Lasthenia sect. Amphiachaenia
entire or ± toothed.
campanulate to depressed-hemispheric, hemispheric, or obconic.
narrowly conic to conic (subulate in L. leptalea), muricate or papillate, glabrous.
bright yellow, laminae 2.5–16 mm, floral pigments turning deep red in dilute aqueous alkali.
lobes 5;
anther appendages deltate to sublanceolate or subulate (broadened distal to bases);
style apices ± deltate with apical tufts of hairs and subapical fringes of shorter hairs.
± persistent or falling with cypselae, distinct.
to 4 mm;
epappose or pappose.
= 16, 32, 48.
Lasthenia sect. Amphiachaenia
Species 4 (4 in the flora).
Perennial lasthenias are found only in sect. Amphiachaenia. Epappose plants of sect. Amphiachaenia are more likely to be found in coastal populations and may constitute entire local populations.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Stems glabrous proximally, villous distally; phyllaries usually 4–6, glabrous but for apices; receptacles subulate, papillate; anther appendages subulate; interior w California | L. leptalea |
1. Stems ± hairy throughout, sometimes more so distally; phyllaries 4–16, hairy; receptacles conic, muricate; anther appendages deltate to sublanceolate; Arizona, California, Oregon | → 2 |
2. Perennials; coastal Oregon | L. ornduffii |
2. Annuals or perennials; coastal or inland Arizona, California, Oregon | → 3 |
3. Annuals; leaves entire; pappi usually of (2–)4(–6) opaque, white (aging to brown), ovate-lanceolate, aristate scales, sometimes 0; Arizona, California (includingChannel Islands) | L. gracilis |
3. Annuals or perennials (if perennial, only in coastal California); leaves entire or with 3–5+ teeth; pappi 0, or of 1–7 translucent (rarely opaque), brown (rarely white), linear to subulate, aristate scales; n California, s Oregon | L. californica |
