6. Camissoniopsis micrantha (Hornemmann ex Sprengel) W. L. Wagner & Hoch, Syst. Bot. Monogr. 83: 205. 2007.
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Oenothera micrantha Hornemann ex Sprengel, Syst. Veg. 2: 228. 1825; Camissonia micrantha (Hornemann ex Sprengel) P. H. Raven; Holostigma micranthum (Hornemann ex Sprengel) Spach; S. micranthum (Hornemann ex Sprengel) Walpers
Herbs annual, densely villous, more densely so distally, also rarely glandular puberulent distally. Stems arising from base, usually decumbent, rarely with 1 erect, 15–60 cm. Leaves 1–12 × 0.2–1.7 cm; petiole 0–2 cm, distal ones 0–0.5 cm; blade (basal) narrowly elliptic, (cauline) narrowly elliptic-lanceolate to lanceolate, base (basal) narrowly cuneate, (cauline) rounded, margins denticulate, apex acute. Flowers opening near sunrise; floral tube 1.2–2 mm; sepals 1–2.2(–2.5) mm; petals yellow, sometimes with 1 or 2 red dots near base, 1.5–3.5(–4.5) mm; episepalous filaments 0.8–1.5 mm, epipetalous filaments 0.5–0.8(–1) mm, anthers 0.4–0.6 mm, less than 5% of pollen grains 4- or 5-pored; style 2–3.5 mm, stigma surrounded by anthers at anthesis. Capsules straight or curved, equal to or slightly more than 1 complete spiral, subterete in living material, 4-angled when dry, 13–20(–25) × 1.1–1.2(–1.8) mm. Seeds 0.7–1.1 mm. 2n = 14.
Flowering (Jan–)Mar–Jun(–Sep). Coastal strand, coastal sage scrub, chaparral; 0–300(–800) m; Calif.
Camissoniopsis micrantha occurs from the vicinity of Bodega Bay, Sonoma County, near Lower Lake, Lake County, and near Rio Vista, Sacramento County, south in the Coast Ranges to the Los Angeles Basin and the northern edge of San Diego County; also on San Miguel, Santa Rosa, Santa Cruz, and Santa Catalina islands. The species was introduced, apparently on ballast heaps, at Nanaimo, Vancouver Island, British Columbia (Macoun s.n. in 1893, NMC). It has apparently not persisted in this area. P. H. Raven (1969) determined C. micrantha to be self-compatible and primarily autogamous. Excluded populations are now recognized as C. hirtella, C. ignota, C. lewisii, and C. pallida.
Oenothera hirta Link (1821), not Linnaeus (1759), is an illegitimate name that pertains to Camissoniopsis micrantha.
