Chylismia walkeri |
Chylismia scapoidea |
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Walker's evening-primrose, Walker's sun-cup |
naked-stem beeblossom, Paiute suncup |
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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, strigillose, villous, or glandular puberulent. | ||||||||||||||||
Stems | slender, unbranched or branched from base, 10–60 cm. |
usually unbranched, sometimes branched from base, 3–45 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 poorly developed or absent, 1–18 × 0.5–3.5 cm; petiole 0.5–6.5 cm; blade pinnately lobed or lateral lobes greatly reduced or absent, sometimes mixed on same plant, terminal lobe narrowly ovate to ovate or elliptic, 1–6.5 × 0.5–3.3 cm, margins irregularly dentate to subentire, oil cells on abaxial surface inconspicuous or conspicuous, pale yellowish brown or dark brown. |
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Racemes | erect, elongating after anthesis. |
nodding, elongating in fruit. |
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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 with or without subapical free tips less than 1 mm; floral tube 1–4 mm, sparsely villous or glabrous inside; sepals 1.2–5 mm; petals bright yellow, often with red dots near base, fading pale yellow or yellowish orange, 1.5–5.5(–8) mm; stamens unequal, filaments of antisepalous stamens 1.2–6 mm, those of antipetalous ones 0.5–4 mm, anthers 1–2.5 mm, ciliate or glabrous; style 3–11 mm, stigma surrounded by anthers at anthesis. |
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Capsules | spreading or ascending, oblong-cylindrical, 11–45 mm; pedicel 5–30 mm. |
ascending, clavate, 8–50 mm; pedicel 4–20 mm. |
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Seeds | 0.6–1.2 mm. |
1–2 mm. |
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Chylismia walkeri |
Chylismia scapoidea |
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Distribution | sw United States
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w 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 4 (4 in the flora). P. H. Raven (1962, 1969) determined this species to be self-compatible 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 | 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 scapoidea, Camissonia scapoidea, O. brevipes var. scapoidea | ||||||||||||||||
Name authority | A. Nelson: Bot. Gaz. 56: 66. (1913) — (as Chylisma) | (Torrey & A. Gray) Nuttall ex Raimann in H. G. A. Engler and K. Prantl: Nat. Pflanzenfam. 96[III,7]: 217. (1893) | ||||||||||||||||
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