familyPlantaginaceae
genusPenstemon
subgenusPenstemon subg. Penstemon
sectionPenstemon sect. Penstemon
speciesPenstemon rydbergii
Difference between revisions of "Penstemon rydbergii var. aggregatus"
Brittonia 31: 106. 1979.
Endemic
Basionym: Penstemon aggregatus Pennell Contr. U.S. Natl. Herb. 20: 367. 1920
Synonyms: P. rydbergii subsp. aggregatus (Pennell) D. D. Keck
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Latest revision as of 20:32, 5 November 2020
Stems ± retrorsely hairy. Thyrses: axis glabrous or retrorsely hairy; proximal bract margins entire. Flowers: calyx lobes (4.5–)5–8 × 1.5–2.5 mm, margins erose, rarely lacerate, narrowly to broadly scarious, apex acute to acuminate; corolla (10–)13–20 mm; pollen sacs (0.6–)0.8–1.1 mm. 2n = 32.
Phenology: Flowering Jun–Aug.
Habitat: Sagebrush shrublands, aspen woodlands.
Elevation: 1800–3200 m.
Distribution
Ariz., Colo., Idaho, Mont., Utah, Wyo.
Discussion
Variety aggregatus is known from the Rocky Mountains from central Idaho and western Montana to north-central and western Wyoming, north-central Colorado, and central Utah. The variety is sympatric with var. rydbergii in north-central Colorado and south-central Wyoming; some plants from that area are difficult to assign to variety with confidence.
Selected References
None.
Lower Taxa
None.