Layia pentachaeta subsp. pentachaeta

Endemic
Treatment appears in FNA Volume 21. Treatment on page 267.

Ray corollas yellow. 2n = 16.


Phenology: Flowering Mar–Jun.
Habitat: Grass-lands, openings in woodlands, chaparral, sandy or clayey soils, sometimes serpentine
Elevation: 100–1200 m

Discussion

Subspecies pentachaeta occurs in the Sierra Nevada foothills north of the Tehachapi Range and in the San Joaquin Valley and South Inner Coast Ranges. Putative hybrids with Layia pentachaeta subsp. albida have been collected in the southern Sierra Nevada (e.g., Keck 3258 in UC); artificial, highly fertile hybrids of the same combination have been produced; (J. Clausen 1951).

Selected References

None.

Lower Taxa

None.
not tailed +, rounded +  and obtuse +
yellow +  and brownish +
pale +  and dark +
connate +  and distinct +
shorter or longer +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
umbelliform +, spiciform +, paniculiform +, glomerulate +  and corymbiform +
indeterminate +  and determinate +
Bruce G. Baldwin +, Susan J. Bainbridge +  and John L. Strother +
A. Gray in War Department [U.S.] +
decurrent +
0.6 cm6 mm <br />0.006 m <br /> (11 cm110 mm <br />0.11 m <br />) +
lanceolate +  and linear +
compound +  and simple +
linear to linear-elliptic +
1-2-pinnatifid;oblanceolate;linear +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
yellow +, bicolored +, white +  and cream +
0.3 cm3 mm <br />0.003 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
hairy +  and glabrous +
fusiform +, clavate +, obpyramidal +, terete +, compressed +  and obcompressed +
fertile +  and bisexual +
fertile +  and bisexual +
100–1200 m +
hirsute +  and strigose +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Grass-lands, openings in woodlands, chaparral, sandy or clayey soils, sometimes serpentine +
in more or less corymbiform arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.2 cm2 mm <br />0.002 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
hemispheric +
0.2 cm2 mm <br />0.002 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
white +  and yellow +
0.3 cm3 mm <br />0.003 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
petiolate +  and sessile +
alternate +  and opposite +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
1-2-pinnatifid +
2-carpellate +
persistent +
of 1 +  and 32 elliptic +
subulate +, setiform +, ovate +  and lance-attenuate +
Flowering Mar–Jun. +
4 +  and 14 +
alternate +  and opposite +
in War Department [U.S.], Pacif. Railr. Rep. +
clavate +  and obcompressed +
flat;convex +
1 +  and 22 +
setiform +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
exalbuminous +
not purple-streaked +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Compositae +
Layia pentachaeta subsp. pentachaeta +
Layia pentachaeta +
subspecies +
cylindric +
entire +  and toothed +
60 cm600 mm <br />0.6 m <br /> (130 cm1,300 mm <br />1.3 m <br />) +
2 cm20 mm <br />0.02 m <br /> (60 cm600 mm <br />0.6 m <br />) +
acrid-scented +