Asclepias asperula subsp. asperula

Synonyms: Asclepias capricornu subsp. occidentalis Woodson
Treatment appears in FNA Volume 14.

Leaves blades linear-lanceolate to linear, 7.7–17 × 0.4–3.6 cm, apex attenuate. Peduncles 0–22.5 cm. Corona segments red­dish purple with white upper margin, 5–7 mm. Follicles (6–)8–11.5 cm, ribs rarely inconspic­uously muricate near apex or not at all. Seeds 6–8 × 5–6 mm.


Phenology: Flowering Mar–Sep(–Oct); fruiting (Apr–)May–Sep(–Oct).
Habitat: Slopes, hillsides, mesas, ridge tops, bajadas, canyons, arroyos, streamsides, lakesides, basalt, granite, limestone, shale, sandstone, alluvium, talus, rocky, gravelly, clay, sand, and silt soils, grasslands, pinyon-juniper, oak, juniper, pine, pine-oak, mixed conifer, and mesquite woodlands, chaparral, riparian areas, desert scrub.
Elevation: 700–2800 m.

Distribution

Ariz., Calif., Colo., Idaho, Nev., N.Mex., Okla., Tex., Utah, Mexico.

Discussion

Although subsp. asperula is uncommon in Mexico, it ranges surprisingly far south, to Oaxaca. In the flora area, subsp. asperula has limited distributions in California (San Bernardino County), Idaho (Franklin County), Oklahoma (Cimarron County), and Texas (trans-Pecos region).

Selected References

None.

Lower Taxa

None.
Mark Fishbein +
(Decaisne) Woodson +
Acerates asperula +
Ariz. +, Calif. +, Colo. +, Idaho +, Nev. +, N.Mex. +, Okla. +, Tex. +, Utah +  and Mexico. +
700–2800 m. +
Slopes, hillsides, mesas, ridge tops, bajaSlopes, hillsides, mesas, ridge tops, bajadas, canyons, arroyos, streamsides, lakesides, basalt, granite, limestone, shale, sandstone, alluvium, talus, rocky, gravelly, clay, sand, and silt soils, grasslands, pinyon-juniper, oak, juniper, pine, pine-oak, mixed conifer, and mesquite woodlands, chaparral, riparian areas, desert scrub., chaparral, riparian areas, desert scrub. +
Flowering Mar–Sep(–Oct) +  and fruiting (Apr–)May–Sep(–Oct). +
Ann. Missouri Bot. Gard. +
Asclepias capricornu subsp. occidentalis +
Asclepias asperula subsp. asperula +
Asclepias asperula +
subspecies +