Lasthenia platycarpha

(A. Gray) Greene

Man. Bot. San Francisco, 205. 1894.

Common names: Alkali goldfields
Endemic
Basionym: Burrielia platycarpha A. Gray in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 97. 1859
Synonyms: Baeria platycarpha (A. Gray) A. Gray
Treatment appears in FNA Volume 21. Treatment on page 346. Mentioned on page 336.

Annuals, to 30 cm. Stems erect, branched proximally, glabrous or woolly to villous, especially distally. Leaves linear, 10–60 × 1–2+ mm (simple blades or single lobes), margins usually lobed, sometimes entire, faces glabrous or hairy. Involucres obconic, 6–8 mm. Phyllaries 6–9, elliptic to ovate, glabrous or villous. Receptacles conic, muricate, glabrous or sparsely hairy. Ray-florets 6–13; laminae elliptic, 7–8 mm. Anther appendages deltate. Cypselae black to gray, narrowly clavate, 1.5–3.5 mm, hairy; pappi of 4–6 white or yellowish, lanceolate to ovate, aristate scales. 2n = 8.


Phenology: Flowering Mar–Apr.
Habitat: Alkali flats
Elevation: 0–100+ m

Discussion

Lasthenia platycarpha is known only from highly saline soils and is frequently found with species of sects. Hologymne and Ornduffia, particularly L. fremontii. In the northern part of its range, L. platycarpha is more robust and has longer pappus scales and more densely pubescent peduncles. Plants with entire leaves resemble species of sect. Amphiachaenia; L. platycarpha does not have anthochlor pigments that turn red in aqueous alkali.

Selected References

None.

Lower Taxa

None.
... more about "Lasthenia platycarpha"
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† +
(A. Gray) Greene +
decurrent +
Burrielia platycarpha +
compound +  and simple +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Alkali goldfields +
yellow +  and orangish +
black +  and gray +
4 +  and 18 +
papillate +
fertile +  and bisexual +
fertile +  and bisexual +
0–100+ m +
hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Alkali flats +
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 />) +
0.6 cm6 mm <br />0.006 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
0.7 cm7 mm <br />0.007 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
sessile +  and petiolate +
10mm;60mm +
0.1 cm1 mm <br />0.001 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
papillate +
deltate +
2-carpellate +
persistent +
of 1 +  and 12+ aristate +
aristate +, truncate +, laciniate +  and fimbriate +
Flowering Mar–Apr. +
scarious-margined +
weakly +  and flat +
villous +  and glabrous +
Man. Bot. San Francisco, +
hairy +  and glabrous +
yellowish;white +
4 +  and 6 +
aristate +, lanceolate +  and ovate +
exalbuminous +
sprawling +, prostrate +  and decumbent +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Baeria platycarpha +
Lasthenia platycarpha +
Lasthenia sect. Platycarpha +
species +
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 /> (30 cm300 mm <br />0.3 m <br />) +
shrub +  and subshrub +