384 FIELD MUSEUM OF NATURAL HISTORY BOTANY, VOL. II 



INVOLUCRAL APPENDAGES GLABROUS: 

 Seeds triangular ovoid: 

 Angles not tuberculate, 



Sulci 4, closed, the two basal anastomosing, coat pitted; leaves serrate, hairs 



long, monocellular dioica 



Sulci 5, closed to mere slits, distinct, coat farinose; leaves serrate, hairs 



cottony, multicellular rutilis 



Sulci 5, shallow, concave, distinct, coat pitted; leaves entire, glabrous 



inaequalis 

 Angles tuberculate, 



Sulci 4, open, coat farinose; leaves serrate, hairy especially beneath indivisa 

 Seeds ovoid: 



Sulci 3, narrow, distinct; leaves fabiform, short crispid-hairy adenoptera 



Sulci 5, broad, the two basal often anastomosing; leaves lanceolate, scat- 



teringly straight-hairy conferta 



INVOLUCRAL APPENDAGES HAIRY: 



Seeds ovoid, sulci 6, closed to mere slits; leaves minutely crispid-hairy, stem 

 hairs moniliform densiflora 



INVOLUCRAL APPENDAGES WANTING: 

 Seed triangular-ovoid, 



Sulci 4-5, closed, the dorsal transverse the ventral oblique; leaves oblong- 

 ovate, crispid-puberulous monemis 



These species are as distinct in their distribution as in their characters. 



While the terminal species adenoptera, densiflora and indivisa are 

 strikingly clear-cut and constant in their special regions, dioica is 

 strongly mutational, hardly two specimens having been seen that 

 exactly duplicate each other. 



Chamaesyce dioica (Kunth) comb. nov. 



Euphorbia dioica Kunth, H. B. & K. Nov. Gen. et Sp. 2:53. 1817. 

 Euphorbia ocymoides Hook. & Arn. Bot. Beechy 310. 1841. non Linn. 

 Euphorbia anceps Benth. Bot. Voy. Sulph. 162. 1844: 

 Anisophyllum dioicum Kl. & Gke. Tricocc. 31. 1860. 



Shrubby, tufted, diffuse, procumbent; branches compressed, long- 

 villous except on the under surface, terete, less than 15 cm. long, hairs 

 monocellular. Inflorescence axillary, solitary or in threes, shorter than 



