182 



N. 1445, 1446. Pamir, prov. Wakhan (Ishkashim), in a pond by Kang. 



Alt. 2000". Oct. 1. 1898. 

 N. 1590. Pamir, in a spring by Tsbatir Tash. Alt. 4000». March 14. 



1899. 



10. P. pamiricus n. sp. 



Caulis strictus teres, in latere folio verso planiusculus, simplex 

 vel subsimplex, 1 m. longus vel longior; internodia luteo-viridia, 

 inferiora brevia (2 cm.), superiora longiora (8 — 12 cm.). Inferiora 

 pars caulis vaginis aphyllis interdum dissolutis instructa; folia rigida, 

 angustissime linearia, obtusa, 3 — 5 iiervia, inferiora superioribus 

 12 — 20 cm. longis 1 — 3 mm. latis breviora. Nervus médius (in 

 siccis) latere inferiore elevatissimus. Axilli non ramiferi^). Vaginae 

 magnæ, 2 — 3 cm. longae, 4 — 7 mm. latae, rigidæ, virides, multi- 

 nerviae, subinflatae, earum margines versus basin membranaceæ. 

 Ligulæ subpersistentes obtusæ, superiores saltem vaginis fere 

 dimidia parte breviores. Pedunculus spiciferus 3 — 4 cm. longus 

 rigido-erectus, crassitudine æqualis, foliis multo brevior, ex axillis 

 superioribus nascens, realiter terminalis sed ad latus inflexus ita 

 ut lateralis videtur. 



Spicae pauciflores intervallis brevibus inter glomerulos. Fructus 

 immaturus parvus, obliquo-ovatus, stylo brevi, stigma obliquo- 

 discoidea. ßhizomam non vidi. 



N. 644. Pamir, in a pond by the lake Kara Kul. Alt. 4000". July 1. 

 1898. 



Potamogeton .pamiricus belongs to the group Coleogeton Kchb., 

 and this group being divided in two well separated undergroups, 

 viz. pectinatus- and filiformis group, it belongs to the latter; of 

 hitherto described Poto?«o_^eto?i-species the following belong to 

 the same group : P. filiformis Pers., P. juncifolius Kern., P. 

 vaginatus Turcz., P. amblyophyllus C. A. Meyer, P. strictus Phil. 



') Only at the lowest axil of the two apparently opposite leaves at the 

 base of the peduncle grows a shoot, which apparently is a continua- 

 tion of the stem, so that the peduncle is apparently lateral. 



