126 SYNOPSIS OF THE FLORA OF COLORADO. 



Denver, Dr. Smith; B. H. Smith. Plains of the Platte, Coulter. Very 

 abundant on the plains around Colorado Springs, Porter. 



EUPHORBIA OBTUSATA, Pursh. Canon City, Brandegee. 



EUPHORBIA DICTYOSPERMA, Fisch. & Meyer. Hall & Harbour, 510. 

 Eastern Colorado, Porter. 



EUPHORBIA MONTANA, Engelrn. DC. Prod., 15, 2d pt.. p. 148. Perenni- 

 al, very glabrous, glaucous; stems many from a thick root- stock, ascending, 

 leafy, shortly branched from the upper axils or often simple, 8'-15' high ; 

 leaves scattered, rather thick, subsessile, entire, rounded at base, 4"-15" 

 long, ovate, obtuse, the uppermost subverticillate ; floral bracts orbiculate, 

 triangular, rarely subcordate, very obtuse, mucrouulate, broader than 

 long; inflorescence umbellate, the rays becoming repeatedly dichoto- 

 mous; involucre turbiuate, roughish within, the lobes oblong-linear, 

 velvety; glands transversely oblong, truncate, very shortly 2-horned; 

 styles very short, bifid, thickened at the apex ; capsule 2" long, ovate, 

 smooth; seeds oblong, superficially pitted, caruncle shortly conical. Hall 

 & Harbour, 509; Parry, 438. Near Denver, Dr. Smith; B. H. Smith; 

 Canby; Meehan. Cation City, Brandegee. Colorado Springs, Porter. 

 Boulder Canon, Clear Creek Canon, and plains of the Platte, Coulter. 



TRAGIA NEPET^EFOLIA, Miiller. DC. Prod., 15, 2d pt., p. 933. Low, erect 

 or ascending; petioles 4-10 times shorter than the blade; blade lobate-den- 

 tate below, otherwise coarsely dentate; racemes short; bracts lanceolate ; 

 divisions of the pistillate calyx ovate or lanceolate; anthers oblong; fila- 

 ments not thickened at the summit; ovary strigose-hirsute; styles con- 

 nate about one-third their length, rather shortish, erect-spreading, sub- 

 acuminate. 



Yar. RAMOSA, Miiller. DC., I. c., 934. (T. ramosa, Torr., in Ann. F. Y. 

 Lye. 2, p. 245.) Hirsute, erect, much branched, 6'-8' high; stem slender, 

 at length nagelliforni-elon gated, weak and somewhat twining; leaves 

 triangular-ovate from a cordate base or oftener lanceolate, gradually ac- 

 curninate, 8"-12" long. Hall & Harbour, 309. Canon City, Brandeyee ; 

 Redjield; Greene. 



CROTON (HENDECANDRA) TEXENSIS, Miiller. DC. Prod., 15, 2d pt., p. 

 692 ( C. muricatus, Eutt.) Covered with a close, canescent, stellate pubes- 

 cence, dichotomously branched and spreading, l-2 high; leaves peti- 

 oled, lance-ovate, oblong or linear-lanceolate, obtuse or acute, I'-l-J' 

 long, entire or repand ; dioecious, racemes of male flowers short, pedun- 

 culate, somewhat interrupted; glands of the disk compressed obovoid, 

 not coherent, shortly adnate to the calyx; filaments pilose; ovary stel- 

 late-tomentose, softly muricate; styles twice or thrice dichotomously 

 2-parted. On the plains. Hall & Harbour, 514. Banks of the Platte, 

 near Denver, Dr. Smith ; B. H. Smith ; Porter. Canon City, Brandegee 



ARGYROTHAMNIA 1 HUMILIS, Mull. DC. Prod., 15, 732. (Apliora 

 humilis, Eng. & Gr. PI. Lind., 1, p. 54.) Stem about I 6 high, much 

 branched, silky or strigose-pubesceut, branches spreading, ascending, 

 compressed, angled; leaves narrowed at the base, spatulate or obovate- 

 lanceolate or linear-lanceolate, acute, entire, sparingly pubescent, with 

 appressed hairs; raceme shortened, much shorter than the leaves, on 

 very short peduncles; pedicels of the male flowers very short, of the 

 fertile thrice shorter than the calyx. Pueblo, Greene. 



I ARGYROTHAMNIA, Miill. DC. Prod., 15. Male calyx valvate; female imbricated. 

 Petals alternate with the calyx-segments ; evolute or rarely suppressed. Glands of 

 tlie disk opposite the divisions of the calyx, alternate with the petals. Female disk 

 hypogonous, free ; male free or connate with the stamineal column. Stamens cen- 

 tral, outer ones opposite the 5 petals ; anthers dehiscent on each side. Rudiment of 

 an ovary none. Ovules 1 in each cell ; carpels 3, 2-valved ; seeds globose, not arilled. 



