Chylismia walkeri
Walker's evening-primrose, Walker's sun-cup
slender, unbranched or branched from base, 10–60 cm.
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.
erect, elongating after 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.
spreading or ascending, oblong-cylindrical, 11–45 mm;
pedicel 5–30 mm.
0.6–1.2 mm.
Chylismia walkeri
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.)
1. Leaves primarily cauline, rarely forming inconspicuous basal rosette, lateral lobes usually greatly reduced or absent; petals 1–3 mm; anthers 0.5–0.8 mm. | subsp. walkeri |
1. Leaves primarily basal, forming conspicuous rosette, cauline reduced or absent, lateral lobes usually well developed; petals 2.8–6 mm; anthers 1–2 mm. | subsp. tortilis |
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