| | 1. Bracts grading into upper leaves, uniformly ± green (or uppermost purple-tinged), all 3 lobes triangular-lanceolate; inflorescence densely glandular-puberulent |
| |
| | 2. Corolla white to purplish, generally 15–20 mm; beak tip strongly hooked; lower corolla lip strongly pouched, teeth 0 |
| O. bracteosus |
| | 2' Corolla golden-yellow, 10–15 mm; beak tip obscurely hooked; lower corolla lip moderately pouched, teeth 3, incurved |
| O. luteus |
| | 1' Bracts differing abruptly from upper leaves, tips purplish or white; lateral 2–4 lobes much narrower than ovate or oblong central lobe; inflorescence glabrous or sparsely glandular-puberulent |
| |
| | 3. Beak with conspicuous, cylindric, hooked tip — Klamath Ranges, Cascade Range |
| |
| O. imbricatus |
| | 4' Corolla 25–30 mm — presumed extinct |
| O. pachystachyus |
| | 3' Beak straight, without cylindric, hooked tip |
| O. cuspidatus |
| | 5. Corolla 16–25 mm; beak 7–8 mm, generally 1–4 mm > lower lip; lower lip pouches 4–5 mm deep — Northwestern California, Cascade Range |
| subsp. cuspidatus |
| | 5' Corolla 9–18 mm; beak 3–6 mm, < 1 mm > lower lip; pouches 1–3 mm deep |
| |
| | 6. Corolla 14–18 mm, well exserted, beak 5–6 mm, pouches ± 3 mm deep; Northwestern California, Cascade Range |
| subsp. copelandii |
| | 6' Corolla 9–14 mm, ± hidden by bract, beak 3–4 mm, pouches 1–2 mm deep; Sierra Nevada, Great Basin Floristic Province |
| subsp. cryptanthus
|