338 



SCIENCE 



[N. S. Vol. XXVII. No. 687 



much to give a clearer idea of the ecology 

 of the original prairies. 



Type Specimens of American Grasses in 



European Herbaria: Professor A. S. 



Hitchcock, Bureau of Plant Industry. 



In order to complete a revision of the 



North American species of Panicum it was 



necessary to consult the tj^Des deposited in 



European herbaria. The following list of 



collections consulted may be of interest to 



those who contemplate doing similar work, 



for the exact location of some of these is 



not generally known. 



Antwerp : Herbarium of Dr. Van 

 Heurck. Collection of Salzmann from 

 Bahia. 



Brussels: Jardin Botanique de I'Etat. 

 Collection of Galeotti from Mexico. Some 

 Fournier types. 



Paris: Museum d'Histoire Naturelle. 

 General herbarium: types of Desvaux, 

 Steudel, Fournier, Richard, Kunth 

 (H.B.K.). Segregated: herbaria of Mi- 

 chaux and of Lamarck; herbarium of 

 Cosson with some Poiret types; and of 

 Drake del Castillo with some Michaux 

 types sent by Richard. 



Madrid: Jardin Botanico. Types of 

 Lagasca and CavaniUes. 



Florence: Orto Botanico. Types of 

 Poiret (cited in Encyc. Suppl. as " herb. 

 Desfont."). 



Padua: Orto Botanico. A collection of 

 Bosc from Carolina. 



Geneva: Herbarium. Delessert and the 

 private herbaria of de Candolle and of 

 Barbey (Plerb. Boissier). 



Munich: Botanisches Museum. Collec- 

 tion of Martins from Brazil, with types of 

 Nees and Doll. 



Vienna: K. K. Naturhistorisches Hof- 

 museum. 



Graz: Private herbarium of Professor 

 Hackel, now at Attersee. 



Prague: Collection of Haenke with 



Presl's types; part at the Botanical Gar- 

 den of the German University and part at 

 the Bohemian Natural Museum. 



Halle : Botanischer Garten. Professor 

 Mez allowed me to consult the collections 

 of Panicum loaned him by several institu- 

 tions. 



Leipzig: Botanischer Garten. No grass 

 types from America. 



Gottingen: Botanischer Garten. Types 

 of Grisebach (Wright's Cuban plants and 

 types from Argentina) and of Meyer 

 (Prim. Fl. Esseq.). 



Bei'lin : Botanischer Garten at Dahlem. 

 Types of Link, Sprengel, Kunth, C. Muel- 

 ler and Nees (Sellow plants from Brazil). 

 The Willdenow herbarium is segregated. 



St. Petersbui'g: Herbarium Trinius at 

 the Imperial Academy of Sciences and the 

 general collection at the Botanical Garden 

 with Fournier 's types based on plants of 

 Karwinsky and F. Mueller. 



Stockholm : Natural History Museum. 

 Herbarium of Swartz's West Indian plants 

 and the types of Fries and Lindmann from 

 Argentina. 



London: Three large collections. Royal 

 Gardens at Kew, with types of Grisebach 

 (PL Br. W. I.), Bentham and Pursh. 

 British Museum (Dept. Botany), the col- 

 lections of Walter and of Sloane, segre- 

 gated and those of Raddi, Rudge, Robert 

 Brown, and Gronovius. The Linnean 

 herbarium at the rooms of the Linnean 

 Society. 



The Bisexual Inflorescence of H^imuhis 

 lupulus: Dr. W. W. Stockberger, Bu- 

 reau of Plant Industry. 

 Humulus lupulus L. is regarded as a 

 strictly dioecious plant, but at rare intervals 

 cultivated forms of the common hop have 

 been observed bearing on the same flower- 

 ing branches both staminate and pistillate 

 flowers. By several observers these pistil- 

 late flowers are regarded only as aborted 



