186 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 13 



This collection may be referable to C. apiculata Piper (C.N.H. 20: 

 566. 1925), but the leaves are broadly ovate and retuse, not acute, which 

 latter character Piper used to separate his northwest Mexican maritime 

 species. He does not cite C. maritima from the Mexican west coast, 

 hence Elmore's Oaxaca collection with the characters of C. maritima 

 makes Piper's C. apiculata a dubious species, since the small differences 

 apparently are not correlated with geographic segregation. 



Desmodium scorpiurus (Sw.) Desv., Jour, de Bot. 1:122. 1813. 



Chacagua Bay, Oaxaca, March 21, Elmore D9, on dry, shaded, 

 sandy soil under cocoanut trees. 



Littoral from central Sinaloa south through Central America. A 

 procumbent herb characteristic of the sandy littoral. 



Phaseolus adenanthus Me^^er, Prim. Fl. Esseq. 239. 1818. 



Chacagua Bay, Oaxaca, March 21, Elmore D2, growing on and 

 among sand dunes on the upper beach. 



Widely distributed through lowlands of tropical America. 



A glabrous or puberulent vine with lanceolate leaflets, very unequal 

 calyx lobes (upper broad and rounded, lower lanceolate, acute), bracts 

 strongly 9-10-nerved, pale flowers, and rather straight pods 7-8 x 100 

 mm. 



Prosopis aff. juliflora (Sw.) DC, Prodr. 2:447. 1825. 

 Tenacatita Bay, Jalisco, May 8, Elmore 1A24. 

 This form of the species is common along the west coast of Mexico 

 from Sinaloa south, chiefly below 2000 feet elevation. 



EUPHORBIACEAE 



Euphorbia hirta typica Wh., Cont. Gray Herb. 127:68. 1939. 

 Tenacatita Bay, Jalisco, May 8, Elmore 1A13, dry clay soil in forest 

 clearing. 



Widely dispersed through tropical and subtropical America. 



HippoMANE Mancinella L., Sp. PI. 1191. 1753. 



Tenacatita Bay, Jalisco, May 8, Elmore 1A18, in dry open forest. 



From southern Mexico south through Central America to South 

 America and the West Indies. 



Sapindaceae 



Paullinia fuscescens HBK., Nov. Gen. & Sp. 5:93. 1821. 



Chacagua Bay, Oaxaca, March 21, Elmore D5, growing as a vine 

 over a tree in sandy soil in dry forest at 10 feet elevation. 



