51. Vauquelinia Corrêa ex Bonpland in A. von Humboldt and A. J. Bonpland, Pl. Aequinoct. 1: 140, plate 40. 1807.
[For Nicolas Louis Vauquelin, 1763–1829, French chemist and pharmacist]
William J. Hess
Shrubs or trees, (10–)15–80(–100) dm. Stems 1–10+, orientation unknown; bark gray to dark gray, ˂smooth, older plaited˃; short shoots absent; unarmed; tomentulose to villous-canescent, ˂hairs white, short, tightly crinkled˃, often tardily to soon glabrescent. Leaves persistent, cauline, ˂erect-ascending to spreading˃, simple; stipules tardily deciduous, free, subulate to narrowly deltate, margins entire, glandular; petiole present; blade oblong-elliptic or oblong-lanceolate to linear-lanceolate or linear to linear-oblong, (2.2–)3–13(–18.5) cm, leathery, margins flat, ˂usually horny˃, serrate, serrulate, or crenulate, sometimes doubly serrate, rarely entire, venation pinnate and semicraspedodromous, surfaces tomentulose, sometimes glabrate or puberulent. Inflorescences terminal or axillary, 15–25+-flowered, compound corymbs, puberulent to tomentulose; bracts present; bracteoles present. Pedicels present. Flowers: perianth and androecium perigynous, 5–10 mm diam.; hypanthium hemispheric, 1.5–2.5(–3) mm, ˂leathery˃, sericeous, glabrescent, ˂interior proximal surface nectariferous˃; sepals 5, erect, broadly ovate; petals 5, white, oblong-ovate to oblong-obovate, ˂base clawed, apex rounded to emarginate˃; stamens 18–20, shorter than petals; ˂torus thickened˃; carpels 5, connate, free, strigose, styles terminal, distinct; ovules 2. Fruits capsules, broadly ovoid, 4.5–7.5 mm, ˂woody˃, sericeous, ventrally (fully) and dorsally (in distal 1/2) dehiscent, splitting into 5 follicles; hypanthium persistent; sepals persistent, erect; styles persistent. Seeds 2 per follicle, ˂winged˃. x = 15.
Species 3 (2 in the flora): sw United States, Mexico.
Vauquelinia species are xerophytic. The third species in the genus, V. australis Standley, is known from Oaxaca and Puebla, Mexico.
SELECTED REFERENCE Hess, W. J. and J. Henrickson. 1987. A taxonomic revision of Vauquelinia (Rosaceae). Sida 12: 101–163.