VEGETATION GROUPS OF THE DESERT LABORATORY DOMAIN. 107 
The following brief summary will be interesting to the botanist from the 
standpoints of taxonomy, and phytogeography: 
PCE aC EV Ge ES 7 Se ee a ee er ee Oe eee ee ee 68 
paerees ROE TICE ire Mer mre Penn ar ey We oats, 9s oh ss 3, neal Ede Be ea ree ier slesohs 269 
Miduoeto. eeuera Common to both hemispheres 2.0095 5. fem so ws A epeeimns @ as es 126 
Number of genera common to North and South Ameérica........5....2....4.. 58 
Dre ersueSOris yy ester t Senet ei. oe Oe do efece 8 a wel lA Oh Shc g Rie lace dink 39 
Peter wore to uGec OC CUCTO stein. 25.6% cacy seen ecm alive aN overuse sickle ajeus 22 
CONGRATS Ls EL! UES Sa aw, gee calaehelzae a Sie eee ae eta We eat Pe iad © og re 449 
eter ee avec reli SUECICS sc or. sow se aie tie ate Seo On raises alge tee atrans 264 
*Names preceded by an asterisk denote bulbous, tuberous, or fleshy-rooted plants. 
tNames preceded by a dagger denote plants growing in alkaline situations. 
{The Roman numeral at the end of certain lines indicates an additional area on which the species 
thus marked occurs. 
I. Tumamoc HI. 
TREES. 
Cereus giganteus Engelm. 
=Carnegiea gigantea (Engelm.) Britt. 
and Rose. 
Parkinsonia microphylla Torr. 
SHRUBS. 
Acacia constricta Benth. (II).t 
Celtis pallida Torr. (II). 
Echinocactus wislizeni Engelm. (II). 
Fouquieria splendens Engelm. 
Hyptis emoryi Torr. 
=Mesospherum emoryi (Torr.) 
Kuntze. 
Jatropha cardiophylla (Torr.) Muell. Arg. 
Lippia wrightii Gray. 
Lycium berlandieri Dunal. 
Lycium fremontii Gray. 
Opuntia arizonica Griffiths. 
Opuntia blakeana Rose. 
Opuntia discata Griffiths. 
Opuntia leptocaulis DC. 
Opuntia versicolor Engelm. 
Opuntia toumeyi Rose. 
Simmondsia californica Nutt. 
WOODY CLIMBERS. 
Janusia gracilis Gray. 
Nissolia schottii (Torr.) Gray. 
DWARF SHRUBS. 
Aplopappus laricifolia Gray 
= Chrysoma laricifolia (Gray) Greene, 
Ayenia microphylla Gray. 
Cactus grahami (Engelm.) Kuntze. 
Calliandra eriophylla Benth. 
Carlowrightia arizonica Gray. 
-Hermannia pauciflora Wats. 
Hibiscus coulteri Harvey. 
Hibiscus denudatus Benth. (II). 
Krameria canescens Gray. 
Krameria glandulosa Rose. 
Phoradendron californicum Nutt. (II). 
Polygala macradenia Gray. 
Siphonoglossa longiflora (Torr.) Gray. 
I. Tumamoc Hii1-—Continued. 
HALF-SHRUBS. 
Abutilon incanum (Link) Sweet. 
Abutilon lemmoni Wats. 
Arabis eremophila Greene. 
Boerhaavia scandens L. 
Brickellia coulteri Gray 
=Coleosanthus coulteri(Gray) Kuntze. 
Cassia covesii Gray (II). 
Ditaxis sp. 
Dysodia porophylloides Gray. 
Dalea parryi T. & G. 
== Parosela parryi (1. & G.) Heller. 
Encelia farinosa Gray. 
Franseria deltoidea Torr. (II) 
= Geertneria deltoidea (Torr.) Kuntze. 
Galium stellatum Kellogg. 
Haplophyton cimicidium (Pav.) A.DC. 
Hilaria mutica (Buckl.) Benth. (II). 
Menodora scabra Gray (II). 
Parthenium incanum H. B. K. 
Porophyllum gracile Benth. (II). 
Senecio lemmoni Gray. 
Spheralcea pedata Torr. (II). 
Stephanomeria pauciflora (Torr.) (IT) 
=Ptiloria pauciflora (Torr.) Raf. 
Trixis californica Kellogg. 
PERENNIAL HERBS. 
Abutilon crispum (L.) Medic. 
Allionia incarnata L., var. (II) 
=W edelia incarnata (L.) Kuntze, var. 
* Allium reticulatum Don. (11). 
Andropogon contortus L. 
Andropogon torreyanus Steud. (II). 
* Anemone sphenophylla Poepp. 
Aristida divergens Vasey (II). 
Aristida humboldtiana Trin. & Rupr. (11) 
Aristida purpurea Nutt. (II). 
Aristida scheidiana Trin. & Rupr. (II). 
Bouteloua bromoides (H. B. K.) Lag. 
Bouteloua curtipendula (Michx.) Torr. 
*Brodiea capitata Benth. (II). 
*Calochortus kennedyi Porter. 
Cassia bauhinioides Gray (II). 
Cheilanthes wrightii Hook. 
