Show Lower Taxa
Difference between revisions of "Lasthenia sect. Ptilomeris"
Univ. Calif. Publ. Bot. 40: 75. 1966.
Basionym: Undefined sect. Ptilomeris Nuttall Trans. Amer. Philos. Soc., n. s. 7: 381. 1841
Synonyms: Baeria sect. Ptilomeris (Nuttall) H. M. Hall
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|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Baeriinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Baeriinae | ||
Latest revision as of 20:15, 5 November 2020
Annuals. Leaves usually pinnately lobed or pinnatifid, sometimes entire. Involucres hemispheric to obconic. Phyllaries falling with cypselae, distinct. Receptacles conic, smooth, muricate, or pitted, glabrous or hairy. Ray corollas yellow, laminae 1–10 mm, floral pigments remaining yellow in dilute aqueous alkali. Disc corolla lobes 5; anther appendages ovate to obovate; style apices ± deltate, glabrous or with apical tufts of hairs and subapical fringes of shorter hairs. Cypselae 1.5–3 mm; epappose or pappose. 2n = 8, 10.
Distribution
w North America, nw Mexico.
Discussion
Species 3 (3 in the flora).
Selected References
None.
Lower Taxa
Key
| 1 | Stems usually glandular-puberulent (herbage sweetly scented) | Lasthenia coronaria |
| 1 | Stems glabrous or hairy (at nodes and distally), or ± woolly (herbage not sweetly scented) | > 2 |
| 2 | Ray laminae 1–3 mm; pappi 0, or of 4–6(–12) aristate scales plus 4–5+ shorter, laciniate scales; coastal and offshore; British Columbia, California, Oregon, Washington | Lasthenia maritima |
| 2 | Ray laminae 4–8 mm; pappi 0, or of 2–3(–4) aristate scales plus 4–5+ shorter, fimbri-ate scales; coastal and inland; c California | Lasthenia minor |