Prunus serotina var. rufula

(Wooton & Standley) McVaugh

Brittonia 7: 307. 1951.

Common names: Southwestern black cherry
Basionym: Padus rufula Wooton & Standley Contr. U.S. Natl. Herb. 16: 132. 1913
Synonyms: Prunus serotina subsp. virens (Wooton & Standley) McVaugh P. serotina var. virens (Wooton & Standley) McVaugh P. virens
Treatment appears in FNA Volume 9. Treatment on page 364. Mentioned on page 363, 365.

Twigs glabrous or hairy, hairs rusty brown or gray. Leaves: petiole (2–) 4–10 (–15) mm, glabrous or sparsely to densely hairy, sometimes glandular at petiole-blade junction; blade usually elliptic or oblong, rarely ovate or obovate, 2–5.2 (–7.4 on long-shoots) × 1.1–2.6 (–3.8) cm, leathery, apex usually acute, rarely abruptly acute, abaxial surface usually densely hairy along midribs proximally, sometimes glabrous. Inflorescences: rachises (25–) 35–70 (–102) mm.


Phenology: Flowering Mar–May; fruiting Jul–Aug.
Habitat: Along streams, moist slopes in canyons, mixed oak-pine-juniper woodlands
Elevation: 1400–2500 m

Distribution

V9 592-distribution-map.jpg

Ariz., N.Mex., Tex., Mexico (Baja California), Mexico (Chihuahua), Mexico (Coahuila), Mexico (Durango), Mexico (Guanajuato), Mexico (Guerrero), Mexico (Jalisco), Mexico (San Luis Potosí), Mexico (Sonora)

Discussion

Black cherries of the semiarid southwestern mountains and canyons (var. rufula) have generally smaller, thicker leaf blades on shorter petioles than those of the eastern United States and southeastern Canada. The southwestern plants vary in the degree of indument (hairs often rusty, sometimes lighter on the branchlets and axes of the racemes, and on petioles and along midribs abaxially). The glabrous plants have been segregated by some botanists as var. virens; the variation in indument is nearly continuous, and the plants are otherwise similar to hairy specimens.

Selected References

None.

Lower Taxa

None.
glabrous +  and hairy +
acute;acute +
Joseph R. Rohrer +
(Wooton & Standley) McVaugh +
dark gray +, gray-brown +, reddish-brown +  and reddish +
compound +  and simple +
opposite +  and alternate +
cuneate +  and rounded +
Padus rufula +
2.6 cm26 mm <br />0.026 m <br /> (3.8 cm38 mm <br />0.038 m <br />) +
2 cm20 mm <br />0.02 m <br /> (5.2 cm52 mm <br />0.052 m <br />) +
obovate +, ovate +, oblong +  and elliptic +
0.5 cm5 mm <br />0.005 m <br /> (18 cm180 mm <br />0.18 m <br />) +
1.1 cm11 mm <br />0.011 m <br /> (?) +  and 2.6 cm26 mm <br />0.026 m <br /> (?) +
free +  and distinct +
2.5 cm25 mm <br />0.025 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
3.5 cm35 mm <br />0.035 m <br /> (16 cm160 mm <br />0.16 m <br />) +
Southwestern black cherry +
solitary +, fascicles +, 2-flowered +  and umbellate +
Ariz. +, N.Mex. +, Tex. +, Mexico (Baja California) +, Mexico (Chihuahua) +, Mexico (Coahuila) +, Mexico (Durango) +, Mexico (Guanajuato) +, Mexico (Guerrero) +, Mexico (Jalisco) +, Mexico (San Luis Potosí) +  and Mexico (Sonora) +
not +  and aggregated +
1 cm10 mm <br />0.01 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
dark purple +  and nearly black +
globose +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1400–2500 m +
flattened +
hairy +  and glabrous +
0.4 cm4 mm <br />0.004 m <br /> (4 cm40 mm <br />0.04 m <br />) +
unisexual +  and bisexual +
not +  and aggregated +
not +  and aggregated +
not +  and aggregated +
Along streams, moist slopes in canyons, mixed oak-pine-juniper woodlands +
gray +  and rusty brown +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
18-55(-90)-flowered +
crassinucellate +
deciduous +
entire +, crenulate-serrulate +  and serrate +
glandular-toothed +
inferior +  and superior +
biseriate +  and clustered +
collateral +  and apical +
hairy +  and glabrous +
0.1 cm1 mm <br />0.001 m <br /> (1 cm10 mm <br />0.01 m <br />) +
0 (?) +  and 4 (?) +
free +  and distinct +
obovate;suborbiculate +
0.2 cm2 mm <br />0.002 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
glabrous or +  and sparsely densely hairy +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Flowering Mar–May +  and fruiting Jul–Aug. +
adnate +, free +, connate +  and distinct +
7 cm70 mm <br />0.07 m <br /> (10.2 cm102 mm <br />0.102 m <br />) +
35mm +  and 70mm +
not arillate +
free +  and distinct +
erect-spreading +  and reflexed +
obovate +, lanceolate +, ovate-elliptic +, oblong +, ovate +, semicircular +  and triangular +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
free +  and distinct +
branched +  and simple +
1 +  and 20 +
linear;lanceolate +
not flattened +  and subglobose +
deciduous +
distinct +
basal +, lateral +, subterminal +  and terminal +
not elongate +
Prunus serotina subsp. virens +, P. serotina var. virens +  and P. virens +
Prunus serotina var. rufula +
Prunus serotina +
variety +
callus-tipped +  and glandular +
appressed +  and incurved +
blunt +  and sharp +
inconspicuous +
hairy +  and glabrous +
tree +, not suckering +  and shrub +
hairy +  and glabrous +