Britton: Studies of West Indian plants 467 



Rondeletia calcicola sp. nov. 



A glabrous shrub about 2 m. high, the twigs slender. Leaves 

 coriaceous, narrowly oblong to oblong-oblanceolate, 5-13 cm. 

 long, 8-18 mm. wide, shining above, dull beneath, acute at the 

 apex, attenuate at the base into petioles about 1 cm. long or less, 

 loosely reticulate- veined with the mid vein prominent on the under 

 surface; inflorescence terminal, few-flowered; fruiting pedicels 

 rather stout, 3-7 mm. long; capsule oblong or oblong-obovoid, 

 glabrous, 1 cm. long, about twice as long as thick; fruiting calyx- 

 lobes ovate-lanceolate, acute, 1-1.5 mm. long. 



Wooded limestone plain, Coe's Camp, Ensenada de Siguanea 

 {Britton & Wilson 14842). 



Diodia ciliata Britton & Wilson, sp. nov. 



Stems perennial, prostrate, 4-6 dm. or more in length, rooting 

 and partly buried in sand, densely pilose with whitish hairs on the 

 younger growth; leaves elliptic to somewhat elliptic-obovate, 1.5-3 

 cm. long, 7-14 mm. broad, acute at the apex, cuneate to broadly 

 cuneate at the base, the margin conspicuously and densely ciliate 

 with rather stiff white hairs, yellowish green and glabrous above, 

 the midvein and lateral veins inconspicuous, whitish-pilose beneath, 

 especially on the midvein, sessile; stipules ciliate; ovary 2-celled; 

 fruit elliptic-obovoid, 3 mm. high, glabrous, or with few scattered 

 appressed hairs on the back. 



In white sand, vicinity of Los Indios (Britton & Wilson 15347). 



Diodia arenicola Britton & Wilson, sp. nov. 



Perennial; stems ascending, 1-1.5 dm. high, glabrous; leaves 

 lanceolate, 6-14 mm. long, 2-3 mm. broad, acute at the apex, 

 rounded or somewhat acutish at the base, glabrous or with few, 

 stout, scattered, mostly appressed hairs above, glabrous beneath, 

 sessile; stipules linear-lanceolate, 2 mm. long; calyx lobes triangular- 

 ovate, ciliate; corolla 5 mm. high, the lobes ovate, obtuse; anthers 

 ovate-lanceolate; style 3-lobed; fruit ellipsoid, 2.5 mm. high, 1.2 

 mm. broad, glabrous. 



Along arroyo, Los Indios, Isle of Pines (0. E. Jennings 355 in 



part, type); vicinity of Los Indios (Britton & Wilson 15812). 



Mitracarpum depauperatum Britton & Wilson, sp. nov. 



A diminutive, woody perennial, 2-5 cm. high, forming small 

 tufts, the stems few-branched or simple, the internodes very short. 

 Leaves narrowly linear, 6-15 mm. long, less than 1 mm. wide, 



