118 



BULLETIiSf 56, UNITED STATES NATIONAL MUSEUM. 



and there are many pitayas on the rocky hills. The choya forms 

 groves, in which the largest plants are sometimes from 2 to 4 meters 

 in height, and gaunt at that season (January and February) from the 

 annual shedding of their joints. The sandy arroyos contain patches 

 of Parosela spinosa, and are bordered by ironwood, large and small- 

 leaved palo verde and mesquite trees. 



The settlement consisted of three adobe dwellings, a warehouse, 

 and a corral at the springs, and a small house at the garden. From 

 Quitobaquita Springs several streams flow into a shallow, artificial 

 lake, the overflow from which is conducted by an acequia to an 

 extensive field of wheat and Avhite clover, bordered by fig trees and 

 surrounded by a brush fence. This proved to be an excellent col- 

 lecting ground for birds and mammals. A few ducks and waders 

 and one pair each of the white-bellied swallow, black pha'be, and 

 vermilion flycatcher frequented the lake. Dipsosaurus dorsalis and 

 Uta danshuriana were common lizards. A toad' {Bufo alvarius 

 Girard) was also taken. 



This station was occupied by the writer and Mr. Holzner from 

 January 25 to February 8, 1894. 



^lora of Sonoyta Valley (Monuments Nos. 104 to 174). — Trees: 



SaVix nigra Marshall. 

 PopuJuJi frctnoiitii Watson. 

 Acacia (irccKjil Gray. 

 Prosoi)is odorata Torrey and Fremont. 

 Prosopis f'ldiululosa Torrey. 

 Parkinson ia aciileata LinniBUs. 

 Parkinsonia micropliylla Torrey. 

 Cercidiiim torrci/aninn (Watson) Sar- 



Paroscla sjnnosa (Gray) Heller. 

 Olncya tcsota Gray. 

 Cerciis f/it/antciis Engelniann. 

 Ccrciis tluirhcri Engelmann. 

 Opuntia fulgida Engelniann. 

 Opiintia versicolor Engelmann. 

 Opuntia spinosior (Engelmann) 



Tourney. 

 Savihucus glaiica Ni!ttall. 



gent. 



Zi.zyphus ohtusifolia Gray. — This species (specimen No. 2739, 

 orig. 198) becomes a small tree, having a trunk from 1 to 4 deci- 

 meters in diameter and a height of 3 to G meters, and with branches 

 all armed with very long spines. It usually branches from the 

 ground, around the main trunks, spreading so as to form an impene- 

 trable growth. It is common in valleys. 



Conspicuous plants, other than trees, are : 



Scirpus olneyi Gray. 



Scirpiis occidentalis (Watson) Chase. 



Fouquieria spletulens Engelmann. 



CoriUca tridentata (de Candolle) 

 Vail.a 



Euphorbia viiscra Gray. 



Ecliinocactus icislizeni Engelmann. 



Echinocactu-s tvislizeni lecontei Engel- 

 mann. 



Datura mctcloides de Candolle. 



Anemopsis calif or nica (Nuttall) 

 Hooker and Arnott. 



Aster spinosus Bentham. 



Baccharis emoryi Gray. 



Baccharis glutinosa Persoon. (Mexi- 

 can name, "batamote.") 



Plucliea sericca (Nuttall). (Mexican 

 name, " cochinilla.") 



1 The creosote bush is called by the Mexicans " gobernadora " or " hediondilla," 

 and is much used as a remedy for rheumatism in man and (asthma?) in horses. 



