Prunus havardii

(W. Wight) S. C. Mason

J. Agric. Res. 1: 153, 176. 1913.

Common names: Havard’s almond
Basionym: Amygdalus havardii W. Wight in W. R. Dudley et al., Dudley Mem. Vol., 133. 1913 (as harvardii)
Treatment appears in FNA Volume 9. Treatment on page 371. Mentioned on page 356, 359.

Shrubs, suckering unknown, much branched, 10–20 dm, thorny. Twigs with axillary end buds, puberulent. Leaves deciduous; petiole 1–3 mm, glabrous or puberulent, eglandular; blade rhombic, obovate, or fan-shaped, 0.5–1.6 (–2) × 0.2–0.8 (–1.4) cm, base broadly obtuse or rounded to nearly truncate, margins serrate or dentate in distal 1/2, teeth blunt to sharp, some callus-tipped, rarely glandular, apex rounded to obtuse, surfaces puberulent. Inflorescences solitary flowers. Pedicels 0 mm. Flowers unisexual, plants dioecious, blooming at leaf emergence; hypanthium campanulate, 2.5–3 mm, glabrous externally; sepals spreading to reflexed, triangular, 0.7–1 mm, margins entire, sparsely ciliate, surfaces glabrate; petals white, obovate, 2 mm; ovaries hairy. Drupes reddish-brown, ovoid, 8–11 mm, puberulent; hypanthium tardily deciduous; mesocarps leathery to dry (splitting); stones ovoid, slightly flattened.


Phenology: Flowering Apr–Jun; fruiting Jun–Aug.
Habitat: Draws, dry rocky slopes of canyons, limestone soil, igneous rock
Elevation: 700–1700 m

Discussion

Prunus havardii is endemic to the Chihuahuan Desert of trans-Pecos Texas and across the Rio Grande in Mexico, with most collections from the Big Bend area.

Selected References

None.

Lower Taxa

None.
... more about "Prunus havardii"
Joseph R. Rohrer +
(W. Wight) S. C. Mason +
dark gray +, gray-brown +, reddish-brown +  and reddish +
compound +  and simple +
opposite +  and alternate +
rounded +  and obtuse +
Amygdalus havardii +
1.6 cm16 mm <br />0.016 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.4 cm14 mm <br />0.014 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
fan--shaped +, obovate +  and rhombic +
0.5 cm5 mm <br />0.005 m <br /> (18 cm180 mm <br />0.18 m <br />) +
? (?) +  and ? (?) +
0.2cm +  and 0.8cm +
free +  and distinct +
Havard’s almond +
solitary +, fascicles +, 2-flowered +  and umbellate +
Tex. +  and Mexico (Chihuahua) +
not +  and aggregated +
3 cm30 mm <br />0.03 m <br /> (8 cm80 mm <br />0.08 m <br />) +
reddish-brown +
0.8 cm8 mm <br />0.008 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
700–1700 m +
flattened +
hairy +  and glabrous +
0.4 cm4 mm <br />0.004 m <br /> (4 cm40 mm <br />0.04 m <br />) +
at leaf emergence +  and blooming +
not +  and aggregated +
not +  and aggregated +
not +  and aggregated +
Draws, dry rocky slopes of canyons, limestone soil, igneous rock +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
1-64(-90)[-100]-flowered +
crassinucellate +
deciduous +
entire +, dentate +  and serrate +
undulate +, toothed +, entire +, flat +  and lobed +
leathery +  and dry +
inferior +  and superior +
biseriate +  and clustered +
collateral +  and apical +
0 cm0 mm <br />0 m <br /> (?) +
0 (?) +  and 4 (?) +
free +  and distinct +
2 cm20 mm <br />0.02 m <br /> (?) +
puberulent +  and glabrous +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering Apr–Jun +  and fruiting Jun–Aug. +
adnate +, free +, connate +  and distinct +
J. Agric. Res. +
not arillate +
free +  and distinct +
spreading +  and reflexed +
triangular +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
free +  and distinct +
branched +  and simple +
1 +  and 20 +
flattened +  and ovoid +
deciduous +
distinct +
basal +, lateral +, subterminal +  and terminal +
not elongate +
glabrate +  and puberulent +
Amygdalus +, Armeniaca +, Cerasus +, Lauro-cerasus +, Padus +  and Persica +
Prunus havardii +
species +
callus-tipped +
blunt +  and sharp +
inconspicuous +
puberulent +
thorny +  and branched +
plant +, shrub +  and suckering +
hairy +  and glabrous +