SEPT., 1914. EUPHORBIACE.E MILLSPAUGH 391 



Chamaesyce densiflora (Klotzsch) comb. nov. 



Euphorbia densiflora Klotzsch obs. in Peters Nat. Reise Mossamb. 

 Bot. 94. 1862. 



Anisophyllum densiflorum Kl. & Gke. Tricocc. 28. 1859. 



Euphorbia adenoptera Boiss. D. C. Prodr. 15:49. 1860. non Bertol. 



Plants prostrate, spreading from a woody base; root rather thick, 

 ligneous; rootstalk nodose; stems many, compressed, simple or branch- 

 ing; branches divaricate, pilose on both surfaces but shorter on the 

 ridged upper side, densely leafy brae ted on the branchlets. Inflorescence 

 axillary, glomerately crowded in ranks at the ends of the branches and 

 along the leafy branchlets. Leaves oblong to ovate-oblong, 1-1.5 x -5~ 

 i cm., more or less falcate, finely and shortly crispid-pilose on both sur- 

 faces, the old ones sometimes glabrous above, strongly unequal, the base 

 auriculo-cordate, the apex rounded or sub-truncate, margin finely 

 denticulate especially toward the apex; petioles very short, one-tenth the 

 length of the blade, villous or glabrate; stipules subulate-aristate, always 

 recurved, often unequally bifid at the base, slightly and minutely pilose. 

 Involucres campanulate, outer surface pilose; lobes broad fimbriate, 

 ciliate; glands large, plane, not cupped, somewhat smaller than the 

 appendages, the larger pair reniform, the smaller oval; appendages 

 white, pilose often on both surfaces, the hairs longest on the under, outer 

 margin erose-dentate; pedicels of the male flowers glabrous, of the 

 female pilose above, male flowers frequently all aborted in those invo- 

 lucres bearing female flowers and vice versa; ovary densely pilose; style 

 tripartite two-thirds the branches bifid half their length. Capsule 

 densely short-pilose even in age; seed ovoid, slightly quadrangular, 

 .85 x .60 mm., pinkish, obtuse; facets convex; ridges broad, the lower 

 pair generally more or less anastomosing; sulci 6, narrowed to mere deep 

 lines; seed-coat minutely pitted. 

 Type locality: MEXICO, Papantla Schiede. Type in herb. Berlin. 



(A sheet in herb. Kew bears a branch of the type plant and the 



Skinner specimen from Guatemala, both determined, in Klotzsch's 



handwriting, Euphorbia densiflora.} 

 Distribution: CANAL ZONE, Pittier 2848 (hb. Berlin). 



NICARAGUA, in Monte Masaya; in Monte Candelaria; in Monte 



El Viejo and in San Jose, Oersted (hb. Berlin). 



COSTA RICA, San Francisco de Guadalupe, Tonduz 7245 (F. 



413500; U. S. 471734); Canas Gordas, Pittier 11083 (F. 413499; 



U. S. 392010); in Monte Irasu, Oersted (hb. Berlin). 



GUATEMALA, Skinner (hb. Kew); Santa Rosa, Jumaytepec, 



Heyde & Lux 4569 (F. 264921); Baja Verapaz, San Augustine, 



