Flora of North America species comparison

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Prunus dulcis

Prunus glandulosa

almond, almond tree, amandier, sweet almond

dwarf flowering almond, flowering almond
Habit Trees, not suckering, 50–80 dm, not thorny. Shrubs, suckering, 5–20 dm, not thorny.
Twigs

with terminal end buds, glabrous.

with terminal end buds, glabrous.
Leaves

deciduous;

petiole (8–)10–25 mm, usually winged distally, glabrous, usually glandular distally or on margins at bases of blades;

blade oblong to lanceolate, 2.5–10 × 1–3 cm, base obtuse, margins crenulate-serrulate to crenate-serrate, teeth blunt, glandular, apex acuminate, surfaces glabrous.

deciduous;

petiole 1–6 mm, hairy on adaxial surface, eglandular;

blade narrowly elliptic to oblong-lanceolate, 2.5–9 × 0.9–2.5 cm, base cuneate to obtuse, margins crenulate-serrulate, teeth blunt, glandular, apex acute to acuminate, abaxial surface glabrous or slightly hairy along midribs and veins, adaxial glabrous.
Inflorescences

solitary flowers or 2-flowered fascicles.

solitary flowers or 2-flowered fascicles.
Pedicels

1–5 mm, glabrous.

6–15 mm, glabrous or sparsely puberulent.
Flowers

blooming before leaf emergence;

hypanthium cupulate, 4–7 mm, glabrous externally;

sepals erect-spreading to spreading, oblong-ovate, 4–8 mm, margins entire, tomentose, surfaces glabrous;

petals pink to nearly white, obovate, elliptic, or suborbiculate, 12–25 mm;

ovaries hairy.

blooming at leaf emergence;

hypanthium campanulate, 2–3 mm, glabrous or sparsely puberulent externally;

sepals spreading to reflexed, ovate, 2.5–5 mm, margins glandular-toothed, ± ciliate, surfaces glabrous or sparsely puberulent;

petals 25+, white or pink, elliptic to narrowly elliptic, 8–11 mm;

ovaries glabrous.
Drupes

gray-green, ovoid-oblong, compressed, 25–40 mm, velutinous;

mesocarps leathery (splitting);

stones ellipsoid, strongly flattened, pitted.

reddish, subglobose, 10–15 mm, glabrous;

mesocarps fleshy;

stones subglobose, not flattened.
2n

= 16.

Prunus dulcis

Prunus glandulosa
Phenology Flowering Feb–Mar; fruiting Jul–Sep. Flowering Mar–May.
Habitat Roadsides, canyons, grasslands Roadsides, fencerows, abandoned plantings
Elevation 20–500 m (100–1600 ft) 0–400 m (0–1300 ft)
Distribution
from FNA
CA; ID; WA; w Asia; n Africa [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
from FNA
IA; MI; NC; ON; e Asia (China, Japan) [Introduced in North America]
[BONAP county map]
Discussion

The United States now dominates world almond production with over 40% of the annual crop, all of it grown in or near the Central Valley of California. The in-shell “nuts” sold in stores are the pits of drupes with the leathery mesocarp removed. Almond is among the earliest blossoming trees and one of the first signs of spring in areas where it is grown.

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

Double-flowered cultivars of Prunus glandulosa, which lack stamens and carpels, are commonly planted as foundation shrubs and in borders. Although the plants are attractive in bloom, some horticulturalists consider them of little ornamental value otherwise.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 9, p. 372. FNA vol. 9, p. 377.
Parent taxa Rosaceae > subfam. Amygdaloideae > tribe Amygdaleae > Prunus Rosaceae > subfam. Amygdaloideae > tribe Amygdaleae > Prunus
Sibling taxa
P. americana, P. andersonii, P. angustifolia, P. armeniaca, P. avium, P. caroliniana, P. cerasifera, P. cerasus, P. domestica, P. emarginata, P. eremophila, P. fasciculata, P. fremontii, P. geniculata, P. glandulosa, P. gracilis, P. havardii, P. hortulana, P. ilicifolia, P. laurocerasus, P. lusitanica, P. mahaleb, P. maritima, P. mexicana, P. minutiflora, P. murrayana, P. myrtifolia, P. nigra, P. padus, P. pensylvanica, P. persica, P. pumila, P. rivularis, P. serotina, P. speciosa, P. spinosa, P. subcordata, P. subhirtella, P. texana, P. tomentosa, P. umbellata, P. virginiana, P. yedoensis
P. americana, P. andersonii, P. angustifolia, P. armeniaca, P. avium, P. caroliniana, P. cerasifera, P. cerasus, P. domestica, P. dulcis, P. emarginata, P. eremophila, P. fasciculata, P. fremontii, P. geniculata, P. gracilis, P. havardii, P. hortulana, P. ilicifolia, P. laurocerasus, P. lusitanica, P. mahaleb, P. maritima, P. mexicana, P. minutiflora, P. murrayana, P. myrtifolia, P. nigra, P. padus, P. pensylvanica, P. persica, P. pumila, P. rivularis, P. serotina, P. speciosa, P. spinosa, P. subcordata, P. subhirtella, P. texana, P. tomentosa, P. umbellata, P. virginiana, P. yedoensis
Synonyms Amygdalus dulcis, A. communis, P. amygdalus
Name authority (Miller) D. A. Webb: Feddes Repert. 74: 24. (1967) Thunberg: in J. A. Murray, Syst. Veg. ed. 14, 463. (1784)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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