Penstemon angustifolius var. caudatus (A.Heller) Rydb.

Floras and Monographs

Penstemon angustifolius var. caudatus (A.Heller) Rydb.: [Article] Pavlik, Bruce M. & Barbour, Michael G. 1988. Demographic monitoring of endemic sand dune plants, Eureka Valley, California. Biol. Conserv. 46: 217-242.

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