180 
2. P. perfoliatus L. 
N. 1115. Pam ir, in the lake Jaskil Kul; deptk 1—2 m . Alt. 3800“. Aug. 25. 
1898. 
N. 1444. Pam ir, prov. Wakkan (Iskkaskim), in a pond by Rang. Alt. 
2700“. 
N. 2077. Transcaspia, in a fountain ky Artskman. Sept. 6. 1899. 
— — var. Muelleri A. Bennett Journ. of Botany XV (1887) 
p. 177. 
Tkis variety is ckaracterized by the skort, somewkat acute, 
reflexed leaves. Mr. Bennett bas been so kind to send me tke 
original specimens from Australia, and tkey agree perfectly with 
this plant. 
N. 1452. Pamir, prov. Wakkan (Iskkaskim), in running water by Nut. 
Alt. 2700“. Oct. 3. 1898. 
— — var. rotundifolia M. K. 
N. 1770. Transcaspia, in running water by Merw. June 3. 1899. 
N. 1936. Ckiwa, in a ckannel. July 9. 1899. 
3. P. lucens L. 
forma. 
The superior leaves have longer stalks than usually is tke 
case, and tkey are not so membranaceous as tke lower ones, but 
as tkis plant in all other ckaracters agrees with P. lucens , I will 
not refer it to the nearly related form P. Zizii M. K., whick is 
perkaps a hybrid. 
N. 2076. Chiwa, in a pond, former an arm of the river Amu Daria, by 
Giaur Kalå near the mountain Sultan Babå. Aug. 11. 1899. 
4. P. gramineus L. 
N. 616. Pamir, in a pond by Bordo-ba, by the Alai steppe. Alt. 3500“. 
June 28. 1898. 
5. P. crispus L. 
N. 127. Tashkent, in running water by Tsliinas. May 7. 1898. 
N. 1138. Pamir, in the lake Jashil Kul, depth 1—2“. Alt. 3800“. Aug. 15. 
1898. 
N. 1143. Pamir, in the lake Bulung Kul, depth 2“ Alt. 3800“. Aug. 21. 
1898. 
