2 Part IH. Chapter 3. 
Arenicolous Species. 
Abronia maritima Nutt. 
» umbellata Lam. 
Amblyopappus pusillus H. & A. 
Aphanisma blitoides Nutt. 
Atriplex leucophylla Dietr. 
» microcarpa Dietr. 
Calandrinia maritima Nutt. 
Convolvulus soldanella L. 
Franseria (Gaertneria) bipinnatifida Nutt. 
Mesembryanthemum aequilaterale Haw. 
» crystallinum L. 
e nodiflorum Haw. 
Oenothera viridescens Hook. (= O. 
cheiranthifolia Hornem.). 
Halophilous Species. 
Astragalus pycnostachys A. Gray. 
Atriplex hastata L. 
Batis maritima L. 
Jaumea carnosa A. Gray. 
Juncus acutus L. var. 
Monanthochloe littoralis Engelm. 
Salicornia ambigua Michx. 
» herbacea L. 
» mucronata Bigel. (= 5. Bi- 
gelovii Torr.). 
Scirpus Tatora Kunth (= S. riparius 
I.&C,.Presl) 
Spartina glabra Muhl. [A. Gray. 
Statice limonium L. var. californica 
A small group of plants which have entered southern California directly 
from lower California inhabit a narrow strip along the coast. 
Some barely 
pass the border; few penetrate very far within it, and the last one disappeafs 
at Santa Barbara. 
However, the plants below form a southern element of 
invasion and must be mentioned in this connection. 
Acalypha californica Benth. 
Agave Shawii Engelm. 
Arctostaphylos diversifolia Parry. 
Baccharis sarothroides A. Gray. 
Beloperone californica Benth. 
Cereus Emoryi Engelm. 
Cneoridium dumosum Hook. 
Dithyrea californica Haw. 
Frankenia Palmeri Wats. 
Isomeris arborea Nutt. 
Iva Hayesiana A. Gray. 
Opuntia prolifera Engelm. 
» serpentina Engelm. 
Simondsia californica Nutt. 
Viguiera laciniata A. Gray. 
6. Western Desert Regions. 
General Remarks. A physiographic, floristic and meteorologic study © 
western North America has resulted in the delimitation of two 8 
reat desert 
regions. These may be designated as the Sonora-Nevadan Desert MM 
the Chihuahuan Desert. 
portions of Utah, Idaho, Oregon, Washington, Nevada, California, A 
Baja California, Sonora and Sinaloa. The northern portion of the reg! 
ä es 
The Sonora-Nevadan desert region embrac® 
rizona, 
on 5 
mainly comprised in the Great Basin and includes the beds of a number © 
ancient lakes and the surviving Great Salt Lake. Other special physiogt 
features of interst in this connection are the areas which bear the 
Snake River Desert of Idaho; the sage plains of Washington; the 
of.Oregon; the Ralston Desert in Nevada; Death Valley; Mohave, Colo 
Salton deserts in southern California and Arizona; the Painted Desert in 
aphic 
name of 
java bed 
rado, 
