498 Britton: Studies of West Indian plants 



Leaves 1-1.5 cm. long, the lateral vena- 

 tion wholly obscure. 15. T. microphylla. 

 Leaves linear-oblanceolate or linear-oblong, 4-5 

 times as long as wide. 

 Capsule glabrous. 16. T. Leoni. 

 Capsule pubescent. 



Leaves strongly revolute-margined, abruptly 



mucronate. I7- T. revoluta. 



Leaves scarcely revolute-margined, acute or 



obtuse. 18. T. foliosa. 



I. Tricera Muelleriana (Urban) 



Buxus Muelleriana Urban, Symb. Ant. 5^ 400. 1908. 



Type locality: Cuba. 



Distribution: Known only from the type specimens (C. 

 Wright ig20). 



Referred by Grisebach to Tricera laevigata Sw., of Jamaica, 

 and by Mueller to Buxus subcohimnaris Muell. Arg. = Tricera 

 subcolumnaris (Muell. Arg.) Britton, of Martinique. 



2. Tricera marginalis sp. nov. 



A glabrous shrub about 3 m. high. Leaves broadly ovate to 

 ovate-lanceolate, subcoriaceous, 4-8 cm. long, 2-5 cm. wide, 

 reticulate-veined on both sides, with 2 distinct veins 1.5-3 mm. 

 from the margins, the midvein impressed above, prominent be- 

 neath, the apex acute, the base obtuse or subtruncate, the rather 

 slender petioles i cm. long or less; cymes several-flowered, longer 

 than the petioles, glabrous; bracts ovate-lanceolate, acute, 1.5 

 mm. long; pedicels of the staminate flowers about 4 mm. long, 

 the white calyx about 3 mm. long, its segments oblong, obtuse; 

 stamens about as long as the calyx, the filaments about twice as 

 long as the anthers; ovary ovoid; united styles somewhat longer 

 than the ovary; stigmas recurved, about one-third as long as the 

 styles. 



Alluvial valley of Rio Yamaniguey, Oriente {Shafer 4226) . 



3. Tricera cubana A. Rich, in Sagra, Hist. Cub. 11: 217. pi. 71. 



■ 1845 

 Buxus cubana Baill. Mon. Bux. 71. 1859. 

 Type locality: Monte Libau, Oriente. 

 Illustration: A. Rich. loc. cit. 

 Distribution: Known only from the type loeality. 



