4o6 Field Museum of Natural History — Botany, Vol. II 



glabrous, strongly tricoccous, the carpels rounded-keeled and minutely 

 white-punctate; seeds white, .gx .5 mm., elongated ovoid-quandrangular, 

 angles rounded, the dorsal prominent; facets marked medially with two 

 longitudinal lines of short, rounded, inconspicuous, irregular, transverse 

 rugae. 



Near Ch. sulfurea from which its seed readily differentiate it. 



Type locality Lee Canyon, Charleston Moimtains, in limestone at 

 8000 ft. alt., Clark Co., Nevada, A. A. Heller 11058 (Type in herb. 

 Field Musetmi cat. no. 411,087); previously gathered by Leslie N. 

 Goodding, in sandy washes at Las Vegas, Nevada, in 1907, No. 2282. 



Chamaesyce aureola sp. no v. 



An erect, or prostrate, pilose annual (?) with a ligneous root from 

 which spreads a dense mass of terete, divaricate branches and branchlets. 

 Inflorescence solitary, terminal and upperaxillary. Leaves thick, 

 strongly inaequilateral, ovate, obtuse, 2-4 x 1.5-2 mm., densely pilose, 

 cordate, entire; petioles less than one-half the length of the blade; 

 stipules: the lower deltoid, the upper filiform, those of the upper surface 

 with a flat, purplish gland at the base. Involucres turbinate, the throat 

 densely pilose; peduncle about one-half the length of the tube; tube 

 densely pilose without and within; lobes deltoid, pilose; sulcus V-shaped; 

 glands transverse, oblong, reddish-brown, fiat and but little cupped; 

 appendages large, white or creamy, ovate, nearly entire; bracteoles 

 many, ligulate, glabrous; stamens few, filaments glabrous, the joint 

 close to the anther base; female pedicel thick, pilose; ovary pilose; 

 styles 3, bifurcate to the middle, the branches divaricate and not sensibly 

 enlarged at their stigmatic apices. Capsule strongly tricoccous, densely 

 pilose; seeds smooth, white, creamy- white or sage-color, elongate-ovate, 

 1.2 X .6 mm., the dorsal angle prominent, 4-angled at the base, pointed 

 at the apex, the facets smooth and showing but a few slight indications of 

 scattered pits. 



Near Ch. polycarpa and Ch. vestita from each of which the characters 

 readily distinguish it. 



So far seen only in a series of specimens collected at Azusa, Los 

 Angeles Co., California, at an elevation of 800 ft. Huron H. Smith 4933 

 (Type in herb. Field Museimi cat. no. 389,282). 



Chamaesyce prostrata (Ait.) Small Fl. SE. U. S. 713, 1333. 1903. 



A species of wide distribution misinterpreted in previous Yucatan 

 publications of species as E. rhytisperma and serpyllifolia on account of 

 variation from the type form. 



The species is represented in the Yucatan Flora by Schoti g6ya from 

 Merida where it was gathered in a mass of Ch. hirta; Millspaugh 27 



