252 BULLETIN DE L'HERBIER BOISSIER. (4) 



8. P. Vaseyi Robbins in Gray, Man. N. U. J. éd. 5, 485 (1867). 



The submergea" form only, is contained in the herberium. The rare 

 flotting and fruiling form was foiind near Ottawa, Canada, and his spé- 

 cimens sent lo me are the best yet distributed in Europe, but my stock is 

 exhausled so I am unable to represent it in Ihe collection. A rare and en- 

 demie N. American species. 



In the herberium will be found a list of the species that are not contai- 

 ned in the collections, as I possess nearly every one of thèse in my own 

 collection, I shall at any time be pleased lo send thèse to the Herb. Bois- 

 sier, for any one who may he studying the genus, only asking that they 

 shall not be retained longer than neccesary. 



9. P. mexicanus Ar. Benn. J. of Botany 289 (1887). 



The best example I hâve seen is contained in the herberium with ex- 

 cellent fruit, the leaves in this spécimen are rather wider than those in 

 Herb. Mus. Brit; Herb. Berol; or in Herb. Prague; in which it appears- 

 under the m. s. name of P. peruviana Presl. 



10. P. polygonifolius Pour. Act. Toul. 3, 325 (1788). 



In the Flora of British India, Sir J. D.Hooker has reverted to the name 

 P. oblongus Yiv. (quoting his Student's Flora for Pourret's name). But Vi- 

 viani's name appeared in Anal. Bot. 2, 102 (1802) and Frag. H. Ital. 1, t. 2. 

 (1808), and so certainly is not a prior name. 



11. P. Glaytonii Tuckerman in Am. Jour. Se. and Arts. l st ser- 

 XIV, 38 (1843). 



For many years this N. American species bore the above name, but 

 there are at least two certain names that are earlier, it not more. In 

 1808 Rafînesque described in the Médical Repositary of New- York, se- 

 veral American species of the genus, and in 1811 he again described 

 others in the same work. Much doubt has always existed as to what 

 plants his names applied, and as no spécimens hâve been discovered 

 named by him (thèse he may hâve lost when he was shipkrecwed off 

 the U. States coast, and barely escaped with his life) it is difficult to be 

 certain in some cases as to what his names apply. However for various. 

 reasons I am inclined to think that his P. epipedhtjdrum (1808) is this 

 plant, it so, it will précède ail other names. D 1 ' Morong considers that P. 

 Nuttaldi Cham. (1827) is this species, certainly P. pensylvanicus Cham, on 

 the next page of Chamisso's memoir is the same, as Tuckerman has ini— 

 tialed « E. T. » to 2 spécimens is Willdenow's Herb. But Wolfgang in 

 R. & S. Mant. 3 (1827), also named the same plant P.pumilus, but the Lin- 

 naja slightly preceded the 3 rd Man lissa. In addition to the distribution 



