1a) Tip of distal leaves sharply acuminate or sharp-tipped
2a) Leaf surfaces moderately to densely glandular-villous, margins glandular-puberulent to glandular-villous. Stems 3-24 cm, usually simple or few-branched; Calyces 7-12 mm; corolla tube-throat 13-16 mm, limb 14-26 mm wide, capsules 10-17 mm, usually exceeding calyx .........Diplacus cusickioides
2b) Leaf surfaces glabrous to sparsely glandular-puberulent, margins minutely glandular
3a) Corolla tube throat 8-12 mm, limb 10-16 mm wide;, cauline leaves 10-15 mm; Crook, Deschutes, Jefferson, Klamath, Lake, and Wheeler cos., Oregon .........Diplacus deschutesensis
3b) Corolla tube throat 13-16 mm, limb 16-24 mm wide; cauline leaves 15-25 mm Malheur Co., and Ada Co., Idaho .........Diplacus cusickii
1b) Tip of distal leaves acute to rounded
4a) Distal leaves obovate to broadly oblanceolate, generally 4-8 mm wide; calyces 5-7 mm long; corolla tube-throat 8-10mm, proximal tube purple, lower lip glabrous; mature capsules 5-8 mm .........Diplacus cascadensis
4b) Distal leaves oblanceolate to elliptic-lanceolate, mostly 2-4 mm wide; corolla tube-throat 11-14 mm, proximal tube yellow or purple, lower lip sparsely to densely villous; mature capsules 8-12 mm .........Diplacus nanus