Stephanomeria diegensis

Gottlieb

Madroño 21: 476, figs. 2,3. 1972

Common names: San Diego wirelettuce
Illustrated
Treatment appears in FNA Volume 19. Treatment on page 352. Mentioned on page 351, 353.

Annuals, 50–200 cm. Stems single, branches ascending or spreading, glabrous. Leaves withered at flowering (glabrous); basal blades linear to oblanceolate, runcinate, 3–10 cm, margins pinnately lobed; cauline much reduced, bractlike. Heads borne singly or clustered along branches. Peduncles 3–4 mm. Calyculi of reflexed bractlets. Involucres 7–9 mm (sparsely glandular-puberulent). Florets 11–13. Cypselae light tan to brown, 1.9–2.3 mm, faces smooth, slightly bumpy or tuberculate, grooved; pappi of 19–21, white bristles (falling), plumose on distal 80–85%. 2n = 16.


Phenology: Flowering Aug–Nov.
Habitat: Open, pioneer sites such as old clearings, sand dunes, coastal sage communities, chaparral openings, and sandy roadside embankments
Elevation: 20–600 m

Distribution

V19-550-distribution-map.gif

Calif., Mexico (Baja California).

Discussion

The morphologic characteristics of Stephanomeria diegensis are a combination of those of S. exigua and S. virgata, and the species is thought to have evolved from genetic segregates of their hybridization (L. D. Gottlieb 1971; G. P. Gallez and Gottlieb 1982).

Selected References

None.

Lower Taxa

None.

... more about "Stephanomeria diegensis"
L. D. Gottlieb +
Gottlieb +
San Diego wirelettuce +
Calif. +  and Mexico (Baja California). +
20–600 m +
Open, pioneer sites such as old clearings, sand dunes, coastal sage communities, chaparral openings, and sandy roadside embankments +
Flowering Aug–Nov. +
Illustrated +
Undefined tribe Lactuceae +
Stephanomeria diegensis +
Stephanomeria +
species +