170 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 13 



MiTRACARPUs PORTORICENSIS Urb., Symb. Antill. 4:609. 1911. 



Doubtfully referred to this Caribbean species is Dawson 1184 from 

 San Jose del Cabo, Februar}^ 17 (flowering). Standley, who determined 

 the collection, reported that he had not been able to place the specimen 

 satisfactorily. 



CUCURBITACEAE 



CucuMis DIPSACEUS Ehrenb. in Sprach, Hist. Veg. Phan. 6:211. 

 1838. 



San Jose del Cabo, February 17, Dawson 1194. 



Apparently originally from the north African highlands, it is now 

 widely but discontinuously dispersed in both the Old and New Worlds. 

 In North America it has been collected from such widely separated 

 regions as Oregon, Baja California, and the West Indies. 



EcHiNOPEPON MINIMUS (Kell.) Wats., Proc. A.m. Acad. Sci. 24: 

 52. 1889. 



Marah mini?na Kell., Proc. Calif. Acad. Sci. 2:18. 



Canyon above Puerto Escondido, Sierra Giganta, ]\larch 13, Rempel 

 752; April 20-22, 1938, Gentry 3747 (fruiting). 



Rather widely scattered in central and southern Baja California and 

 the adjacent islands on the outer coast; type from Cedros Island. Appar- 

 ently annual, it has very slender and rather short stems, about the 

 smallest of the cucurbit vines in the region, with densely echinate fruits, 

 dehiscing irregularlj'^, the prickles rather short and somewhat flattened. 



Echinopepon peninsularis Gentry sp. nov. 



Herba annua; caulis ramique graciles, striati, ad nodos pilis longis 

 albis praediti; petioli 2-3 cm iongi; folia membranacea, 4-6 cm longa, 

 6-8 cm lata, lobis 5, late lanceolatis, serrulatis, aristatis, sparse scabro- 

 pubescentibus ; cirrhi graciles 1-2-fidi; <S pedunculi glabri, 10-15 mm 

 Iongi ; pedecelli glandulo-hispidi ; corolla 12-15 mm lata, segmentis ovatis, 

 ciliolatis; $ pedunculi 5-8 cm Iongi; corolla ca. 10 mm lata; fructus 

 solitarius, 2 cm longus, sparse glandulo-pubescens, echinatus; aculei 8- 

 12 mm Iongi. 



Typus: Dawson 1193, "San Jose del Cabo, Cape District, Baja 

 California, Mexico, February 17, 1940," in hb. Allan Hancock Founda- 

 tion, University of Southern California. Duplum in hb. Univ. Mich. 



Annual scandent herb; stems 1-2 m long, slender, sulcate, glabrous 

 except for rings of white hyaline hairs 4-6 mm long at the nodes; pet- 

 ioles 2-3 cm long, slender, glabrous; leaf blades 4-6 cm long, 6-8 cm 

 wide, deeply 5-lobed nearly to the base, rarely 7-lobed, the lobes mostly 



