Penstemon angustifolius var. caudatus

(A. Heller) Rydberg

Bull. Torrey Bot. Club 33: 151. 1906. (as Pentstemon)

IllustratedEndemic
Basionym: Penstemon caudatus A. Heller Minnesota Bot. Stud. 2: 34. 1898
Treatment appears in FNA Volume 17. Treatment on page 115. Mentioned on page 114.

Stems (10–)15–60(–65) cm, glabrous, rarely scabrous. Cauline leaves 3–8 pairs, blade ovate to lanceolate. Thyrses: proximal bracts ovate to lanceolate. Flowers: corolla blue, rarely lavender or pink, 13–20(–22) mm. 2n = 16.


Phenology: Flowering May–Jun.
Habitat: Sandy or gravelly soils, shortgrass prairies, sagebrush shrublands.
Elevation: 1200–2600 m.

Distribution

Colo., Kans., Nebr., N.Mex., Okla., S.Dak., Wyo.

Discussion

Variety caudatus is known from the southwestern Great Plains. While mostly distinct in the southern and central parts of its range, the variety passes into var. angustifolius in northeastern Colorado and western Nebraska.

Selected References

None.

Lower Taxa

None.
Craig C. Freeman +
(A. Heller) Rydberg +
Penstemon caudatus +
Colo. +, Kans. +, Nebr. +, N.Mex. +, Okla. +, S.Dak. +  and Wyo. +
1200–2600 m. +
Sandy or gravelly soils, shortgrass prairies, sagebrush shrublands. +
Flowering May–Jun. +
Bull. Torrey Bot. Club +
Illustrated +  and Endemic +
Penstemon angustifolius var. caudatus +
Penstemon angustifolius +
variety +