Penstemon australis Beardtongue is a perennial herbaceous species.
Virgate, single-stemmed to bushy, perennial herbs with a mildly fetid odor; stems glabrous or pubescent. Leaves simple, unlobed, serrate or entire, those of the basal rosette petiolate, cauline leaves sessile, opposite, usually lanceolate. Inflorescence a panicle or thyrse. Sepals 5, free to base; corolla tubular, 2-lipped, the upper lip 2- lobed, the lower lip 3-lobed, throat inflated; fertile stamens 4, staminode pubescent; stigmas undivided, style 1. Capsule subconical; seeds angular, reticulate, usually ca. 1 mm in diam.