* Atriplex hymenelyira 
* Atriplex canescens 
Atriplex Torreyi 
Grayia spinosa 
* Eurotia lanata 
* Allenrolfia occidentalis 
Sarcobatus vermiculatus 
Lepidium Fremontit 
*Isomeris arborea 
*Tsomeris arborea globosa 
*ITsomeris arborea angustata 
Fallugia paradoxa 
Cowania Stansburiana 
* Coleogyne ramosissima 
Kunzia glandulosa 
Amygdalus Fremontit 
*Strombocarpus pubescens 
* Prosopis glandulosa 
* Krameria parvifolia 
Parosela arborescens 
* Parosela californica 
Parosela Fremonti 
Parosela Saundersi 
*Covillea tridentata 
*Thamnosma montanum 
*Opuntia ramosissima 
*Opuntia Bigelovit 
*Opuntia acanthocarpa 
*Opuntia echinocarpa 
*Opuntia Covillei 
*Opuntia chlorotica 
(321) 
*Gaertneria dumosa 
* Hofmeisteria pluriseta 
*Coleosanthus atractyloides 
Coleosanthus incana 
*Coleosanthus linifolia 
*Coleosanthus desetorum 
Coleosanthus Knappiana 
Gutierrezia lucida 
*Acamptopappus sphaeroce- 
phalus 
*Stenotopsis interior 
Ericameria monactts 
Acamhiacyris Fremontit 
* Chrysothamnus teretifolius 
Chrysothamnus mohavensts 
*Chrysothamnus occidentalis 
* Baccharis Emoryt 
* Baccharis sergilioides 
* Baccharts glutinosa 
* Pluchea sericea 
* Bebbia juncea aspera 
* Viguiera Parisht 
* Encelia actont 
* Encelia frutescens 
Artemesia Parishit 
* Lepidospartum squamatum 
* Peucephyllum Schotti 
Tetradymia glabrata 
Tetradymia stenolepis 
Tetradymia spinosa 
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. 
