148 Flora of the Providence Mountains. [ZOE 
higher altitudes are well supplied with Pinus monophylla and 
there is a considerable amount of Juniperus Utahensis; the only 
other shrubby vegetation of any size worthy of note is Quercus 
chrysolepis, some Garrya favescens and an abundance of Rhus 
aromatica trilobata. 
The following list of the plants collected is not complete, many 
of those of wide distribution having been omitted: 
Delphinium scaposum Greene. 
Eschscholtzia minutiflora Watson. 
Arabis perennans Watson. 
Arabis Flolboellit Fendleri Watson. 
Caulanthus crassicaulis glaber Jones. 
Stanleya pinnalifida Nutt. 
Sisymbrium diffusum Gray. 
Lesquerella Utahensis Rydberg. 
Lepidium Fremonti Watson. This species is represented by 
two forms: one with orbicular pods and sparingly-lobed leaves, 
the other with rhombic pods, cuneate at base, and leaves much 
lobed. 
Silene montana Watson. 
Arenaria Fendleri Gray. Flowers light yellow. 
Spheralcea ambigua Gray. 
Linum Lewisii Pursh. 
Larrea Mexicana Moric. 
Rhamnus Californica tomentella Brewer and Watson. 
Rhamnus crocea Nutt. Very abundant. 
Rhus aromatica trilobata Gray. 
Hosackia sp. belonging to the A. Wrightii group and by its 
characters most nearly related to H. Neo-Mexicana. ; 
Lotus argensis Coville. This species is also common in cafions 
of the eastern side of the mountains of San Diego County where 
it is known as Hosackia rigida. 
Petalostemon Searlse Gray. 
‘Astragalus Mojavensis Watson. 
Astragalus eriocarpus Watson. 
Astragalus playanus Jones. 
Cassia armata Watson. 
