VEGETATION OF DEATH VALLEY. 



31 



^MT)f the species common to the Sierra Nevada, Cascade Mountains, and 

 ^pliocky Mountains, nearly one-half are also either Alaskan or circuin- 

 W polar; while the number of those common to the three ranges and con- 

 | fined within them is less than the number confined to the Sierra Nevada 

 alone. 



GEOGRAPHIC RELATIONSHIP OF THE FLORA OF DEATH VALLEY. 



The flora of Death Valley itself is wholly different from that of the high 

 Sierra Nevada, in both its systematic and its geographic relationship. 

 A list of the species actually collected there is given below. Little 

 comment in addition to that given in other parts of the report is 

 necessary. The explanation of the relative abundance of the various 

 groups of plants into which the list is divided, and of the adaptations 

 of these various types to their environment, is the same as that of the 

 desert vegetation in general, and may be consulted on pages 42 to 55. 



The geographic relationship of the Death Valley flora is clear, with- 

 out a tabulation of the distribution of its various species. The arid 

 plants of the valley, almost without exception, are species which extend 

 far southward into Mexico through the States of Sonora and Chi- 

 huahua, and which are there confined to the arid interior plateau of 

 that country. 



LIST OF PLANTS FOUND IN DEATH VALLEY. 



I. PLANTS GROWING IN MOIST SOIL. 





(a) Trees. 



Prosopis jitliflora. 



Allenrolfca occidentalis. 

 Atriplex lentiformis. 

 Atriplex parryi. 



Afjrostis verticillata. 

 Andropogon macrourus. 

 Anemopsis calif'trnica. 

 Apocynum cannabinum. 

 Chara foetida, 

 Cladium mariscus. 

 Dislichlis spicata. 

 Eleocharis rostellata. 

 Elymua triticoides. 

 Epipactis gigantea. 

 Fimbristylis thermalis, 

 Imperata hookeri. 

 Juncus balticus. 

 Juncus cooperi. 

 Ly thrum album. 

 Nitrophila occidentalis. 



Prosopis pubesccns. 



(b) Slirube. 



Paccharis sergilioides. 

 Pluchea sericea. 

 Salix longifolia. 



(c) Perennials. 



Panicum crusgalli. 

 Phragmitcs vulgaris. 

 Puppia maritima. 

 Schmnus nigricans. 

 Scirpus amcricanus. 

 Scirpus lacustris occidentalis. 

 Scirpus maritimus. 

 Scirpus olneyi. 

 Sisyrinchium helium. 

 Solidago spectabilis. 

 Sorgh u m ha lepen se. 

 Sporobolus airoides. 

 Sporobolus aspcrifolius. 

 Sporobolus depauperatus, 

 Succda suffruteseens. 

 Typha anguslifoliat 



