114 
ROSACEJE. (ROSE FAMILY.) 
Tribe 3. ROSE^E.—Pistils numerous, forming long achenia, which 
are inserted on the hollow receptacle that lines the urn-shaped 
and fleshy calyx-tube. Calyx-segments imbricated. 
17. Rosa. Leaves pinnate : stipules cohering with the petiole. 
Suborder III. POME-dE. 
Calyx-tube thick and fleshy in fruit (forming a pome), including 
and cohering with the 2-5 ovaries. 
18. Crataegus. Carpels bony in fruit, 1-seeded. 
19. Pyrus. Carpels thin or cartilaginous in fruit, 2-seeded. 
20. Amelanchier. Carpels cartilaginous, each divided into 2 cells 
by a partition : cells 1-seeded. 
Suborder I. AMYGDALEiE. Almond Family. 
1. PRUNUS, Tourn. Plum. 
Calyx 5-cleft. Petals 5, spreading. Stamens 15 - 30. Ovary 
with 2 pendulous ovules. Drupe ovoid or oblong, usually covered 
with a bloom ; the stone smooth, sharp-edged and pointed, and the 
margins mostly grooved. — Small trees or shrubs ; the leaves ser¬ 
rate, rolled up in the bud. Flowers white, usually preceding the 
leaves, from lateral buds, the pedicels in simple umbel-like clus¬ 
ters. (The ancient classical name of the Plum.) 
L P« Iliaritima, Wang. (Beach Plum) Low and straggling 
(2° - 5°) j leaves ovate or oval, finely serrate , softly pubescent under¬ 
neath ; pedicels short, pubescent; fruit globular, purple or crimson 
with a bloom (4 ; —F in diameter). (P. littoralis, Bigelow.) — ^ a ‘ 
ries, when at some distance from the coast, with the leaves smoother 
and thinner, and the fruit smaller. (P. pygmaea, Willd.) — Sea-beach 
and the vicinity, Massachusetts to New Jersey. April, May. — F rU,t 
pleasant-tasted when fully ripe. 
2. P. Americana, Marsh. (Wild Yellow Plum.) Leaves 
ovate or obovate , conspicuously pointed, sharply and often doubly ser¬ 
rate, very veiny, smooth when mature; fruit roundish-oval (£*-* F 10 
diameter), nearly destitute of bloom. — River-banks, common : also 
cultivated, when the juicy fruit becomes pleasant-tasted, though with 
a tough acerb skin. It is yellow or orange, often tinged with red. 
Tree or bush thorny, 8°- 15° high. 
3*P* spinosa, L. (Sloe. Black Thorn.) Branches thorny > 
leaves obovate-elliptical, downy beneath, sharply doubly-toothed 
pedicels solitary ; fruit (small) globular. — Sparingly naturalized : so 
also is 
4. P. instltia, L. (Bullace Plum.) Branches thorny i 
