582 Part IV. Chapter 3. 
confined to the Chisos, Davis and Guadalupe Mountain ranges from 6000 feet 
on northeast slopes to the tops of the ranges. It represents the Transition 
Zone of MERRIAM'). It is the home of the wild potato Solanum tuberosum 
var. boreale. 
That characteristic plants of the above three mountain ranges are displayed 
in the list: 
N Dee Davis Chisos 
Pinus ponderosa Dougl. 
© 2 BeERINS james. ar ae 
ee Douglasii Cam: (= P. mucronata | 
++ 
-+ 
Acer EEE I A 
Quercus grisea Liebm. ES 
» es Re 
- texana Buckley . Rs RE | 
> undulata Torr. . | 
Prunus serotina Ehrh. var. nee: 
Rhamnus Purshiana DC. Be 
Amelanchier alnifolia Nutt. . . . . . . 
Ceanothus Greggii A. Gray. 
Robinia neomexicana A. Gray 
Solanum tuberosum L. var. börenle A. Gr 
I++l+++++ 
| 
| 
| 
F+tHt+ I +1 I 4+++ + f 
| 
- 
The timber of the Davis Mountains is typic. Omitting the small areas of 
Pinus ponderosa, the mountains, ridges and mesas are covered with trees whose 
short trunks and brown crowns produce a park-like appearance. 
The grasses of the pine forest are Mühlenbergia Porteri, Panicum bulbosum, Poa Eatoni, : 
Bouteloua oligostachya, Stipa comata, Andropogon hirtiflorus, Agropyrum pseudorepens, Aristida 
arizonica and ap — Everywhere through the forest are ER, open parks Park For 
mation: from a few acres to several miles in area. Here e Stipa neomexicana, S. so h 
Be Dongieni, Aster (Mac ge tanacetifolius, A ae canescens, HymenopappuS mei 
canus, Actinella (Pieradenia) Rusbyi, ia multiflora, erannn cernuum, Astragalus Hosackiae, 
. many Eritrichlums, About the springs grow Iris missouriensis, Epilobium paniculatum, Campa- 
nula Scheuchze ; 
Up the Sail rough canyons formed by erosion creep many lowland plants and down them i 
come Ey from te highlands producing a varied flora (Canyon Formation), viz: Pentstemon 
Palmeri, Prunus demissa, Spiraea millefolium, Holodiseus discolor, Cowania mexicana, Fe = 
ua Sambucus glaucus, Lonicera involucrata, Lupinus rivularis, Ivesia depauperata, Heliantbus 
GE N Bl e Ep Zn I STEH VE 
Maximiliani. — Spiraea caespitosa, a stout shrub, grows on the rocky margins of these 
canyons Base to sweeping storms. In its company grow Eriogonum deflexum, E. micro ecum 
and E. flavum. — Barfoot Park in the Chiricahua Mountains (8000 feet) was characterized 
ı) BAILEY, ee Biological Survey of Texas. North American Fauna No, 25, U. 8. Biolo" 
gical Survey 1905: —38. 
