WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 409 
KEY TO THE SPECIES. 
Leaves evergreen, thick; flowers axillary in small clusters; wood 
of stems very hard. .............202 eee e eee e cece eeee 1. R. choriophylla. 
Leaves deciduous, thin; flowers in dense terminal panicles; wood 
of stems soft, with large pith. 
Rachis winged; leaflets densely pubescent beneath, of the 
same color on both surfaces............. eee eee eee 2. R. lanceolata. 
Rachis not winged; leaflets glabrous and paler beneath....... 3. R. cismontana. 
1. Rhus choriophylla Woot. & Standl. Contr. U. 8. Nat. Herb. 16: 146. 1913. 
Tyre Locality: Guadalupe Canyon, New Mexico. Type collected by E. A. 
Mearns (no. 699). 
RanGeE: Southern New Mexico and Arizona and adjacent Mexico. 
New Mexico: Guadalupe Canyon; San Andreas Mountains; Organ Mountains. 
Dry hills and canyons, in the Upper Sonoran Zone. 
2. Rhus lanceolata (A. Gray) Britton in Britt. & Shaf. N. Amer. Trees 606. 1908. 
Rhus copallina lanceolata A. Gray, Bost. Journ. Nat. Hist. 6: 158. 1850. 
Schmaltzia lanceolata Small, Fl. Southeast. U. 8. 728. 1903. 
TypE Loca.ity: Rocky soil and high prairies, New Braunfels, Texas. 
Ranae: Central Texas to southeastern New Mexico. 
New Mexico: Queen; San Andreas Mountains. Dry hills and canyons. 
Our specimens are not altogether typical, the pubescence being more abundant 
and spreading than is usual, while the leaflets are smaller and the inflorescence shorter. 
3. Rhus cismontana Greene, Proc. Washington Acad. Sci. 8: 189. 1906. 
Rhus sorbifolia Greene, op. cit. 195. 1906. 
Type Locauiry: Thomas County, Nebraska. 
Rance: Utah'and North Dakota to New Mexico and Arizona, 
New Mexico: Sandia Mountains; mountains west of Las Vegas; Kingston; Mogo- 
llon Creek; Guadalupe Canyon; White Mountains. Along streams, in the Transition 
Zone. 
The type of Rhus sorbifolia was collected in the mountains near Las Vegas. 
84. CELASTRACEAE. Staff-tree Family. 
Low shrubs, sometimes spiny; leaves simple, small, alternate or opposite; flowers 
normally cymose, small and inconspicuous, perfect; calyx and corolla 4 or 5-merous; 
stamens 4 to 10, inserted on a disk lining the hypanthium; fruit a capsule, drupe, 
or berry, the seeds often arillate. 
KEY TO THE GENERA. 
Stamens 10; plants spiny; stems green...............----- 1. Forse.uesta (p. 409), 
Stamens 4 or 5; plants not spiny; stems yellowish or 
brown. 
Flowers 4-merous; fruit a 2-valved capsule; leaves 
opposite, smooth............... 2. cece ween eee 2. Pacuistmma (p. 410). 
Flowers 5-merous; fruit indehiscent; leaves alternate, 
SCULLY... 0... eee eee eee eee ee eee eee eeeeee-+s 3 Mortonia (p. 410), 
1. FORSELLESIA Greene. 
A spiny green-stemmed shrub 30 to 40 cm. high or less, with small obovate acute 
leaves 1 cm. long or smaller, these nearly smooth, short-petioled, entire; flowers small, 
pentamerous, white. 
