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.
Click plate for higher resolution version.
Illustrator: Bee F. Gunn
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).

References

None.

Lower Taxa

No lower taxa listed.

AuthorL. D. Gottlieb +
AuthorityGottlieb +
Common nameSan Diego wirelettuce +
DistributionCalif. + and Mexico (Baja California). +
Elevation20–600 m +
HabitatOpen, pioneer sites such as old clearings, sand dunes, coastal sage communities, chaparral openings, and sandy roadside embankments +
IllustratorBee F. Gunn +
PhenologyFlowering Aug–Nov. +
Publication titleMadroño +
Publication year1972 +
ReferenceNone +
Source xmlhttps://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse grained fna xml/V19-20-21/V19 550.xml +
SynonymsUndefined tribe Lactuceae +
Taxon familyAsteraceae +
Taxon nameStephanomeria diegensis +
Taxon parentStephanomeria +
Taxon rankspecies +
VolumeVolume 19 +