ORDER XLIV. ROSACEA. 299 



1. P. America'na. (Marsh.) Stem smooth, with long, flexible branch- 

 es ; the old branch* - b< im what rough and thorny. Leaves ovate or 

 oblong-ovate, acuminate, sharply serrate, reined beneath ; petioles with 

 two glands, nearly glabrous when old. Flowers in umbels, 2 — 5. Seg- 

 ments of the calyx lanceolate. Fruit a roundish drupe, reddish when 

 ripe, large, with a tough skin. — White. T j . March and April. Along 

 the banks of streams. 15 — 20 feet. Yellow Plum. Red Plum. 



2. P. Chka'sa. Branches thorny. Leaves oblong-lanceolate or ob- 

 "Tanceolate, acute, serrulate. Umbels 2 — 3-flowered ; calyx usually gla 



brous, sometimes pubescent. Drupe globose, red. Chickasaw Plum 



3. P. mahiti'ma, (Wang.) A low shrub. Leaves oval or ovate, acu 

 ruinate, finely serrate. Umbels few-flowered. Fruit nearly globular 

 covered with bloom, red or purple ; pleasant to the taste. — White. ^ . 

 March and April. On the sea-coast. 



Genus III.— AMYG'DALUS. Tourn. 11—1. 

 (From the Greek amusso, to lacerate, in allusion to the appearance of the stem.) 



Calyx 5-cleft, inferior. Petals 5. Fruit a drupe. Peach. 



1. A. Pek'sica, (L.) Leaves lanceolate, serrate; serratures acute. Flow- 

 ers sessile, solitary. — Red. T ^ . Feb. — March. The Flowering Almond 

 is the A. nana. 



Genus IV.— CER'ASUS. Juss. 11—1. 

 (From Cerasus, a town in Pontus, Asia.) 



Calyx inferior, campanulate, 5-cleft. Petals 5-spreading. 

 Stamens numerous. Drupe globose ; nucleus smooth. Leaves 

 condurjlicate in vernation. Cherry. 



1. C. Virginia'na, (D. C.) A tree with smooth branches, or small 

 shrubs with grayish bark. Leaves broadly oval or oblong-lanceolate, 

 mucronate, serrate, or entire ; petioles glandular. Flowers in axillary 

 racemes, short, erect ; segments of the calyx acute, whitish. Petals 

 nearl}* orbicular. Fruit a dark red, globular drupe, very astringent. — 

 White. $ . March— April. Near Columbia, S. C. 10—30 feet, 



Choke Cherry. 



2. C. seroti'na, (D. C.) A large tree, with spreading, smooth branch- 

 es. Leaves oval, lanceolate, acuminate, generally glabrous, somewhat 

 lucid, serrate; petioles with glands. Flowers in elongated racemes. 

 Petals nearly orbicular. Drupes b early black, eatable. — White. ^. 

 April — May. In rich sods. 30 — 80 feet. Wild or Black Cherry. 



3. C. Carolima'na. (Midi.) An evergreen tree of ornamental growth. 

 /,- i es oblong-lanceolate, Blightly acuminate, mucronate, entire, or ser- 

 rate, coriaceous, shini:t_ r above ; petioles short. Flowers in dense ra- 

 cemes, from the axils of the leaves of the preceding season. Petals 

 small, obovate. Stamens long. Drupe black, persistent, dry. — White. 

 ^ . March — April. On the Congaree, near Columbia. Middle Geo. 



Scb-Order III.— ROSA/CE/E. 



Calyx inferior, 3 — 5-cleft. Ovaries solitary or several. Fruit 

 follicular, 1 — 10-seeded, or achenia. 



