Vauquelinia corymbosa subsp. angustifolia

(Rydberg) W. J. Hess & Henrickson

Sida 12: 148. 1987.

Basionym: Vauquelinia angustifolia Rydberg in N. L. Britton et al., N. Amer. Fl. 22: 260. 1908
Treatment appears in FNA Volume 9. Treatment on page 431.

Shrubs [trees], 15–70(–100) dm, multistemmed [single-stemmed]. Leaves: petiole (6–)9–28(–40) mm; blade green or yellow-green, linear to linear-oblong, (3.5–)6–13(–18.5) × (0.3–)0.5–0.9(–1.3) cm, base obliquely cuneate to truncate-subcordate, margins usually serrate, sometimes partly doubly serrate, rarely entire, teeth (3–)5–10(–14) per 5 cm, 0.2–1.5(–2.5) mm, apex acute to rounded, mucronate, lustrous, surfaces tomentulose, tardily glabrescent. Corymbs 2.5–5.5 × (3–)3.5–6(–7) cm, mostly glabrate [tomentulose or canescent]. Flowers: hypanthium 1.7–2.5 × 2.5–3.8 mm, floccose or sparsely villous to glabrate; sepals (1.2–)1.5–2.4 × 1.5–2.3 mm, margins glandular; petals oblong-ovate to oblong-obovate, 2.4–4.5(–5.6) × 2–3.5 mm; filaments 2.7–5 mm. Capsules 5–7.5 × 3.5–5.4 mm. Seeds 4.4–4.8 × 1–1.3 mm. 2n = 30 (Mexico).


Phenology: Flowering spring.
Habitat: Limestone, rarely igneous rock slopes and canyons, and gypsum flats, Chihuahuan Desert scrub and chaparral
Elevation: 1000–1500 m

Distribution

V9 728-distribution-map.jpg

Tex., Mexico (Chihuahua, Coahuila).

Discussion

Subspecies angustifolia is found in the flora area only in the mountains of Brewster and Presidio counties. Its leaves are typically 20 times longer than wide, with marginal serrations approximately one per centimeter or rarely entire; its inflorescences are mostly glabrate.

Selected References

None.

Lower Taxa

None.
William J. Hess +
(Rydberg) W. J. Hess & Henrickson +
Vauquelinia angustifolia +
Tex. +, Mexico (Chihuahua +  and Coahuila). +
1000–1500 m +
Limestone, rarely igneous rock slopes and canyons, and gypsum flats, Chihuahuan Desert scrub and chaparral +
Flowering spring. +
Vauquelinia corymbosa subsp. angustifolia +
Vauquelinia corymbosa +
subspecies +