Vol. 31, pp. 131-134 November 29, 1918 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



SIX NEW SPECIES OF TREES AND SHRUBS FROM 



MEXICO. 



BY PAUL C. STANDLEY.* 



Of the six new species described in the present paper, three 

 belong to the genus Vauquelinia, of the family Rosaceae, a group 

 essentially Mexican in its distribution, although two of its rep- 

 representatives extend into the southwestern United States. 

 One of the species described was indicated as new some years 

 ago by Mr. J. H. Painter, formerly Aid in the U. S. National 

 Herbarium. 



Two of the new species belong to Odostemon, for which the 

 later name Mahonia is often used, a genus formerly referred to 

 Berberis, but now commonly regarded as distinct. The last 

 plant described is a Deutzia, of the family Hydrangeaceae, the 

 third species to be reported from America. The genus is well 

 represented in eastern Asia, and some of its species are common 

 in cultivation. 



Vauquelinia potosina Painter, sp. nov. 



Branchlets tomentulose or finally glabrate; petioles 0.8-2.5 cm. long; 

 leaf blades narrowly oblong, 6-10.5 cm. long; 1-2.2 cm. wide, obtuse or 

 acutish at the base, acutish or obtuse at the apex, closely serrate, glab- 

 rous, green and lustrous on the upper surface, slightly paler beneath; 

 corymbs many-flowered, 4-7 cm. broad; calyx glabrous outside or nearly 

 so, the lobes ovate-oval, acutish, tomentose within on the margins; petals 

 broadly oval, 3.5 mm. long; fruit densely tomentose. 



Type in the U. S. National Herbarium, no. 570101, collected at Alvarez, 

 San Luis Potosi, Mexico, May, 1905, by Edward Palmer (no. 594). Col- 

 lected also at Bagre, in the same State, in June, 1911, by C. A. Purpus 

 (no. 5207). 



• Published by permission of the Secretary of the Smithsonian Institution. 



34— Proc. Biol. Soc. Wash., Vol. 31, 1918. (131) 



