FLORA OF THE SANTA CATALINA MOUNTAINS. 41 
nately establish and break the connections between the vegetations of 
the various mountain ranges and elevated plains, thereby permitting the 
dispersal and subsequent isolation of species which might find no means 
of movement across the desert valleys under existing conditions. 
LIST OF CHARACTERISTIC SPECIES. 
The lack of a single taxonomic work covering the entire flora of the 
Santa Catalina Mountains makes it desirable to bring together here a 
list of the plant names which are used throughout this paper, together 
with some of the commoner synonyms. The list comprises only those 
plants which are common and characteristic components of the vege- 
tation of some particular region or habitat of the mountain. The writer 
wishes to express here his very great indebtedness to Professor J. J. 
Thornber, of the University of Arizona, for determining numerous sets 
of plants from the Santa Catalinas and for verifying the following list. 
POoLYPODIACER: 
Aspidium filiz-mas (L.) Sw. 
= Dryopteris filiz-mas (L.) Schott. 
Asplenium trichomanes L. 
Cheilanthes fendleri Hook. 
Cheilanthes lindheimeri Hook. 
Cheilanthes wrightit Hook. 
Cystopteris fragilis (L.) Bernh. 
= Filiz fragilis (L.) Underw. 
Gymnopteris hispida (Mett.) Underw. 
=Gymnogramme hispida Mett. 
Notholena ferruginea (Desv.) Hook. 
Notholena hookeri D. C. Eaton. 
Notholena sinuata (Sw.) Kaulf. 
Pellea wrightiana Hook. 
Pteris aquilina var. pubescens Underw. 
Woodsia mexicana Fee. 
EQUISETACEZ: 
Equisetum robustum A. Br. 
SELAGINELLACES: 
Selaginella rupincola Underw. 
Selaginella sp. 
PINACEE: 
Abies arizonica Merriam. 
Abies concolor Lindl. & Gord. 
Cupressus arizonica Greene. 
Juniperus pachyphlea Torr. 
Pinus arizonica Engelm. 
Pinus cembroides Zuce. 
Pinus chihuahuana Engelm. 
Pinus strobiformis Engelm. 
Pseudotsuga mucronata (Raf.) Sudw. 
= Pseudotsuga taxifolia (Lam.) Britton. 
GNETACEB: 
Ephedra trifurca Torr. 
GRaMINEE: 
Agrostis scabra var. subrepens Hitchck. 
Andropogon saccharoides Sw. 
=Amphilophis saccharoides (Sw.) Nash. 
Andropogon scoparium Michx. 
Aristida americana var. bromides (H. B. K.) 
Scribn. & Merr. 
Aristida divergens Vasey. 
Aristida scheidiana Trin. & Rupr. 
Bouteloua aristidoides (Kunth) Griseb. 
Bouteloua curtipendula (Michx.) Torr. 
GramMInEx—Continued: 
Bouteloua hirsuta Lag. 
Bouteloua oligostachya (Nutt.) Torr. 
Bouteloua polystachya (Benth.) Torr. 
Bouteloua rothrockit Vasey. 
Bromus richardsonii Link. 
Diplachne dubia (Nees) Benth. 
Eragrostis lugens Nees. 
Eragrostis neomexicana Vasey. 
Eragrostis pilosa (L.) Beauv. 
Heteropogon contortvs (L.) Beauv. 
Hilaria cenchroides H. K. B. 
Hilaria mutica (Buckl.) Benth. 
Keleria cristata (L.) Pers. 
Leptochloa mucronata (Michx.) Kunth. 
Muhlenbergia affinis Trin. 
Muhlenbergia dumosa Scribn. 
Muhlenbergia distichophylla (Presl) Munro. 
Muhlenbergia gracillima Torr. i 
Muhlenbergia porteri Scribn. 
Muhlenbergia vaseyana Scribn. 
Muhlenbergia virescens (H. B. K.) Trin. 
Muhlenbergia sp. é 
Panicularia nervata (Willd.) Kze. 
Panicum bulbosum H. B. K. 
Panicum bulbosum var. minor Vasey. 
Panicum haliii Vasey. 
Panicum hirticaulum Presl. 
Papphorum wrightii Wats. 
Poa fendleriana (Steud.) Vasey. 
Sitanion elymoides Raf. 
Sporobolus confusus (Fourn.) Vasey. 
Stipa neomexicana (Thurb.) Scribn. 
CYPERACER: 
Carex sp. 
Carex sp. 
Cyperus fendlerianus Boeckl. 
Cyperus inflecus Muhl. 
Cyperus speciosus Vahl. 
Eleocharis montana (H. B. K.) R. & 8. 
Fimbrisiylis sp. 
Hemicarpha micrantha (Vahl) Britt. 
Stenophyllus capillaris (L.) Britt. 
COMMELINACE:: 
Commelina dianthifolia DC. 
Tradescantia scopulorum Rose. 
Tradescantia pinetorum Greene. 
