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XTII. Supplementary Notes on the Genus Najas. By Alfred Barton Rendle, M.A.^ 

 D.Sc, F.L.S., Assistant in Botany, British Museum. 



Bead 21st June, 1900. 



OiNCE the publication of my Revision of this genus (Trans. Linn. Soc. scr. 2, Bot. 

 vol. V. pp. 379-436) I have had an opportunity of visiting a number of important 

 continental Herbaria. I have worked through all tlie material which I could find of 

 the genus in the following public and private collections : — at Paris, the National 

 Herbarium in the Jardin des Plantes, and also the Herbaria of the late M. Cosson and 

 M. Drake del Castillo ; at Geneva, the Delessert Herbarium at the Bottmic Gardens, 

 the Boissier Herbarium, and the DeCandolle Herbarium ; at Zurich, the Herbarium 

 associated with the Botanic Gardens ; at Vienna, the Herbarium at the Hofmuseum and 

 the Herbarium associated with the Botanic Gardens ; at Berlin, the Imperial Herbarium 

 and also the private collections of Dr. Magnus. I take this opportunity of putting 

 on record my obligations to the various gentlemen associated with these collections for 

 their readiness to give me all the help possible and once more tender them my hearty 

 thanks. I am also indebted to the authorities at the St. Petersburg Botanic Museum 

 for a number of Russian and Central Asiatic specimens which Dr. Litwinow, the curator, 

 has sent to the Department of Botany of the British Museum. 



In the following notes I have included additional points of interest which I observed, 

 both in geographical distribution and in the elucidation of varieties or species. I saw 

 very few new forms, a circumstance which, though disappointing, argues for the 

 comparative completeness of my monograph as representing wliat is known of the genus 

 at the present time. 



Subgenus 1. Eunajas, Aschers. 



1. Najas marina, Linn. Sp. PI. 1015 (1753) ; Rendle in Trans. Linn. Soc. ser. 2, Bot. 

 V. 389 (1899). 



I have the following notes on the distribution of the three forms under which I 

 attempted to arrange the specimens in my revision : — 



a. A luxuriant form. I have seen specimens from the following districts not 

 previously noted : — 



France — Saon and Loire; Bordeaux (Baillet). 



Spain — Laguna de Dournos, Gallecia {Lange). 



Hungary — Marchfeld {Matz). 



South Russia— Mouth of the Volga, River Algari (Korshinsky). 



Australia— Lake Muir and Nichol Bay, West Australia {Mueller). 



SECOND SERIES. — BOTANY, VOL. V. ^ ^ 



