1. Camissoniopsis cheiranthifolia (Hornemann ex Sprengel) W. L. Wagner & Hoch, Syst. Bot. Monogr. 83: 204. 2007.
[F]
Oenothera cheiranthifolia Hornemann ex Sprengel, Syst. Veg. 2: 228. 1825; Agassizia cheiranthifolia (Hornemann ex Sprengel) Spach; Camissonia cheiranthifolia (Hornemann ex Sprengel) Raimann; Holostigma cheiranthifolium (Hornemann ex Sprengel) Spach; Sphaerostigma cheiranthifolium (Hornemann ex Sprengel) Fischer &C. A. Meyer
Herbs short-lived perennial, sometimes woody at base, usually densely strigillose throughout, rarely glabrous, also villous distally. Stems prostrate, decumbent, or ascending from base, to 60(–130) cm. Leaves 0.5–5 × 0.3–2.2 cm; petiole 0–1.5(–2.5) cm, distal ones to 1 cm; blade narrowly ovate, base attenuate, cuneate, or cordate, margins sparsely serrulate, apex acute. Flowers opening near sunrise; floral tube 2.1–8.5 mm; sepals 4–11.5 mm; petals yellow, often red-dotted near base, 6–20 mm; episepalous filaments 2.8–8 mm, epipetalous filaments 1.5–6 mm, anthers 1–3 mm, less than 5% of pollen grains 4- or 5-pored; style 6–23 mm, stigma surrounded by or exserted beyond anthers at anthesis. Capsules often coiled in 1–2 spirals, 4-angled, 10–25 × 2–2.5 mm. Seeds 1.2–1.3 mm.
Subspecies 2 (2 in the flora): w United States, nw Mexico.
Camissoniopsis cheiranthifolia occurs on slopes and dunes along the immediate coast and on islands from Coos Bay, Curry County, Oregon, to the vicinity of San Quintín, Baja California; it is also known from the east shore of San Francisco Bay and locally on sand dunes along the lower Sacramento River, California, 0–100 m. P. H. Raven (1969) determined C. cheiranthifolia to be self-incompatible (some populations in subsp. Suffruticosa) or self-compatible (both subspecies) and apparently pollinated by oligolectic bees of Andrena subg. Onagrandrena (Raven); Raven subdivided the species into two intergrading subspecies.
