AMYGDALACEAE 571 
Twigs closely pubescent. 
Corolla 6-8 mm. broad : drupe 8-10 mm. long. 10. P. normalis. 
Corolla 14-20 mm. broad: drupe 12-15 mm. long. 11. P. injucunda. 
B. Drupe red or orange, without bloom, mostly over 20 mm. thick. 
Sepals glandular-ciliate or glandular-serrate or merely ciliate. 
Sepals ciliate or glandular-ciliate, otherwise glabrous: leaf-blades 
minutely toothed. 
Leaf-blades with acuminate tips, serrate : drupe 15-20mm.long. 12. P. rivularis. 
Leaf-blades obtuse or merely acute, serrulate: drupe 20-26 mm. 
long. 
Sepals ciliate with simple hairs: drupe thick-skinned. 18. P. Watsonii. 
Sepals ciliate with glandular hairs: drupe thin-skinned. 14. P. angustifolia. 
Sepals glandular-serrate, pubescent, at least within: leaf-blades 
rather coarsely toothed. 
Sepals pubescent on both sides. 15. P. hortulana. 
Sepals pubescent within. 16. P. nigra. 
Sepals entire, not glandular-ciliate. 17. P. Americana. 
1. Prunus minutiflóra Engelm. A low rigid intricately-branched shrub 3-7 dm. 
tall. Leaf-blades leathery, obovate or cuneate, 1-2 cm. long, clustered on shortened 
branches, rounded or obtuse at the apex, entire or coarsely toothed with glandless teeth, 
minutely pubescent beneath or glabrous, cuneately narrowed into short petioles: flowers 
usually solitary, very short-pedicelled : sepals not glandular-toothed : drupes ovoid or 
globose-ovoid, 8-12 mm. long, velvety. 
On prairies, Texas. 
2. Prunus glandulósa Hook. A low diffuse, somewhat thorny shrub, with zigzag 
branches. Leaf-blades oblong or oblong-elliptic, 2-2.5 em. long, obtuse at the apex, ser- 
rate with gland-tipped spreading teeth, rather acute at the base, pubescent on both sides, 
short-petioled : clusters usually 2-flowered, or the flowers sometimes solitary : pedicels 
mostly less than 1 cm. long, finely pubescent: sepals oblong, about as long as the hy- 
panthium, conspicuously glandular-toothed : petals obovate, much longer than the sepals : 
drupes subglobose, velvety. 
On prairies, Texas. 
3. Prunus Pennsylvánica L. f. A small tree, with a smooth aromatic bark and 
glabrous foliage. Leaf-blades thinnish, oblong-elliptic to nearly oval or lanceolate, 8-15 
cm. long, acuminate at the apex, doubly serrate, acute or rounded at the base ; petioles 
slender, 1-1.5 em. long: flowers in lateral sometimes peduncled clusters: pedicels 
slender, 1-2.5 cm. long or 3 em. long at maturity: corolla 10-12 mm. broad: drupes 
globose, 4-7 mm. in diameter, red, without bloom, with thin sour flesh : stone subglobose, 
or slightly elongated. 
xb "d CET SEP mo. Sorondo] to the Rocky Mountain region, south to Georgia. WILD 
4. Prunus cuneàta Raf. A low spreading shrub 3-12 dm. tall, with glabrous foliage. 
Leaf-blades firm, oblong, oval or somewhat obovate, 3-8 cm. long, sometimes acute at both 
ends, cuneate at the base, bright green above, glaucous beneath, rather coarsely serrate 
With appressed teeth ; petioles 8-20 mm. long: flowers in clusters appearing with the 
leaves : pedicels 1-1.5 em. long: corolla about 1 cm. broad, white or nearly so: drupes 
subglobose, 8-10 mm. in diameter. 
Carolina ie, Sometimes rocky soil or meadows, New Hampshire to Wisconsin, Minnesota and North 
5. Prunus Cérasus L. A relatively small tree. Leaf-blades ovate, oval-ovate or 
ovate-lanceolate, 4-11 em. long, abruptly acute or:acuminate, serrate-dentate, glabrous, 
resinous when young: flowers in lateral clusters from scaly buds: pedicels about 8 cm. 
ong during anthesis: corolla 1.5-2.5 cm. broad : drupes nearly globose, 8-10 mm. in di- 
ameter, or larger in cultivation, sour, red or black, without bloom : stone subglobose. 
In woods and thickets, N ltivation. Native 
of Europe. Soun hating ew York to Pennsylvania and Georgia, escaped from cu 
6. Prunus Avium L. A tree becoming 23 m. high. Leaf-blades ovate to oval or 
pe orate, 5-10 cm. long, abruptly short-acuminate, serrate, pubescent beneath, sometimes 
É y on the nerves : flowers in lateral clusters from scaly buds : pedicels slender, 25-36 mm. 
ong during anthesis: corolla 2.5-3 cm. broad: drupes subglobose, 8-10 mm. in di- 
ameter, sweet, without bloom : stone globular. 
-.,, In open woods and thick i i rom cultivation. 
Native goal or et S ce cens to Pennsylvania and Georgia. Escaped from e 
en Pe Prunus umbellata Ell. A low shrub or small tree, sometimes 6 m. tall, with a 
MD er, erect or ascending trunk. Leaf-blades thinnish, oblong, elliptic or nearly oval, 
Virg broadest above or below the middle, short-acuminate, or merely acute, serrate, 
den ed or acute at the base, glabrous on both sides or sparingly pubescent beneath, on 
ort slender petioles: flowers expanding before the leaves, in lateral clusters: pedicels 
