Stephanomeria diegensis

Gottlieb

Madroño 21: 476, figs. 2,3. 1972.

Common names: San Diego wirelettuce
Treatment appears in FNA Volume 19. Treatment on page 352. Mentioned on page 351, 353.
Revision as of 18:37, 24 September 2019 by FNA>Volume Importer

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. +
Undefined tribe Lactuceae +
Stephanomeria diegensis +
Stephanomeria +
species +