182 
N. 1445, 1446. Pam ir, prov. Wakkan (Iskkashim), in a pond by Kang. 
Alt. 2000 m . Oct. 1. 1898. 
N. 1590. Pam ir, in a spring by Tsbatir Tasb. Alt. 4000 m . Marcb 14. 
1899. 
10. P. pamiricus n. sp. 
Caulis strictus teres, in latere folio verso planiusculus, simplex 
vel subsimplex, 1 m. longns vel longior; internodia luteo-viridia, 
inferiora brevia (2 cm.), superiora longiora (8—12 cm.). Inferiora 
pars caulis vaginis aphyllis interdum dissol utis instructa; folia rigida, 
angustissime linearia, obtusa, 3—5 nervia, inferiora superioribus 
12—20 cm. longis 1—3 mm. latis breviora. Nervus medius (in 
siccis) latere inferiore elevatissimus. Axilli non ramiferi 1 ). Yaginæ 
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. Rbizomam non vidi. 
N. 644. Pam ir, in a pond by tbe lake Kara Kul. Alt. 4000*". July 1. 
1898. 
Potamogeton pamiricus belongs to tbe group Coleogeton Kcbb., 
and this group being divided in two well separated undergroups, 
viz. pectinatus- and filiformis group, it belongs to the latter; of 
hitberto described Potamogetoji-s]) ecies tbe following belong to 
tbe same group: P. filiformis Pers., P. juncifolius Kern., P. 
vaginatus Turcz., P. ambly ophyllus C. A. Meyer, P. strictus Pbil. 
') Only at tbe lowest axil of tbe two apparently opposite leaves at tbe 
base of tbe peduncle grows a sboot, wbicb apparently is a continua- 
tion of tbe stem, so tbat tbe peduncle is apparently lateral. 
