80 
Peunus Vikginiana, L. (!) Scarcely flowering specimens only, from 
trees having a very different liabit from the next, 15° high and 6-10' in di- 
ameter, in a locality where P. demusa was but 2° high, with thinner leaves 
and short racemes, (2' long.) The young racemes have unusually large mem- 
branous bracts, and the stipules are likewise conspicuous. West Humboldt 
Mountains, Nevada ; 9,000 feet altitude. The species is found from New- 
foundland to Louisiana and the Arctic Circle, in New Mexico, Colorado and 
northward. It has not hitherto been reported from west of the Rocky 
Mountains. (301.) 
Prunus demissa, Walp. {Cerasus, Nutt.) Glabrous; leaves thickish, 
obovate or oval, abruptly pointed, sharply (often doubly) serrate with straight 
teeth, petiole mostly biglandular ; racemes 3-4' long, densely flowered ; petals 
orbicular, 2" in diameter ; fruit purphsh -black. — Shrubby, often fruiting 
freely at the height of two feet, but reaching 12° in height in favorable locali- 
ties, and 4-6' in diameter ; wdth the thick leaf of P, serotina and a pleasanter 
fruit, it otherwise more resembles P. Virginiana, and is also commonly known 
as the "choke cherry." In the mountains from the Columbia to Southern 
California ; New Mexico, (Fendler.) Frequent in Nevada and Utah, from 
the Washoe Mountains to the Wahsatch ; 5-10,000 feet altitude ; flowering 
in May and June, fruit ripening in September. A variety was met with 
having the fruit light-red, larger, more juicy, and with a thiuner skin. (302.) 
Spir^a opulifolia, L. From Georgia to Missouri and northward to 
Canada and the Saskatchewan ; also in Oregon, California, and New Mexico, 
(Bigelow.) Frequent in the Tuilla, Wahsatch and Uinta Mountains, Utah ; 
5,000 feet altitude. (303.) 
Var. PAUCIFLORA, Hook. Leaves smaller, nearly glabrous ; corymb few- 
flowered ; carpels 2-4 or sometimes solitary, tomentose.' — These specimens 
from several stations in the East Humboldt Mountains, Nevada, and from 
Stansbury Island in Salt Lake, have the leaves for the most part tomentose 
with a minute stellate pubescence, especially beneath, sometimes nearly 
glabrous ; corymbs 5-10-flowered, very shortly peduncled or sessile, flowers 
rather smaller ; ovary always solitary ; stamens 20, or sometimes 15. A 
small shrub, 2° high ; certainly as deserving the rank of a species as the fol- 
lowing. (304.) 
Spir^a dumosa, Nutt. {S. armfoUa, Var. discolor , T. & G.) Leaves 
broadly ovate, cuneate and petioled, obtuse, sublobate and dentate, the serra- 
