CATALOGUE OP PLANTS COLLECTED IN SALTON SINK. 



105 



ZYGNEMACE.S. 

 Spirogyra sp. 



Sterile. In a ditch near Seeley (8203). Sterile 

 Spirogyras were also collected in the small streams 

 running from artesian wells at Mecca (S403a, 8401). 



Mougeotia sp. 



Sterile. In a ditch near Seeley (S203a). 

 The above Algae, except as noted, were determined 

 by Dr. W. A. Setchell. 



CHARACEiE. 

 Chara fragilis Desv. 



In the pool at Figtree John Spring (8614). 

 Determined by Dr. Hordsled. 



DERMATOCARPACEiE. 



Dermatocarpon rufescens (Asch.) A. Zahlb. 



A very few plants, in the shade of a rock, at base 

 of the mountains southwest of Travertine Rock 

 (8472). 



Determined by Dr. II. E. Hasse. 



A few sterile thalli of a second lichen were growing 

 with the above species (8472a), and in the corruga- 

 tions of Travertine Rock (8410). 



MUSCI. 



A small patch of a sterile moss was growing with the 

 Dermatocarpon above mentioned (8411). Another 

 sterile moss, apparently a different species, was 

 found on the wet mud banks of the small stream 

 flowing from the railway waterworks at Mecca 

 (8482). 



NAJADACE-iE. 



Ruppia maritima Linn. 



Filling the shallow current of Salt Creek near Seeley 

 (8223). 



GRAMINEiE. 



Holcus ualepensis Linn. Sorghum halcpense Pers. 



A single clump near El Centra. 



Introduced 2.5 years ago into soul hern California as 

 a valuable forage grass and now become a trouble- 

 some weed, but only adventive in the Sink. 



Pleuraphis rigida Thurb. 



Rabbit Bay (MacDougal 219). 



A common grass at higher altitudes in the desert; here 

 a migrant. 



Paspalum distichtjm Linn. 



Margins of canals, ditches, and reservoirs. Imperial 

 Valley, Meloland (8094), Rockw 1. 



A common weed in cismontane California, but prob- 

 ably entering here from the delta. 



Echinochloa colona Link. 



A very common weed in irrigated land throughout the 



Sink. Holtville (8085, S241), Mecca (8101), river 



bottom at Rockwell, Imperial, Brawley, El Centra, 



Thermal. 

 Very rare in cismontane California, and probably 



entering here from the delta. 



Echinochloa zelayensis Schult. 



Very common along the rivers and the irrigation canals 

 and ditches in Imperial Valley. Holtville (8085), 

 New River near Rockwood (8240), El Centra, 

 Meloland, Brawley, Mecca, a single clump along 

 the railway (SG18). 



The type was collected at Zelaya, in the State of 

 Queretaro, Mexico. It is the common Echinochloa of 

 Mexico, extending into western Texas and Arizona, 

 and now first reported from California. It occurs 

 in the Colorado River bottoms near Fort Yuma, 

 and is here an entrant from the delta. Readily 

 recognized in the field by its narrow panicle with 

 erect branches. Identified by Mrs. Agnes Chase. 



GRAMINE^E— Continued. 



Cbnchrds carolinianus Walt. 



Depauperate annual, 23 cm. high. Plains northeast 



of Mecca (8440). 

 An occasional weed in cismontane southern California. 



Setaria glauca Beauv. 



Widely introduced, but nowhere abundant, in the 



cultivated parts of the Sink. Streets of Brawley 



(8236), Mecca (8244), Thermal. 

 A widely distributed, but not abundant weed, in 



cismontane southern California. 



Aristida bromoides II. B. K. 



Occasional in dry soil. Indio (8237), near Dixieland 



(8239), base of the range of mountains west of 



Travertine Terraces (S434). 

 A widespread but not abundant grass of the Colorado 



Desert. 



Aristida californica Thurb. (?) 



In sand-pockets, Travertine Rock (8238). 



The spikelets had fallen, so that the identification i.s 

 not positive. In California the species is confined 

 to the eastern borders of the Colorado Desert, thence 

 eastward to Arizona and New Mexico. 



Sporobolus strictus Merr. 



Near Agua Dulce, at the northwestern end of Salton 



Sink (8242). 

 An Arizona species, now first detected in California. 

 This and the two preceding species were determined 



by Mrs. Agnes Chase. 



Sporobolus airoides Torr. 



A few large tussocks at Indio, and a siugle one between 



Calexico and Signal Mountain. 

 A species of wide distribution on the Pacific Slope, 



extending into Mexico. 



Avena fatua Linn. 



Brawley, in fields (8613). 



Very common and long established in most parts of 

 California, but rare in the Sink. 



PoLYPOGON MONSPELMENSIS Desf. 



Imperial Junction Beach (MacDougal 101a). Mecca. 



Not seen in Imperial Valley. 



A common weed of cultivation in California. 



Cynodon dactylon Pers. Bermuda grass. 



Very common in irrigated land-;, and about houses 

 throughout the Sink. Indio, Thermal, Mecca, Rock- 

 wood, Brawley, Imperial, El Centra, Calexico. 



Common throughout California except in the moun- 

 tains and deserts. 



Chloris elegans H. B. K. 



Common in cultivated lands and about streets 



throughout the Sink, always apparently introduced. 



Thermal (8247), Mecca. A reduced form 2 to 3 cm. 



high, plains northwest of Mecca (8441). Abundant 



at the Government Date Garden, Mecca (8100). 



Brawley, El Centra, Holtville. 

 Native of Texas and Mexico and an occasional waif 



in cismontane southern California. 



Bouteloua arenosa Vasey. 



Desert between Brawley and Salton Sea (8234), bluffs 



of New River near Rockwood (8235), Brawley and 



El Centra, about streets, Rabbit Bay (MacDougal 



221). 

 A species of northern Mexico, known in California 



only from the eastern borders of the Colorado Desert. 



Bouteloua barbata Lag. B. polyslachya Benth. 



In dry soil near Mecca (8102), Town Park, Holtville 



(8125). 

 In California known only from eastern part of the 



Colorado Desert, passing east and south to Mexico. 



