Sairocarpus watsonii
Sairocarpus subcordatus
Watson's snapdragon
dimorphic snapdragon
8–85 cm, not self-supporting, basally hairy, otherwise glabrous;
branches twining.
8–90 cm, not self-supporting, hairy;
branches twining.
opposite proximally, alternate distally;
blade linear, 5–55 × 1–4 mm, surfaces glabrous.
opposite proximally, alternate distally;
blade ovate, 10–60 × 5–45 mm, surfaces glabrous, glandular-hairy, or eglandular-hairy.
axillary, flowers solitary.
axillary, racemes or flowers solitary.
4–25(–30) mm.
1–3 mm.
cleistogamous and chasmogamous;
calyx lobes equal, glandular-hairy, adaxial lobe 2.5–4 × 1–1.5 mm;
corolla light purple, purple-veined, 5.5–7 mm, base barely gibbous, mouth 2–2.5 mm diam., palate purple-veined, angular, 2.5–4 mm diam., minutely papillate.
chasmogamous;
calyx lobes unequal, hairy or glandular-hairy, adaxial lobe 8–14 × 5–10 mm;
corolla white to tan, 13–17 mm, base gibbous, mouth 2.5–3.5 mm diam., palate not veined, slightly 2-lobed, 5–9 mm diam., tomentose.
globular-ovoid, 2.5–6 mm, glandular-hairy, abaxial locule with 1 pore.
narrowly ovoid, 5–6 mm, glandular-hairy, abaxial locule with 1 pore.
black, 0.6–1 mm, tuberculate.
dark brown to black, 1 mm, tuberculate, reticulate-ridged.
= 30.
= 30.
Sairocarpus watsonii
Sairocarpus subcordatus
The only North American collections of Sairocarpus watsonii are from Organ Pipe National Monument in Pima County. Sairocarpus watsonii is similar to S. kingii, which grows farther north and has unequal sepals.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Sairocarpus subcordatus is similar to S. vexillocalyculatus; it has relatively broader leaves and white to tan corollas with abaxial lobes reflexed. The species is known from the northern and central Inner North Coast Ranges.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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