April, 1916. Euphorbiace^ — Millspaugh 407 



(1887), also from Merida; Gaumer 254 from cultivated ground at Izamal, 

 460 from stone walls at the same place, and on waste ground at Tekax, 

 1123, 



Chamaesyce rutilis Millsp. Field Mus. Bot. 2:385. 1914- 



This species of Guatemala and Honduras has turned up in the 



Yucatan region. The type is Chas. C. Deam, 6i8g, Field Mus. cat. no. 



285,111 from Fiscal, Guatemala, alt. 3700 ft. 



The Yucatan localities are: Chaltumha Road, Sitilpech Road, 



Gaumer pjS, gjg. 



Chamaesyce vilHfera (Scheele) Small Fl. SE. U. S. 712, 1333. 1903. 



The previously known range of this striking species, Texas to Orizaba, 

 Mexico, is extended farther south by a number of specimens collected 

 by Dr. Gaumer at Buena Vista Xbac and Chichankanab, Yucatan, 1103, 

 1 186, 222g. 



Chamaesyce jmcatanensis sp. nov. 



Rosulate-prostrate from a slender annual root; stem and branches 

 filiform, pilose. Inflorescence solitary in the axils of the upper leaves. 

 Leaves inaequilateral, 5-7 x 2-4 mm., oblong-lanceolate, strongly obli- 

 que at the base, acute, the margin distantly serrate; petioles about imm. 

 long; stipules represented below by a somewhat denser mass of the stem 

 hairs, above by a scale-like, waxy gland at the base of the petiole. In- 

 volucres tubular-campanidate, sessile or apparently so, pilose without 

 glabrous within; lobes represented by clusters of hairs except where 

 flanking the deep, round-based sulcus where they are triangular, acute; 

 glands bright-green, scutelliform, appendages white, unequal, about 

 twice the size of the glands, ovate, unequally crenate-margined; brac- 

 teoles none; male pedicels 3-5; female pedicel about the length of the 

 ovary; styles 3, bifurcate at the upper third; ovary pilose. Capsule 

 pilose, ovoid, deeply sulcate; seed pinkish-ashen, .8x .5 mm., sharply 

 angled, the facets marked by irregular and broken transverse ridges. 



Near Ch. cozumelensis. 



Progreso, Yucatan, on the rocky plain south of the lagoon, Mills- 

 paugh i6g6, March 5, 1899. Type in herb Field Mus. cat. no. 61,696. 

 Erroneously referred to Ch. Karwinskyi (Boiss.) {E. Karwinskyi Boiss.) 

 in Field Mus. Bot. 2 :65. 



The other North American species of this genus not previously trans- 

 ferred to it are : 



Chamaesyce acuta (Engelm) 



Euphorbia acuta Engelm. Mex. Bound. 189. 



