Britton: Studies of West Indian plants 13 



54. THE GENUS LEUCOCROTON Griseb. 



A Cuban genus, of which four species have been described. 

 L. Wrightii Griseb. is the type species. 



A. Leaves pinnately veined. 

 Leaves chartaceous. 



Pistillate inflorescence i-flowered at the summit; stami- 



nate flowers racemose. i. L. Wrightii. 



Pistillate flowers racemose, the staminate glomerate- 



spicate. 2. L.Jlavicans. 



Leaves coriaceous, linear-oblong or linear. 

 Leaves densely whitish-scurfy beneath. 



Leaves strongly revolute-margined, not reticulate- 

 veined beneath, coarsely reticulate-veined above. 3. L revolulus. 

 Leaves slightly revolute-margined, strongly reticulate- 

 veined beneath, finely reticulate-veined above. 4. L. saxicola. 

 Leaves glabrous on both sides. 



Leaves mostly rounded and mucronulate at the apex, 



dull. 6-10 mm. wide. S- ^« anguslifolius. 



Leaves emarginate, shining, 3-5 mm. wide. 6. L. linear if olius. 



B. Leaves palmately 5-veined. ?• L. virens. 



1. Leucocroton Wrightii Griseb. Abh. Kon. Gesell. Wiss. 



Getting. 9: 21. i860 



Woodlands and banks of streams, Oriente; Pinar del Rio. 



2. Leucocroton flavicans Muell. Arg. in DC. Prodr. 15^: 757. 



1866 



L. flavicans latif olius Muell. Arg. loc. cit. 1866. 

 L. flavicans angustifoliiis Muell. Arg. loc. cit. 1866. 



Serpentine hillsides, Matanzas, Havana. The locality of C. 

 Wright's no. 1994 is not recorded. 



3. Leucocroton revolutus Wright; Sauvalle, Anales Acad. 



Habana 7: 154. 1870 



Known only from the type locality between La Mulata and 

 La Palme, Pinar del Rio. 



4. Leucocroton saxicola sp. nov. 



A shrub, 1-33 m. high, much branched, the twigs short and 

 stout. Leaves coriaceous or subcoriaceous, narrowly oblong or 

 oblanceolate, 3-1 1 cm. long, 2 cm. wide or less, rounded or emar- 

 ginate and apiculate at the apex, narrowed at the base, finely 



