110 



THE SALTON SEA. 



EUPHORBIACEjE— Continued. 



Chamaesyce cinerascens Small. Euphorbia cinerascens 

 Engelm. 



Sand wash near Figtree John Spring (8306). 



Not before reported from California. 



Founded by Engelmann on plants from northern Mexi- 

 co (Bot. Mex. Bound. Surv., vol. 2, pt. I, p. ISC), with 

 a variety apendiculata from San Felipe, the latter 

 reduced (Bot. Cal., vol. 2, p. 73) to a form of E. 

 polycarpa. 



Chamaesyce parishii Millsp. ined. Euphorbia parishii 



Greene. 

 Sand wash between Mecca and Red Canon (S113). 

 The type of this little-known species was collected at 



Daggett, in the Mojave Desert. 



Chamassyce polycarpa var. hirtella Millsp. ined. Euphor- 

 bia polycarpa Benth. var. hirtella Boiss. 



DosPalmas (8304), sand wash near Dixieland (8308), 

 Figtree John (8245), shores of Rabbit Bay (Mac- 

 Dougal), sands between Travertine Rock and the 

 adjacent mountains, abundant. 



Abundant northward in the Colorado Desert. 



Chamassyce saltonensis Millsp. ined. n. sp. 



Old beach-line near Calexico (8302), streets of Brawley 



(8305). 

 An endemic species of the Sink, known only from these 



collections. 



Chamaesyce setiloba Millsp. ined. Euphorbia scliloba 



Engelm. 

 In sandy or loose soil, in which it is often partly 



buried. Mounds at the old beach-line east of Holt- 



ville (8087), sand wash in the desert southwest of 



Brawley (8301). 

 A species of the southern parts of the Colorado Desert, 



the type collected at Fort Yuma. 



Chamaesyce serpens Millsp. ined. Euphorbia serpens H. 



B. K. 

 In hard detrital soil at Durmid (8066). 

 South to Mexico and east to Kansas and Illinois. Not 



before reported from California. 

 The above species of Chamaesyce were determined by 



Dr. Millspaugh. 



MALVACE.E. 



Malvastrum exile Gray. 



Plains northwest of Mecca (8447). 

 Common northward in the Colorado Desert and in 

 the Mojave Desert. 



Malva pabviflora Linn. 



Adventive in several of the towns of the Sink, but 



nowhere abundant. Mecca, Brawley, El Centro. 

 An abundant weed in California. 



Sida hederacea Torr. 



Frequent in extensive societies, in moderately dry 

 subalkaline soil, in the river bottoms of Imperial 

 Valley. New River at Rockwood (S316) and Calex- 

 ico. Also a troublesome weed in irrigated fields. 

 Rockwood, El Centro, Meloland, Seeley, Westmore- 

 land. 



An entrant from the delta, where it is common. 



Sphaeralcea orcuttii Vasey & Rose. 



Frequent in the arid alluvial soils of the southern and 

 eastern parts of the Sink. Desert between Brawley 

 and Salton Sea (8317), El Centro, Meloland (8097), 

 Holtville, Dixieland, Westmoreland, Calexico, Dur- 

 mid. 

 Suffrutescent; flowering at most seasons of the year. 

 An endemic species of the Sink. This and the 

 following Sphoeralceas were identified by Dr. 

 Robinson. 



MALVACE.®— Continued. 



Sphaeralcea emoryi Gray. (?) 



Along railway tracks at Indio (8321). 



Corollas lilac rather than brick-red, but otherwise 

 agreeing with the ordinary form of this species, 

 which is common in the Californian deserts. 



Sphaeralcea fendleri Gray. 



Streets at Mecca (831S, 8451). 



A species of western Texas, New Mexico, and Arizona. 

 Not heretofore detected in the Colorado Desert, but 

 occasional, in a varietal form, in cismontane south- 

 ern California. 



Sphaeralcea angustifolia Spach. var. cuspidata Gray. 

 A number of plants near Indio (8319). 

 This also is a plant of the same region as the last; not 

 detected heretofore in California. 



TAMARICACE.E. 



Tamarix pallasii Desv. 



A single shrub on the moist banks of Salton Sea at 

 Travertine Terraces (8512). 



Determined by Dr. Niedenzu. In full flower in Sep- 

 tember, and perhaps not identical with the shrub 

 flowering in early spring, cultivated in southern 

 California as T. yallica, an older name, according to 

 the Kew Index, for that here adopted, but recog- 

 nized as a distinct species by Niedenzu in Pflanzen- 

 familien vol. 2, tiel 6, p. 294, 1S95. 



LOASACE.E. 



Petalonyx thurberi Gray. 



Common in detrital soil throughout the Sink. Mecca, 



(8121), Caleb, Durmid, Figtree John. 

 A common species of the Colorado Desert. 



ONOGRACEjE. 



(Enothera trichocalyx Nutt. Anogra trichocalyx Small. 

 Desert between Brawley and Salton Sea (8320). 



(Enothera scapoidea Nutt. var. aurantiaca Wats. Chy- 

 lisma clava>formis Heller. 

 Obsidian Island (MacDougal 29), abundant on plains 

 northwest of Mecca (8445), and in sand at Traver- 

 tine Terraces. 

 The above (Enotheras are common plants of the Colo- 

 rado Desert. 



LYTHRACEjE. 



Lytiirum californicum T. & G. 



A single plant, at Figtree John Spring (SOU). 

 A common California species, not reaching the deserts, 

 and here a waif. 



CACTACE.E. 



Echinocactus cylindraceus Engelm. 



A single large specimen in a wash near Figtree John, 

 evidently carried down the wash when small, from 

 the adjacent mountains, where the species is fre- 

 quent. It does not properly belong to the flora of 

 the Sink. 



Opuntia echinocarpa Engelm. (?) 



A single plant in a wash near Mecca, without fruit or 

 flower. Like the previous species it was a migrant 

 from the adjacent mountains. 



ASCLEPIADACEiE. 



Asclepias subulata Decsne. 



A few plants in a wash near Agua Dulce at the south- 

 western end of the Sink. 



Frequent in the washes of the mountains which border 

 the Sink, here a migrant. 



