Annuals. Stems 7–170 cm, not self-supporting, glabrous, eglandular-hairy, or glandular-hairy; branches twining. Leaves opposite proximally, alternate distally; blade ovate to narrowly elliptic, 10–60 × 1–20 mm, surfaces glabrous or hairy. Inflorescences axillary, racemes or flowers solitary. Pedicels 1–4 mm. Flowers cleistogamous and chasmogamous; calyx lobes unequal, glandular-hairy, adaxial lobe 3.5–14 × 1–9 mm; corolla light purple to white, often dark-veined, 8–17 mm, base gibbous, mouth 2–4 mm diam., palate sometimes purple-veined, convex, 3.5–8 mm diam., puberulent. Capsules ovoid, 4–8 mm, glandular-hairy, abaxial locule with 1 pore. Seeds dark brown to black, 0.7–1.5 mm, tuberculate, reticulate-ridged. 2n = 30.

Distribution

w United States.

Discussion

Subspecies 3 (3 in the flora).

Subspecies breweri and vexillocalyculatus intergrade where their distributions overlap in the coastal ranges of California. Subspecies intermedius is disjunct in the Sierra Nevada.

Selected References

None.

Lower Taxa

Sairocarpus vexillocalyculatus subsp. breweri, Sairocarpus vexillocalyculatus subsp. intermedius, Sairocarpus vexillocalyculatus subsp. vexillocalyculatus

Key

1	Stems proximally glabrous or eglandular-hairy; corollas 11–17 mm, adaxial lips 7–17 mm.	Sairocarpus vexillocalyculatus subsp. vexillocalyculatus
1	Stems proximally glandular-hairy and, sometimes, eglandular-hairy; corollas 8–15 mm, adaxial lips 2–5.5 mm.	> 2
2	Inflorescence branches with 1 leaf at each proximal node.	Sairocarpus vexillocalyculatus subsp. breweri
2	Inflorescence branches with 2 leaves at each proximal node.	Sairocarpus vexillocalyculatus subsp. intermedius