183 



and P. aulacophyllus Kr. Scb. Of these species P. pamiricus comes 

 nearest to P. juncifolius (cfr. Verb. d. k. k. zool.-bot. Gesellscb. 

 in "Wien, B. XLV, 1895), but difl'ers from it by the broader sheaths 

 (by which it comes near to P. vaginatus), and much larger ligules, 

 unbranched stems, apparently lateral peduncles and by the whole 

 stouter structure. 



P. pamiricus has only been found once before in Kuenluen 

 at the source of the river Hoangho 1894 by W. J. Kaborowsky 

 (St. Petersburg herbarium for Central-Asia, N. 411). — The two 

 localities are not far from each other, and under the same 

 northern latitude (35°). — It seems to be endemic for Central- 

 Asia. 



11. P. sp., ad forma P. filiformis. 



N. 1143. Pamir, in the lake Biiluug Kul, depth 1— 2-". Alt. 3800». 

 Aug. 21. 1898. 



II. Zannichellia Micheli (det. 0. Hagström). 



12. Z. pedicellata Fr. 



N. 217. Buchara, in ponds. May 15. 1808. 



N. 225. Buchara, in running water. May 16. 1898. 



N. 1116. Pamir, in the lake Jashil Kul, depth 1-2'". Alt. 3800° 



Aug. 15. 1898. 

 N. 1962. Chiwa, in a stream. July 2. 1898. 



— — forma gracilis. 

 N. 224a. Buchara, in a saline pond. May 16. 1898. 



III. Ruppia L. (det. 0. Hagström). 



13. R. rostellata Koch. 

 N. 224b. Buchara, in a saline pond. May 16. 1898. 



