Asclepias asperula subsp. capricornu

(Woodson) Woodson

Ann. Missouri Bot. Gard. 41: 195. 1954.

Endemic
Basionym: Asclepias capricornu Woodson Ann. Missouri Bot. Gard. 32: 370. 1945
Synonyms: Acerates decumbens (Nuttall) Decaisne Anantherix decumbens Nuttall Asclepias asperula var. decumbens (Nuttall) Shinners Asclepiodora decumbens (Nuttall) A. Gray
Treatment appears in FNA Volume 14.

Leaves blades lanceolate, 5–14.5 × 0.7–3.7 cm, apex acute to attenuate. Peduncles 0–6.8 cm. Corona segments white, reddish purple dorsally, 4.5–6 mm. Follicles 6–9(–11.5) cm, ribs sparsely to densely muricate for most of length. Seeds 5–7 × 4–5 mm.


Phenology: Flowering Mar–Sep(–Nov); fruiting Apr–Sep(–Nov).
Habitat: Hills, slopes, ridge tops, plains, streambanks, dunes, pastures, fields, limestone, sandstone, gypsum, igneous substrates, rocky, clay, calcareous, and sandy soils, prairies, shrubby grasslands, oak-juniper, juniper, and oak woodlands.
Elevation: 50–1200 m.

Discussion

Subspecies capricornu is considered to be of conser­vation concern in Nebraska, where it has been recorded only at a single location in Nuckolls County.

Selected References

None.

Lower Taxa

None.
Mark Fishbein +
(Woodson) Woodson +
Asclepias capricornu +
Kans. +, Nebr. +, Okla. +  and Tex. +
50–1200 m. +
Hills, slopes, ridge tops, plains, streambanks, dunes, pastures, fields, limestone, sandstone, gypsum, igneous substrates, rocky, clay, calcareous, and sandy soils, prairies, shrubby grasslands, oak-juniper, juniper, and oak woodlands. +
Flowering Mar–Sep(–Nov) +  and fruiting Apr–Sep(–Nov). +
Ann. Missouri Bot. Gard. +
Acerates decumbens +, Anantherix decumbens +, Asclepias asperula var. decumbens +  and Asclepiodora decumbens +
Asclepias asperula subsp. capricornu +
Asclepias asperula +
subspecies +