AMYGDALACEAE 573 
pedicels about 1 em. long: corolla white or creamy, 10-15 mm. broad : drupes oval-globose, 
22-26 mm. long, red or yellowish, with a slight bloom : stone ovoid, hardly flattened, acute, 
one of the rounded edges slightly grooved. 
In dry soil or thickets, New Jersey to Florida, Alabama and the lower Mississippi Valley. CHICK 
ASAW PLUM. 
15. Prunus hortulàna Bailey. A small tree resembling P. Americana and P. nigra 
in habit, with a thin bark and spreading branches. Leaf-blades ovate to ovate-lanceolate 
or oval, 10-15 cm. long, long-acuminate, glandular-serrate ; petioles less than 2.5 em. long, 
usually with 2 or several glands near the blade: flowers in lateral clusters preceding the 
leaves: pedicels 1-2 em. long: sepals glandular-serrate : corolla 1.5-2 cm. broad : drupes 
subglobose or oval-globose, 20-23 mm. long, bright red, with a thin skin : stone somewhat 
swollen, roughened, neither margined nor crested. 
In thickets and woods, Illinois and Tennessee to Alabama, Arkansas and Texas.—A variety with 
thick, dull, coarsely serrulate sometimes oblanceolate leaf-blades prominently nerved beneath, and 
: pet stone is P. hortulana Mineri Bailey ; it occurs in Tennessee, Illinois and Missouri. WILD GoosE 
16. Prunus nigra Ait. A small tree, rarely 10 m. tall, with a trunk sometimes 3 dm. 
thick. Leaf-blades firm, elliptic to oval, 6-12 em. long, acuminate at the apex, sharply 
and mostly doubly serrate, obtuse or rounded at the base, bright green and glabrous above, 
usually sparingly pubescent beneath ; petioles 1-2 cm. long, with two red glands near the 
blade: flowers 3-5 in lateral clusters : pedicels 1-2 cm. long: sepals glandular-serrate : corolla 
about 3 cm. broad: drupes oval or subglobose, 2.5-3 cm. long, orange-red, with a slight 
bloom and thick skin : stone oval, flattened, acutely crested on the ventral edge. 
In woods or clearings, Newfoundland to Wisconsin, Alberta and Georgia. HORSE PLUM. 
__ 17. Prunus Americana Marsh. A small, somewhat spiny tree, sometimes 10 m. tall, 
with a maximum trunk diameter of about 3dm. Leaf-blades firm, elliptic to oval, or 
oval-obovate, 4-10 cm. long, acuminate, sharply singly or doubly serrate, pubescent beneath 
especially near the nerves, acute or rounded at the slightly inequilateral base ; petioles 
0.5-2 cm. long, usually glandless : flowers 2-5 in lateral clusters appearing before the 
leaves: pedicels 1-2 em. long : sepals entire: corolla 1.5-2.5 cm. broad: drupes subglo- 
bose or barely elongated, 18-25 mm. long, with a tough skin and sometimes a slight bloom : 
stone ovoid or oval, flattened, not crested along the ventral suture. 
R In woods and thickets, New York to Montana, Florida and Colorado. WILD YELLOW PLUM. 
ED PLUM.—The variety with copiously pubescent leaves and twigs, is P. Americana landta Sudw. ; it 
occurs mainly in the Gulf States west of the Mississippi River and in the contiguous states. 
4. PADUS Borckh. 
Shrubs or trees, manifestly pervaded with prussic acid. Leaves alternate, deciduous : 
blades various, simple, usually toothed, petioled. Flowers perfect, in racemes terminating 
in leafy branches of the season, following the leaves, pedicelled. Hypanthium often cam- 
panulate. Sepals 5, short. Petals5, white, imbricated, inserted in the throat of the hypan- 
thium. Stamens 15-30, inserted with the petals: filaments slender, distinct. Ovary 
sessile, 1-celled. Style simple. Ovules 2, pendulous. Drupe with a pulpy exocarp, not 
glaucous, indehiscent : stone nearly as thick as broad, bony. Seed solitary. 
Sepals deciduous: leaf-blades mostl i irgini 
: ° y serrulate with very slender teeth. 1. P. Virginiana. 
Sepals persistent : leaf-blades mostly serrulate with relatively coarse teeth. 
png shoots, raceme-rachis and pedicels glabrous. PAT 
Sepals deltoid, aaa a broader than long: leaf-blades delicately reticulated. 2. P. eximia. 
Y pals ovate, longer than broad : leaf-blades not reticulated. 3. P. serotina. 
b pe shoots, raceme-rachis and pedicels pubescent. 
af-blades finely and rather sparingly pubescent beneath (except along the 
midrib), becoming glabrate int glaucous with age. 
peupe red : leat blades prevailingly obovate, blunt. : 4. P. Cuthbertii. | 
Le tps purple : leaf-blades ovate, oblong or elliptic, acute or acuminate. 5. P. Alabamensis. 
af-blades densely and permanently clothed with tawny or rufous tomen- à 
tum, not glaucous. 6. P. australis. 
l. Padus Virginiàna (L.) Roem. A shrub or small tree, sometimes 12 m. tall, with 
acing or drooping branches anda very bitter bark. Leaf-blades thinnish, oval or 
obovate, 5-10 em long, short-acuminate at the apex, sharply serrate, usually rounded at the 
e | uum or nearly so on both sides; petioles 1-2 cm. long, slender: racemes rather 
hic long: sepals reflexed : corolla 8-10 mm. broad : drupes globose, 8-10 mm. 
lameter, red or almost black, or rarely yellow, very astringent. [Prunus Virginiana L.] 
Tina AL ky soil oron river banks, Newfoundland to Manitoba and British Columbia, south to Georgia, 
id Colorado. Spring. CHOKE CHERRY. WILD CHERRY. 
and * Padus exímia Small. A tree becoming 26 m. tall, with loosely spreading branches 
glabrous twigs. Leaf-blades relatively thin, mainly ovate, varying to oblong, oblong- 
