Holocarpha obconica

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

Aliso 4: 111. 1958.

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


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


Lower Taxa