NO. 6 gentry: land plants 11 



EUPHORBIACEAE 

 Jatropha gossypiifolia L. 



Cubagua Island, April 14, Ehnore Q7 ; in grassland with coralline 

 boulders and clay. Flowers red. 



Distribution : Widely distributed in tropical America ; also in western 



Africa. 



CACTACEAE 

 Opuntia Tuna (L.) Mill van cubaguensis van nov. 



Articuli parvi, 6 — 13 cm longi, 5 — 9, cm lati, autem plerumque 9 — 10 

 cm longi et 7 — 9 cm lati, suborbiculati, tenues, pallidi-glaucescentes ; 

 areolae 2 — 3 cm distantes, orbiculares, prominentes, ad 4 — 5 mm elevatiae ; 

 aculei 2 — 4, ad 4 — 5 cm longi, grisei flavi; corollae lutea, emarginata, 

 apice mucronata. Specimen typicum Elmore Ql, Cubagua Island, Vene- 

 zuela, April 14, 1939, in Allan Hancock Foundation Herbarium. Dup- 

 lum in herbarium. University of Michigan. 



The variety differs from typical Opuntia Tuna in the smaller, thinner, 

 suborbicular joints, the longer porrect spines, and the emarginate prickle- 

 tipped petals. The collector reports it growing in clay soil in level dry 

 grassland. 



CONVOLVULACEAE 

 EVOLVULUS alsinoides L. 



Cubagua Island, April 15, Elmore Q9. 



Distribution : Widely distributed in tropics and subtropics of the Old 

 and New Worlds, usually in well aerated soils. 



BORAGINACEAE 



Heliotropium curassavicum L. 



Cubagua Island, April 15, Elmore Q13, sandy upper beach. 



Distribution : Widely distributed in tropical and subtropical America, 

 often in alkaline soils of the lowlands. 



TRINIDAD, BRITISH WEST INDIES 

 POLYPODIACEAE 



Adiantum bessoniae Jenm. 



Royal Botanic Gardens, Port of Spain, April 18, Elmore R16. 



Distribution : Trinidad. 

 Cyrtomium falcatum (L. F.) Presl. 



Royal Botanic Gardens, Port of Spain, April 18, Elmore R18. 



