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ADJACENT TO HORTICULTURAL HALL. 73 

Potentilla. CrnQueroiL, Five-FinGer. Usually herbs, with the 1-seeded 
fruits heaped into a little head; calyx with 5 small leaves alternating with its 
lobes and outside of them. We have in the Park a single shrubby species : 
Potentilla fruticosa, Zinmeus. SuRUBBY CINQUEFOIL. Is from I to 4 
feet high, branched and silky; compound leaves made up of § to 7 entire, 
broadly lanceolate leaflets. Native. 
Prunus. Prum, CHERRY, PEACH, ALMOND, etc. Trees or shrubs with a 
single pistil, which develops into a stone fruit; flowers white or rose color, or 
white with a rose blush. The edible fruits are well known. In Eastern coun- 
tries the fruit and bark of some are used as remedies. The genus was formerly 
divided into a number of others, such as Amygda/us, the Almond, Peach, and 
Nectarine group; Cerasus, the Cherry group. 
* Prunus Alleghaniensis, Porter. A branching straggling shrub, seldom 
thorny; leaves lanceolate to obovate; flowers 2 to 4 in a cluster; fruit dark 
purple, globose ovoid, under ¥% inch in length, stone “ with a shallow groove 
on one side anda broad flat ridge on the other.” From the mountains of 
Pennsylvania. ! 
* Prunus Americana, Marshal/. Wi_p YELLOw or RED PLUM. (Cera- 
sus Canadensis, Loiseleur.) Ovate leaves conspicuously pointed, sharply 
double-toothed ; flowers white, not many in a cluster, appearing about the 
time the leaves do; orange or red fruit over % inch in diameter, or larger 
in cultivation; stone sharp on each margin; pulp of fruit pleasant, but skin 
astringent, bitter, and sour. A thorny native, 8 to 20 feet high. 
Prunus Caroliniana, Azton. MocK-ORANGE. A small tree from the 
Southern States, with the white flowers in clusters from the axils of the thick, 
evergreen, broadly lance-shaped, entire leaves. Hardiness doubtful. 
Prunus Cerasus is the common garden RED CHERRY. Now growing in 
portions of the Park. 
* Prunus Chicasa, Michaux. CHICKASAW PLUM. Native shrub 6 to 12 
feet high. Somewhat thorny; leaves long and narrow, sharp-pointed, finely 
toothed ; fruit round, well tasted, and over % inch in diameter. 
Prunus Lauro-Cerasus, Zimneus. CHERRY LAUREL. (Cerasus Lauro- 
Cerasus, Loiseleur.) \eaves thick and leathery, broadly lance-shaped, sparingly 
toothed, resembling those of the common Orange. Not hardy. Poisonous, 
from the abundance of prussic acid. 
* Prunus maritima, Wangenheim. Bracu PLuM. Low shrub, native 
along our sea-shores; flowers white, appearing in early spring; leaves oval, 
sharp-pointed, decidedly veiny, deeply and doubly serrate; fruit 4% to I inch 
in diameter, stone sharp on one edge and a little grooved on the other. 
Prunus nana, ? DwarF or FLOWERING ALMOND. Has short clus- 
ters of mostly double flowers appearing before the leaves in spring, naturally 
rose-colored, but by variation white, A low, much-branching shrub, intro- 
duced into cultivation from the Calmuck region in Asia. 

Prunus Pennsylvanica, Zinneus. Wid Rep CHERRY. (Cerasus 
Pennsylvanica, Seringe.) A small indigenous tree with shining green, smooth, 

