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Stems glabrous. Leaves: petiole glabrous; blade margins not rev­olute, not ciliate, surfaces gla­brous. Calyces glabrous (sepal margins seldom sparsely ciliate or rarely papillate).


Phenology: Flowering spring(–summer); fruiting (spring–)summer(–fall).
Habitat: Dry, rocky hills, mesas, scrub, limestone flats, roadsides, generally on limestone.
Elevation: 900–1500 m.

Distribution

N.Mex., Tex., Mexico (Coahuila).

Discussion

Selected References

None.

Lower Taxa

None.
Linh Tõ Ngô +  and Wendy L. Applequist +
Torrey in W. H. Emory +
Amsonia sect. Sphinctosiphon +
N.Mex. +, Tex. +  and Mexico (Coahuila). +
900–1500 m. +
Dry, rocky hills, mesas, scrub, limestone flats, roadsides, generally on limestone. +
Flowering spring(–summer) +  and fruiting (spring–)summer(–fall). +
Rep. U.S. Mex. Bound. +
Amsonia longiflora var. longiflora +
Amsonia longiflora +
variety +