134 Proceedings of the Biological Society of Washington. 



Cerro Matzize, vicinity of San Luis Tultitlanapa, Puebla, Mexico, July, 

 1907, by C. A. Purpus (no. 2775). 



Purpus's no. 2774, from the Cerro de Paxtle, in the same region, also 

 appears to be of this species, differing only in the somewhat larger leaf- 

 lets with broader apices. 



In Fedde's monograph of the genus Mahonia* this plant would fall 

 near M. andrieuxii (Hook. & Arn.) Fedde, a species in which the leaflets 

 have numerous small appressed teeth. Odostemon quinquefolius seems 

 to belong rather with M. zimapana and the related species, all of which, 

 however, have more numerous leaflets. 



Deutzia occidentals Standley, sp. nov. 



Shrub, sometimes 4.5 meters high; branchlets brownish, finely stellate- 

 pubescent; petioles 2.5-7 mm. long; leaf blades lanceolate or ovate, 

 2-4.5 cm. long, 0.8-2 cm. wide, rounded or obtuse at the base, narrowed 

 to the acute or obtuse apex, green on the upper surface, very rough with 

 fine stellate hairs, grayish-white or yellowish-white beneath, with a 

 dense covering of loose stellate hairs, some of the hairs sessile and some 

 stipitate, the margins of the blades finely and unequally dentate, the 

 venation impressed on the upper surface but prominent beneath ; corymbs 

 many-flowered, 2.5-5 cm. wide, the flowers mostly slender-pedicellate; 

 calyx densely stellate-pubescent, the lobes ovate-oval, 1.5-2 mm. long, 

 obtuse or acutish; petals 3-4 mm. long; stamens 12-15, the filaments 

 slender, entire. 



Type in the U. S. National Herbarium, no. 841336, collected in the 

 Barranca del Oro, Puebla, Mexico, altitude 2100 to 2400 meters, August, 

 1909, by C. A. Purpus (no. 3970). 



Additional specimens examined : Cerro de Gachupfn, Puebla, Purpus 

 3924. Sierra de San Felipe, Oaxaca, alt. 900 meters, Pringle 4691. Near 

 Reyes, Oaxaca, alt. 200 to 300 meters, Nelson 1810. 



The last collection cited may represent a different species, for the leaves 

 are much larger and broader than in the other specimens cited. 



Two other species of Deutzia have been described from Mexico, D. 

 mexicana Hemsl. and D. pringlei Schneid. Most of the representatives 

 of the genus occur in eastern Asia, and for the American ones Smallt 

 proposed a new genus, Neodeutzia. The separation is based upon the 

 fact that the Mexican specimens have slender entire filaments, rather 

 than broad bidentate ones. Since the latter character is not constant in 

 the Asiatic species, it seems better to refer the American plants, also, to 

 Deutzia. Neodeutzia ovalis Smallt is a synonym of Deutzia pringlei 

 Schneid§, both having been described from the same collection. 



The two earlier Mexican species of Deutzia differ from D. occidentalis 

 in the very fine, close pnbesence of the lower surface of the leaves, this 

 composed of similar rather than unequal hairs. 



* Bot. Jahrb. Engler 31: 30-133. 1901. 



t N.Amer. Fl. 22: 161. 1905. 



t N. Amer. Fl. 22: 162. 1905. 



§ Mitt. Deutsch. Dendr. Ges. 1904: 186. 1904. 



