Sairocarpus watsonii
Sairocarpus cornutus
Watson's snapdragon
spur snapdragon
8–85 cm, not self-supporting, basally hairy, otherwise glabrous;
branches twining.
10–60 cm, self-supporting, glandular-hairy;
branches not twining.
opposite proximally, alternate distally;
blade linear, 5–55 × 1–4 mm, surfaces glabrous.
opposite proximally, alternate distally;
blade linear to oblanceolate, 7–43 × 3–6(–10) mm, surfaces glandular-hairy.
axillary, flowers solitary.
axillary, flowers solitary.
4–25(–30) mm.
1–4 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 equal or subequal, glandular-hairy, hairs long, eglandular, adaxial lobe 3–7 × 1 mm;
corolla white to pale lavender, often violet-veined, 9–14 mm, base spurred, mouth 2–3 mm diam., palate sometimes purple-veined, rounded or angular, 3.5–6.5 mm diam., glabrous or hairy.
globular-ovoid, 2.5–6 mm, glandular-hairy, abaxial locule with 1 pore.
ovoid, 5–7 mm, glandular-hairy, abaxial locule indehiscent or with 1 pore.
black, 0.6–1 mm, tuberculate.
black to dark brown, 1 mm, tuberculate and longitudinally ridged.
= 30.
= 32.
Sairocarpus watsonii
Sairocarpus cornutus
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.)
Subspecies 2 (2 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Corolla veins violet, palates rounded, hairy, without yellow patches. | subsp. cornutus |
1. Corolla veins not contrasting, palates angular, glabrous or hairy, often with 2 yellow patches. | subsp. leptaleus |
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USDA Plants Database
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