254 BOTANY. 



Engelm. PI. Lindh. 114. — Much stouter than the last, 2-4' high, below 

 1" in diameter, olive-green or light brownish; branches spreading, often 

 recurved ; staminate flowers few and scattered, or in 3-7-flowered spikes, 

 1" in diameter, with ovate, acute lobes ; inflorescence often bearing sterile 

 branches from the same axils as the fruiting ones and behind them ; fruit 

 l£-lf" long 



On Nut-pines (P. edulis and monophyllos) from Southern Colorado 

 through New Mexico to Arizona, G K. Gilbert, 1873 (116), Dr. J. B. 

 Girard, 1874. Flowers August and September. Intermediate in size and 

 color between the last- and the following; well marked by its divaricate 

 habit and its scanty flowers. 



Arceuthobitjm robustum, Engelm. PI. Fendl. p. 59 ; A. cryptopodum, 

 Engelm. PI. Lindh. p. 214. — Stout, 2-4' high, 2-3" thick at base, panicu- 

 late, much branched, brownish-yellow to dark olive-brown; staminate plants 

 smaller than the pistillate ones ; staminate spikes with much-compressed, 

 adpressed buds; flowers mostly 3-parted, 1^-1^" wide; anthers attached 

 above the middle of the ovate, acute lobes ; ripe fruit 2 J" long. 



Only on Finns ponderosa, Colorado, New Mexico, and Arizona; Camp 

 Apache (G. K. Gilbert, 1873) and Mount Graham (Rothrock, 787), 1874. 

 Flowers in June. Fruit mature in August and September. The closely 

 allied A. occidentale, Engelm., is distinguished by more elongated spikes, 

 ventricose, divaricate buds of the staminate, mostly 4-parted, larger flowers, 

 with lanceolate, acuminate lobes and anthers attached below their centre ; 

 it also occurs on Pinus ponderosa, but more frequently on other Conifers. 

 Both persist for several years, the female plants always longer than the male. 



SANTALACE^E. 



Comandra pallida, var. angustifolia, Alph. DC — Rocky Canon, 

 Arizona (273). 



Comandra umbellata, Nutt. — Nevada. 



