4 ALLAN HANCOCK ATLANTIC EXPEDITION REPORT 



S. F. Blake National Arboretum Compositae 



E. U. Clover University of Michigan Cactaceae 



L. Croizat Arnold Arboretum Euphorbiaceae 



L. H. Harvey Montana State University Gramineae 



I.M.Johnston Arnold Arboretum Boraginaceae, Hydrophyllaceae 



E. C. Leonard National Arboretum Acanthaceae 



C. V. Morton National Herbarium Pteridophytes 



H. O'Neill Catholic University Cyperaceae 



C. Schweinfurth Botanical Museum of Hai^vard Orchidaceae 



P. C. Standley Chicago Museum Miscellaneous 



L. C. Wheeler Univ. So. Calif. Euphorbiaceae 



I. L. Wiggins Stanford University Malvaceae 



Without the responsive help of those listed above, the writer could 

 not pretend to handle adequately the elements of a flora with which he has 

 only a nodding acquaintance. To Captain Hancock goes the writer's 

 special appreciation for the opportunity to study the Allan Hancock 

 Foundation collections. 



ARUBA ISLAND, NETHERLANDS WEST INDIES 



AIZOACEAE 



Sesuvium portulacastrum L. 



Vicinity of San Nicolaas, April 9, Elmore N5, in blackish marsh of 

 upper beach. 



Distribution: Littoral of tropical America. 



EUPHORBIACEAE 



Cnidosculus urens (L.) Arthur vel afif. 



Vicinity of San Nicolaas, April 8-9, Elmore N2; with white flowers, 

 in semi-desert among rocks. 



Distribution: Widely distributed in the American tropics. 



The collection is atypical in the woody nature of the main branches 

 and the extremely dense spinescence. McVaugh, who named the specimen 

 and who is giving the genus careful study, states that the complex of 

 C. urens is in need of intense study, the specific and varietal limits not yet 

 having been well defined. 

 Euphorbia buxifolia Lam. 



Vicinity of San Nicolaas, April 8-9, Elmore N8. 



Distribution : West Indies. 

 Jatropha gossypiifolia L. 



