140 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 13 



ing, prostrate herb. Since the inflorescence of the Rempel collection has 

 been modified by galls, Wheeler has questionably referred the collection 

 to this species. 



Euphorbia tomentulosa Wats., Proc. Am. Acad. Sci. 22:476. 

 1887. 



Near Guaymas, Sonora, February 9, Dawson 1080. San Carlos Bay, 

 February 8, Dawson 1057. 



Common on coarse rocky dry soils nearly throughout the gulf region 

 as far south as southern Sonora and the Cape District. It is a low suf- 

 frutescent, bushy, flat-topped herb. 



Euphorbia Xantii Engelm. in Boiss., DC, Prodr. 152:62. 1862. 



Puerto Escondido, February 11, Dawson 1092, 1099. Canyon above 

 Puerto Escondido, March 13, Rempel 149. 



Southern Baja California and northern coastal Sinaloa; type from 

 Cape San Lucas. It forms a slender, erect, flat-crowned shrub 1 to 2 m 

 tall with dichotomous virgate branching; the leaves are ephemeral fol- 

 lowing the summer rains. The plant may bloom in a leafless condition 

 in the spring. It has the largest flowers, 6 to 9 m in diameter, of any of 

 the gulf region euphorbs and is attractive in bloom. It was cultivated 

 successfully in the greenhouse of the Carnegie Desert Laboratory in 

 Tucson for many years. 



Jatropha cinerea (Ort.) Lluell. Arg. in DC, Prodr. 152:1078. 

 1866. 



Questionably referred here is Rempel 119 from Agua Verde Bay 

 collected March 10, 1937. The specimen consists of a sterile and what 

 was once a turgescent shoot, bearing large cordate, ternately lobed, long- 

 petiolate leaves, 9 to 14 cm broad, the emarginate sinuses very narrow 

 and deep. Other collections seen have been referred to either this species 

 or to /. canescens of Bentham, but neither name seems satisfactorily ap- 

 plicable. Flower and fruiting material are needed for taxonomic place- 

 ment of the plant. It occurs in the deep can3^ons of the Sierra Giganta. 



Jatropha cuneata Wiggins & Rollins ?, Cont. Dud. Herb. 3 :272. 

 1943. 



San Gabriel Bay, Espiritu Santo Island, March 7, Rempel 92, small 

 thick-trunked tree throughout pass except on alkali. 



The succulent v/oody branches with numerous short spur-branchlets 

 of the sterile Rempel collection are doubtfully referred here. The species 

 is widely distributed in the California Gulf Region; tj^pe from near 

 Kino Bay, Sonora. 



