| | 1. Corolla white to light yellow, lower lip sometimes blue- to violet-mottled |
| |
| | 2. Upper cauline leaf blade crenate, base ± lobed; stem hairs long, spreading; lower corolla lip blue-mottled |
| S. bolanderi |
| | 3. Corolla 12–14 mm; leaf length > 2 × width; San Bernardino Mountains, San Jacinto Mountains, s Mojave Desert |
| subsp. austromontana |
| | 3' Corolla 15–19 mm; leaf length 1–2 × width; Sierra Nevada, Tehachapi Mountain Area, Inner South Coast Ranges |
| subsp. bolanderi |
| | 2' Upper cauline leaf blade entire, base obtuse to wedge-shaped; stem hairs short, ascending or pointed down; lower corolla lip violet-mottled or not |
| |
| | 4. Stem 1.5–4 dm, hairs ascending or upcurled; ovary disk green-yellow; leaf blade ovate to oblong |
| S. californica |
| | 4' Stem < 2 dm, hairs pointed or curled down; ovary disk orange-red; leaf blade obovate to ± diamond-shaped |
| S. nana |
| | 1' Corolla blue to violet-blue, lower lip generally white-patched |
| |
| | 5. Flowers generally > 4 in axillary or terminal racemes, generally bracted |
| S. lateriflora |
| | 5' Flowers 1, axillary, subtended by leaves |
| |
| | 6. Back of upper calyx lip dome-like; fruit brown; generally wet habitats |
| S. galericulata |
| | 6' Back of upper calyx lip transversely ridged, ± concave behind ridge; fruit black; generally dry habitats |
| |
| | 7. Stem and leaf hairs 1–3 mm, spreading; upper cauline leaf blades generally crenate; plants with tubers |
| S. tuberosa |
| | 7' Stem and leaf hairs << 0.5 mm, curled or appressed; upper cauline leaf blades entire; rhizomes slender, tubers ± 0 |
| |
| | 8. Flower 12–22 mm; leaf length 2–3 × width; corolla hairs not gland-tipped |
| S. antirrhinoides |
| | 8' Flower 25–35 mm; leaf length 3–7 × width; corolla hairs gland-tipped |
| S. siphocampyloides
|