Flora of North America species comparison

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Sairocarpus watsonii

Watson's snapdragon
Habit Annuals.
Stems

8–85 cm, not self-supporting, basally hairy, otherwise glabrous;

branches twining.
Leaves

opposite proximally, alternate distally;

blade linear, 5–55 × 1–4 mm, surfaces glabrous.
Inflorescences

axillary, flowers solitary.
Pedicels

4–25(–30) mm.
Flowers

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.
Capsules

globular-ovoid, 2.5–6 mm, glandular-hairy, abaxial locule with 1 pore.
Seeds

black, 0.6–1 mm, tuberculate.
2n

= 30.

Sairocarpus watsonii
Phenology Flowering Mar–Apr.
Habitat Gravelly slopes.
Elevation (0–)200–1000 m. ((0–)700–3300 ft.)
Distribution
from FNA
AZ; Mexico (Baja California, Baja California Sur, Sonora)
[BONAP county map]
Discussion

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.)
Source FNA vol. 17, p. 48.
Parent taxa Plantaginaceae > Sairocarpus
Sibling taxa
S. cornutus, S. coulterianus, S. kingii, S. multiflorus, S. nuttallianus, S. subcordatus, S. vexillocalyculatus, S. virga
Synonyms Antirrhinum watsonii, A. kingii var. watsonii
Name authority (Vasey & Rose) D. A. Sutton: Revis. Antirrhineae, 471. (1988)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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