Lasthenia sect. Ptilomeris

(Nuttall) Ornduff

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
Treatment appears in FNA Volume 21. Treatment on page 346. Mentioned on page 337, 344.

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.

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
ovate +  and obovate +
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +, glomerate +  and corymbiform +
indeterminate +  and determinate +
Raymund Chan +  and Robert Ornduff† +
(Nuttall) Ornduff +
decurrent +
Undefined sect. Ptilomeris +
compound +  and simple +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
yellow +  and orangish +
pappose +  and epappose +
hairy +  and glabrous +
4 +  and 18 +
papillate +
usually cylindric +  and obovoid +
fertile +  and bisexual +
fertile +  and bisexual +
w North America +  and nw Mexico +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
in more or less corymbiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
hemispheric;obconic +
0.1 cm1 mm <br />0.001 m <br /> (1 cm10 mm <br />0.01 m <br />) +
sessile +  and petiolate +
pinnatifid;lobed +
papillate +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
2-carpellate +
persistent +
of 1 +  and 12+ aristate +
aristate +, truncate +, laciniate +  and fimbriate +
scarious-margined +
weakly +  and flat +
glabrous +, glabrate +, woolly +  and tomentose +
3 +  and 18 +
Univ. Calif. Publ. Bot. +
hairy +  and glabrous +
pitted +, muricate +  and smooth +
exalbuminous +
branched +  and simple +
sprawling +, prostrate +  and decumbent +
appendaged +  and truncate +
with apical tufts +  and glabrous +
hirsutulous +  and glabrous +
papillate +
Baeria sect. Ptilomeris +
Lasthenia sect. Ptilomeris +
Lasthenia +
section +
campanulate +
toothed +  and entire +
40 cm400 mm <br />0.4 m <br /> (60 cm600 mm <br />0.6 m <br />) +
0 cm0 mm <br />0 m <br /> (40 cm400 mm <br />0.4 m <br />) +
shrub +  and subshrub +