Holocarpha virgata

(A. Gray) D. D. Keck
Aliso 4: 111. 1958.
IllustratedEndemic
Basionym: Hemizonia virgata A. Gray in W. H. Emory, Rep. U.S. Mex. Bound. 2(1): 100. 1859
Treatment appears in FNA Volume 21. Treatment on page 288. Mentioned on page 287.
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Plants 20–120 cm.; stems usually notably stipitate-glandular, rarely merely ± resinous distally. Heads borne singly (at ends of branches) or in ± racemiform to spiciform arrays. Involucres ± obconic to campanulate. Phyllaries each bearing 5–20 gland-tipped processes and glabrous or minutely sessile- or stipitate-glandular. Ray florets 3–7. Disc florets 9–25; anthers reddish to dark purple. 2n = 8.

Discussion

Subspecies 2 (2 in the flora).

Holocarpha virgata occurs widely in the Great Valley and bordering foothills of the Coast Ranges and Sierra Nevada in northern and central California (subsp. virgata); it is disjunct in southwestern California (e.g., subsp. elongata near San Diego). Different populations are often intersterile and distinguished by chromosomal rearrangements.

Selected References

None.

Key

1 Stem branches ± gracile, ± pliable; peduncles 0–5(–15) cm Holocarpha virgata subsp. elongata
1 Stem branches ± virgate, ± rigid; peduncles 0–5+cm Holocarpha virgata subsp. virgata