Britton: Studies of West Indian plants 457 



Chamaesyce Cowellii Millspaugh, sp. nov. 



A small, prostrate, glabrous annual, many-stemmed from the 

 rootstalk; stems short; branches filiform, 2-3 cm. long; nodes 

 swollen and prominent. Inflorescence solitary in the upper axils. 

 Leaves thick, sarcous, ovate, entire, blunt, 2-3.5X1.5-2 mm., 

 strongly inequilateral at the oblique and but slightly cordate 

 base, petiolate; stipules various, those of the upper surface mostly 

 quadrilateral and often bilobed, others triangular, all lacerate; 

 those of the under surface of the branches formless in laceration. 

 Involucres turbinate, short-pedunculate, glabrous without, densely 

 woolly within; lobes triangular, aristate, densely ciliate; sulcus 

 shallow, inconspicuous, flanked by two minute lobes similar in 

 form to the others; glands green, flattened parallel to the walls of 

 the involucre; appendages narrow, greenish, crenate, about half 

 the width of the glands. Capsule glabrous, deeply sulcate; seeds 

 pink, ovate-quadrangular, the dorsal angle most prominent, 

 1X0.6 mm., the facets finely and anastomosely transverse-ridged 

 in a central longitudinal line. Allied to Chamaesyce serpens 

 (HBK.) Small. 



Collected from the crevices of limestone rocks at Cayo Muertos 

 {Britton, Cowell & Brown 5007). Type, sheet No. 427101, in 

 the herbarium of the Field Columbian Museum. 



Sebesten brachycalyx (Urban) 

 Cordia Sebestena brachycalyx Urban, Symb. Ant. 1: 389. 1899. 

 This tree, first made known from the southern and eastern 

 coasts of Porto Rico, appears to differ specifically from the related 

 Sebesten Sebestena (L.) Britton {Cordia Sebestena L.) of wide dis- 

 tribution in the West Indies, Florida and tropical continental 

 America, and there much planted for ornament. S. brachycalyx 

 has much rougher upper leaf-surfaces and a much smoother calyx 

 than S. Sebestena (often glabrous), and its yellow or orange fruit 

 is shorter-beaked than the white fruit of that species; the corolla of 

 S. brachycalyx has a narrower limb than that of S. Sebestena. The 

 species inhabits Porto Rico, Vieques, Culebra, and Buck Island, 

 St. Thomas. 



Crescentia portoricensis sp. nov. 



A vine-like, glabrous shrub, with long, slender branches, the 

 bark light gray. Leaves elliptic-obovate, fascicled at the nodes, 

 15 cm. long or less, 2-8 cm. wide, coriaceous, shining above, dull 

 beneath, strongly reticulate-veined on both sides, abruptly short- 



