( 321 ) 
* Atriplex hymenelytra *Gaertneria dumosa 
* Atriplex canescens * Hofmeisteria pluriseta 
Atriplex Torreyi *Coleosanthus atractyloides 
Grayia spinosa Coleosanthus incana 
* Furotia lanata *Coleosanthus linifolia 
* Allenrolfia occidentalis *Coleosanthus desetorum 
Sarcobatus vermiculatus Coleosanthus ee 
Lepidium Fremontit Gutterrezia Luci 
*Isomeris arborea *Acamptopappus aie 
*Isomeris arborea globosa phalus 
*Isomeris arborea angustata *Stenotopsis interior 
Fallugia paradoxa Ericameria monactis 
Cowania Stansburiana Acamhiacyris Fremontit 
*Coleogyne ramosissima *Chrysothamnus teretifolius 
Kunsia glandulosa hrysothamnus mohavensis 
gdalus Fremontti *Chrysothamnus occidentalis 
*Strombocarpus pubescens *Baccharis Emoryi 
* Prosopis glandulosa * Baccharis sergilioides 
* Krameria parvifolia * Baccharis glutinosa 
Parosela arborescens * Pluchea sericea 
* Parosela californica * Bebbia juncea aspera 
Parosela Fremontit * Viguiera Parishi 
Parosela Saunderst *Encelia actont 
* Covillea tridentata *Encelia frutescens 
*Thamnosma montanum Artemesia Parishii 
*Opuntia ramosissima * Lepidospartum squamatum 
*Opuntia Bigelovit * Peucephyllum Schotiit 
*Opuntia acanthocarpa Tetradymia glabrata 
*Opuntia echinocarpa Tetradymia stenolepis 
*Opuntia Covillei Tetradymia spinosa 
*Opuntia chlorotica 
The species designated by an asterisk (*) also occur in the 
Colorado Desert. 
Colorado Desert——Covillea is also the predominant plant over 
the dry mesas of the Colorado Desert. Above this belt is an area 
corresponding to the yucca belt of the Mohave Desert, but com- 
prising a very different group of plants,® of which Agave deserti 
is the most characteristic. 
8Parish, Bot. Gaz. 36: 222. 1903. 
