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, 2-3.5X1I.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. 5. 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- 
