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Arizona rosewood

Habit Shrubs or trees, sometimes subshrubs or herbs.
Young stems

initially tomentulose, becoming canescent or tardily glabrate.

Leaves

petiole (4–)7–15(–26) mm;

blade bicolor, abaxially white, adaxially green and lustrous, lanceolate to oblong-lanceolate or narrowly elliptic, (3.5–)4–9(–15) × (0.7–)1–2(–3.2) cm, surfaces initially villous-tomentulose, abaxially usually sparsely white-puberulent, hairs slightly coiled, sometimes glabrate or glabrous, adaxially mostly glabrate or glabrous.

alternate, sometimes opposite, simple, sometimes pinnately compound;

stipules present or absent.

Flowers

hypanthium 2–2.5(–3) × 2–3.7(–4.5) mm, exterior tomentulose or tardily glabrate, interior glabrous;

sepals 1.4–2.1 × 1.5–2.3 mm, puberulent-villous;

petals 4–5 × 2.5–3.5 mm;

filaments 3–5.5 mm.

torus absent or minute;

carpels 1–5(–8), distinct or +/- connate (Maleae), free or +/- adnate to hypanthium (many Maleae), styles distinct or +/- connate (some Maleae);

ovules (1 or)2(–5+), collateral, clustered, or biseriate.

Fruits

follicles aggregated or not, capsules, drupes aggregated or not, aggregated drupelets, pomes, or aggregated nutlets, rarely achenes or aggregated achenes;

styles persistent or deciduous, not elongate (elongate in Gillenieae).

Capsules

5–6.5 × 3.5–4.5 mm.

Seeds

4–5 × 1.2–1.3 mm.

Corymbs

3–5(–12) × 3–8(–13) cm.

x

= 8, 9, 15, 17.

2n

= 30.

Vauquelinia californica subsp. californica

Rosaceae subfam. amygdaloideae

Phenology Flowering spring.
Habitat Limestone and granite substrates, shrublands of upper Sonoran Desert from above desert plains to lower pinyon-juniper zones
Elevation 700–1800 m (2300–5900 ft)
Distribution
from FNA
AZ; Mexico (Baja California, Baja California Sur)
[BONAP county map]
from FNA
HI; North America; Mexico; Central America; South America; Europe; Asia; Africa; Atlantic Islands (Madeira); Australia
Discussion

Subspecies californica shows considerable variation among populations, particularly with regard to vestiture, leaf size and shape, petiole length, and number of marginal teeth. Often populations within the same mountain ranges in Arizona share the same pattern of variation. Most of the populations have distinctly bicolor leaves, at least when young, or abaxially become weakly puberulent and persistently, closely tomentulose to canescent with tightly coiled hairs.

The name Vauquelinia torreyi S. Watson, which is illegitimate, pertains here.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Cyanogenic glycosides are usually present in Amygdaloideae; sorbitol is present.

The name Amygdaloideae Arnott (1832) has priority over Spiraeoideae Arnott (1832), used by D. Potter et al. (2007), because Amygdalaceae (1820) is an earlier conserved name.

Tribes 9, genera 55, species ca. 1300 (9 tribes, 38 genera, 361 species, including 20 hybrids, in the flora)

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 9, p. 430. FNA vol. 9, p. 345. Author: Luc Brouillet.
Parent taxa Rosaceae > subfam. Amygdaloideae > tribe Maleae > Vauquelinia > Vauquelinia californica Rosaceae
Sibling taxa
V. californica subsp. pauciflora, V. californica subsp. sonorensis
Subordinate taxa
Name authority unknown Arnott: Botany, 107. (1832)
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