Holocarpha obconica

(J. C. Clausen & D. D. Keck) D. D. Keck

Aliso 4: 111. 1958.

Endemic
Basionym: Hemizonia obconica J. C. Clausen & D. D. Keck Madroño 3: 7. 1935
Synonyms: Hemizonia vernalis D. D. Keck Holocarpha obconica subsp. autumnalis D. D. Keck
Treatment appears in FNA Volume 21. Treatment on page 288. Mentioned on page 287.

Plants 10–80 (–120) cm; stems ± resinous distally (not notably stipitate-glandular). Heads in corymbiform or paniculiform arrays. Involucres ± obconic to ± globose. Phyllaries each bearing (0–) 5–15 (–20) gland-tipped processes and usually glabrous or minutely sessile or stipitate-glandular (rarely ± hispid). Ray-florets 4–9. Disc-florets 11–21; anthers yellow to brownish. 2n = 12.


Phenology: Flowering Apr–Nov.
Habitat: Grasslands, savannas
Elevation: 10–500 m

Discussion

Holocarpha obconica ranges from the eastern San Francisco Bay area and northwest San Joaquin Valley to the Inner South Coast Ranges and is disjunct in western foothills of the southern Sierra Nevada. Often, H. obconica occurs with or near H. heermannii or H. virgata. Crossing studies have shown that different populations of H. obconica retain high interfertility; crosses to other species of Holocarpha have failed or yielded sterile hybrids (J. Clausen 1951).

Selected References

None.

Lower Taxa

None.
... more about "Holocarpha obconica"
not tailed +, rounded +  and obtuse +
yellow +  and brownish +
pale +  and dark +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +  and corymbiform +
indeterminate +  and determinate +
Bruce G. Baldwin +  and John L. Strother +
(J. C. Clausen & D. D. Keck) D. D. Keck +
decurrent +
Hemizonia obconica +
compound +  and simple +
linear to linear-elliptic +
linear;oblanceolate +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
hairy +  and glabrous +
fusiform +, clavate +, obpyramidal +, terete +, compressed +  and obcompressed +
fertile +  and bisexual +
fertile +  and bisexual +
10–500 m +
hirsute +  and strigose sericeous or villous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Grasslands, savannas +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
less obconic;more or less globose +
petiolate +  and sessile +
alternate +  and opposite +
deltate +
entire +, serrate +  and serrulate +
2-carpellate +
persistent +
Flowering Apr–Nov. +
stipitate-glandular +  and glabrous +
3 +  and 16 +
alternate +  and opposite +
obcompressed +
flat;convex +
exalbuminous +
resinous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Hemizonia vernalis +  and Holocarpha obconica subsp. autumnalis +
Holocarpha obconica +
Holocarpha +
species +
cylindric +
toothed +  and entire +
10 cm100 mm <br />0.1 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +