WOOTON AND STANDLEY—FLORA OF NEW MEXICO, 327 
2. PRUNUS L. P.vumM. 
Low, treelike or spreading shrubs, 3 meters high or less, forming thickets; branches 
stout, rigid, somewhat spiny; bark grayish; leaves sharply serrate; flowers white, 
produced before the leaves; fruit ellipsoidal, red, the stone flattened, acute on both 
edges. 
KEY TO THE SPECIES. 
Leaves pubescent beneath; petals 4 to 6 mm. long......-.-.-.----- 1. P. watsont. 
Leaves glabrous; petals 8 to 16 mm. long ........--.------+---+-- 2. P. americana. 
1. Prunus watsoni Sarg. Gard. & For. '7: 134, f. 25. 1894. SAND PLUM. 
Prunus angustifolia watsoni Waugh, Rep. Vt. Agr. Exp. Sta. 12: 239. 1899. 
TypE Locauity: Ellis, Kansas. 
Rance: Nebraska to Texas and eastern New Mexico. 
New Mexico: Nara Visa (Fisher 205). Plains, in the Upper Sonoran Zone. 
2. Prunus americana Marsh. Arb. Amer, 111. 1785, WILD PLUM. 
Typr Locauity: Not definitely stated. 
Ranar: Montana and New York to Florida and New Mexico. 
New Mexico: Taos; Pecos; Farmington; White Mountains. 
In some parts of the State this plum is almost certainly native; in other places it 
may have been introduced. At Taos the trees are abundant and the fruit is gathered 
by the Indians. At Farmington the small trees are very numerous along some of the 
irrigating ditches. 
Some similar species has escaped rather abundantly near Mesilla. 
8. CERASUS L. CHERRY. 
A small slender tree 3 to 4 meters high, with smooth purplish or reddish brown bark, 
slender virgate branches, and corymbose white flowers; leaves 3 to5 cm. long, oblong- 
elliptic, slightly attenuate to the base, acute or abruptly short-acuminate, crenulate, 
on petioles 1 cm. long or less; corymbs about 4-flowered; hypanthium campanulate, 
glabrous; petals small, white; fruit ovoid, red; stone ovoid. 
1. Cerasus crenulata Greene, Proc. Biol. Soc. Washington 18: 56. 1905. 
TypE LOCALITY: West Fork of the Gila, Mogollon Mountains, New Mexico. Type 
collected by Metcalfe (no. 587). 
Rance: Mountains of southwestern New Mexico. 
New Mexico: Mogollon Mountains; Hillsboro Peak. Transition Zone. 
The fruits when ripe are a bright cherry red, ellipsoidal, 1 cm. long or less, and de- 
cidedly acid as well as somewhat astringent. 
67. MIMOSACEAE. Mimosa Family. 
Shrubs or suffrutescent perennials with usually spiny stemsand bipinnate leaves with 
usually numerous small leaflets; flowers regular, small, in axillary pedunculate heads 
or spikes; calyx 4 or 5-parted (sometimes wanting in Acuan); corolla of 4 or 5 distinct 
or united petals; stamens 5 to 10 or numerous, distinct or united; fruit a more or less 
flattened, dehiscent or indehiscent legume. 
KEY TO THE GENERA. 
Stamens numerous, always more than 10, distinct or 
monadelphous. 
Corolla gamopetalous, tubular; stamens monadel- 
phous; low plants with unarmed stems. -..-. 1. CALLIANDRA (p. 328). 
Corolla polypetalous; stamens distinct; plants more 
or less shrubby and spiny (except in A. cus- 
prdata)... 2-2-0. . cence eee eee ence eee e eens 2. Acacta (p. 328). 
