petiole 1.5–4(–11) cm; blade pinnately lobed or lateral lobes greatly reduced or absent, often mixed on same plant, terminal lobe usually ovate, rarely elliptic, 2.5–6.9 × 1.5–7 cm, margins irregularly dentate, oil cells on abaxial surface inconspicuous. |
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Racemes | erect, elongating after anthesis. |
nodding, mostly elongating after flowers. |
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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. |
opening at sunrise; buds sometimes individually reflexed, without free tips or with subapical free tips 1–2 mm, or with minute, apical free tips less than 1 mm; floral tube 3–8 mm, densely short-villous inside proximally; sepals 5–9 mm; petals bright yellow, sometimes with red dots at base, fading yellow to orange or reddish, 3–18 mm; stamens subequal, filaments 3–6 mm, anthers 2.5–6 mm, ciliate; style 10–18 mm, stigma exserted beyond anthers at anthesis. |
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Capsules | spreading or ascending, oblong-cylindrical, 11–45 mm; pedicel 5–30 mm. |
ascending or spreading, oblong-cylindrical, 18–92 mm; pedicel 2–20 mm. |
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Seeds | 0.6–1.2 mm. |
1–1.5 mm. |
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Chylismia walkeri |
Chylismia brevipes |
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Distribution | sw United States
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sw United States
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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 3 (3 in the flora). P. H. Raven (1962, 1969) determined this species to be self-incompatible. (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 | ||||||||||||
Sibling taxa | ||||||||||||||
Subordinate taxa | ||||||||||||||
Synonyms | Camissonia walkeri, Oenothera walkeri | Oenothera brevipes, Camissonia brevipes | ||||||||||||
Name authority | A. Nelson: Bot. Gaz. 56: 66. (1913) — (as Chylisma) | (A. Gray) Small: Bull. Torrey Bot. Club 23: 194. (1896) — (as Chylisma) | ||||||||||||
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