150 PROCEEDINGS OP THE AMERICAN ACADEMY 



EcpnoRBiA (Poinsettia) exclusa. Annual, erect, more or less 

 tomentose throughout, a foot high, the strict rather stout branches 

 becoming naked : leaves scattered, narrowly linear, attenuate to each 

 end, entire or serrulate, the margin becoming revolute, 1 to 1^ inches 

 long : involucres in a short terminal subsessile cyme, very shortly 

 pedicelled, tomentose, hemispherical, the broad truncate lacerate lobes 

 united at base in front of the very short orbicular tomentose glands : 

 styles very short, stout, bifid: capsule tomentose, 2 lines long: seed 

 carunculate, oblong-quadrate, obsoletely tuberculate and rugose, 1^ 

 lines long. — At San Lorenzo de Laguna, Coahuila (1218). Nearly 

 allied to E. eriantha. 



Euphorbia margtnata, Pursh. At San Antonio, Texas (1219). 



Euphorbia barbellata, Engelm. At Uvalde, Texas (1220). 



Euphorbia heterophylla, Linn., var. graminifolia, Engelm. 

 At Uvalde (1221) and Georgetown, Texas (2052). Also a peculiar 

 form, with the linear-lanceolate leaves sharply serrate and near the 

 base coarsely toothed; at San Luis Potosi (859 Schaffner). 



Euphorbia dentata, Michx. At Sutherland Springs, Texas 

 (1223), at Juraz, Coahuila (1222), and at Monterey, Nuevo Leon. 

 Also var. lasiocarpa, Boiss., at Parras, Coahuila (1224), and in 

 the San Miguelito Mountains, San Luis Potosi (858 Schaffner) ; 805 

 Parry &, Palmer. 



Euphorbia campestris, Cham. & Schlecht. In the Sierra Madre, 

 south of Saltillo (1225, 2054), and at Parras, Coahuila (1227), at 

 Guajuco, Nuevo Leon (1226), in the San Rafael Mountains (865 

 Schaffner), and at San Miguelito (864 Schaffner) and San Luis Po- 

 tosi (866 Schaffner), and at Guanajuato (Duges) ; 803 Parry & 

 Palmer. Different forms, but apparently all belonging to this species. 

 Duges gives the popular name " Yerba del Coyote." 



Euphorbia Lathyris, Linn. At Saltillo, Coahuila (2059) ; by 

 a garden fence. 



Euphorbia angusta, Engelm. At Sutherland Springs, Texas. 



Euphorbia acuta, Engelm. At Juraz, Coahuila. 



Euphorbia (Cyttarospermum) tenera. A slender annual, 

 about a foot high, sparingly pubescent, several times dichotomous : 

 leaves thin, opposite, without stipular glands, shortly petiolate, ellip- 

 tical, acutish at each end, 4 to 8 lines long: peduncles in the forks 

 and terminal, solitary, 1 to 6 lines long: involucres glabrous, the tube 

 nearly a line long, pubescent within, with oblong entire lobes ; glands 

 prominent upon a broad stipe, with an oblong-ovate subconcave entire 

 whitish appendage, the whole as long as the tube : ovary slightly 



