(A. Gray) Sargent, Gard. & Forest. 4: 317. 1891.
A. Gray in A. Gray et al., Syn. Fl. N. Amer. ed. 2, 2(1): 396. 1886
3-8[-10] m; bark light gray to reddish gray, checkered with squarish to rectangular segments or plates, 1-4 × 1-2.5 cm, retained on bole and major limbs; twigs 3+ years old with brick-red outer bark exfoliating in flakes or, sometimes, in slender strips.
larger on sterile shoots with longer internodes; petiole (often red), (1-)1.7-3.2(-4.2) cm, base slightly decurrent, glabrous; blade slightly lighter green abaxially, olive-green and glossy adaxially, ovate, (2.5-) 3-7.5(-9) × (1-)1.8-3(-4) cm, base usually tapered-acute, rarely slightly rounded [broader and more nearly ovate-lanceolate], apex usually acute, sometimes slightly acuminate, surfaces glabrous.
often congested; axes densely hairy, hairs sometimes glandular.
accrescent, obliquely erect or slightly pendulous, 2.4-5 mm (to 16 mm in fruit), densely hairy, hairs sometimes glandular; bract clasping base, reddish, scalelike, 1.4-2 mm.
calyx pale green, lobes 1.1-1.5 mm (mostly hidden beneath corolla), apex obtuse or rounded; corolla 5-5.6 mm; anthers 1.3-1.5 mm, spurs 1/2-2/3 times length of thecae, (finely tuberculate); ovary with (2-)3-5+ ovules per locule.
blackish red, 6.5-9 mm diam.
ca. 2 mm.
Flowering May-Jun(-Aug); fruiting Aug-Oct. Riverine forests and oak parklands along seasonally moist waterways; 1500-2400 m; Ariz., N.Mex.; Mexico (Chihuahua, Durango, Jalisco, Sinaloa, Sonora, Zacatecas).
Two outstanding features of
distinguish it in the field: 1) the consistently narrow, glossy leaves with tapered leaf bases, and 2) the nonexfoliating bark that acquires a checkered appearance within a few years. Trees with the narrowest leaves overall and the most narrowly tapered bases occur in the populations in the extreme northern part of the range in Cochise, Graham, Pima, and Santa Cruz counties of southeastern Arizona and Hidalgo County in southwestern New Mexico.