4 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Society of London, where special attention was given to the types 

 of Linnaens filius and of Sir James Edward Smith ; (8) the her- 

 barium of the Royal Botanical Gardens at Kew, noteworthy to the 

 student of the Eupatorime by exhibiting the very numerous Brazilian 

 types of Gardner, Hooker & Arnott, Bentham, and Baker, as well as 

 the Mexican work of Hemsley; (9) the herbarium of the British 

 Museum of Natural History, including, among many other specimens 

 of high interest, the plants of Clayton, Walter, and Philip Miller. 



The writer would here express his sincere thanks to all those in 

 charge of these herbaria for their cordial hospitality, uniform courtesy, 

 and valuable aid during his researches. He is also indebted to Messrs. 

 Oakes Ames and A. A. Eaton for several excellent photographs of 

 type- specimens at Paris, to Mr. H. Hua for a critical comparison of a 

 Peruvian Piqueria in the herbarium of Jussieu, to Miss Mary A. Day, 

 Librarian of the Gray Herbarium, for bibliographical assistance, and 

 to Mr. F. V. Coville and Dr. J. N. Hose for the loan of the material of 

 Piqueria belonging to the United States National Museum. 



About four hundred photographs of types were taken in the Euro- 

 pean herbaria, some important exchanges effected, and many notes and 

 sketches prepared, which it is hoped may form an accurate basis for 

 considerable work on the group concerned. 1\\ the present paper only 

 a small part of the results of the summer's investigation can be pre- 

 sented, but as any complete or monographic treatment of so large a 

 group must be delayed for a considerable time, it seems best to record 

 such identities and synonymy as can be at once stated with definite- 

 ness, in order that certain traditional errors may not become more fixed 

 by longer usage. The nomenclature adopted is that recommended by 

 the international congress at Vienna. 



L Revision of the Genus Piqueria. 



Piqueria is the typical genus of the Piqueriiiae, a small subtribe of 

 the Eapatorieae. The Piquertnae are chiefly marked by their blunt 

 anthers, which entirely lack the more or less expanded, oblong, or 

 lanceolate prolongation of the connective, which is present almost 

 without exception in other Compositae. In this subtribe the genus 

 Piqueria is characterized by a complete absence or very rudimentary 

 development of its pappus. Its natural affinities are obviously on 

 one hand with Op/iri/osporu.% which scarcely differs save in the pres- 

 ence of a well-developed setose pappus, and on the other hand with 

 Ahmia and Ageratum, which are habitally approached by the species 

 of Piqueria belonging to the subgenus Phalacraea. Geographically 

 Piqueria extends from the Sierras of northern Mexico through central 



