Distribution: Southern Siberia, south-western Asia, central Asia, northern Mongo- 

 Ha, the Amoor Province, Manchooria. 



Poa palustris L. Syst. ed. X (1759) p. 874, Spec. PI. ed. II (1762) p. 98- Eptu. $.i. 

 Ajt. VII (1914) p. 1657. Poa ferlilis Host, Gram. Austr. Ill (1805) p. 10 ex parte; Ledeb. 

 Fl. Alt. I, p. 98 ex parte; Karel. et Kiril. Enum. PL Fl. Alt. no. 923. Poa serotina 

 Ehrh. Beitr. VI (1791) p. 86; Turczan. Cat. Baical. no. 1322; Ledeb. Fl. Ross. IV, p. 375; 

 Turczan. Fl. Baical.-Dahur. (1856, I) p. 39, no. 1329. 



In the territory explored this species varies considerably both in breadth and 

 roughness of the leaves, richness and density of the spikelets in the panicle, size of the 

 spikelets, and number of the florets of each spikelet, varying from 2 to 6. Some of the 

 specimens collected have the branches of the panicle very short, stiff and pointing 

 upwards along the rachis, unbranched, each branch with one spikelet only, the plant 

 thus assuming, in point of habitus, a much deviating appearance. 



The species is common in the territory explored, in moist meadows, on the banks 

 of small lakes and rivers. 



On the banks of the river Abakan, near Askys, and on the islets in the river, between 

 Minusinsk and Kushabar, the Amyl valley, Ust Algiac, Ust Sisti-kem, and at Ust 

 Kamsara. In moist, grass-grown depressions on the Abakan Steppe I have collected a 

 form furnished with long stolons, (f. slolonifera) 



Distribution: The species is distributed over the greater part of northern and middle 

 Europe, Italy, The Balkan Peninsula, Asia Minor, Caucasia, Siberia, northern Mongo- 

 lia, central and eastern Asia, Sakhalin, Japan, North America. 



Poa caesia Smith, Fl. Brit. (1800) p. 103; Karel. et Kiril. Enum. PI. Fl. Alt. no. 925; 

 Ledeb. Fl. Ross. IV, p. 374. 



In the Sayansk mountains, in moist places, above the tree hmit, some specimens 

 belonging to a very fine and slender form were collected by me. This form is separated 

 by me as: 



siibspec. esuriens nov. subspec. 



Caulibus tenuibiis et subtilibus ab forma typica differens. Spiculae parvae, 2-2,5 

 mm. longae, fusco-violaceae, flosculos singulos vel binos in se continentes. Rami panicu- 

 lae summae temiitalis, capillacei, divaricati, valde scabri, flexuosi, 2 fere (vel rarius 1-3) 

 spiculas pedicalis longis singuli ferentes. 



It is chiefly distinguished by having the spikelets very small, from 2 to 2,5 mm. 

 long, each one containing 1 or 2 florets only. Panicle about 10 cm. long, rather 

 rich in spikelets, rachis flexuous, rough, and furrowed, its branches capillaceous, 

 from 2 to 3 in a whorl, of a greenish-violet colour, rough, spreading, flexuous, 

 each branch generally with 1 to 2 dark, brownish-violet spikelets. Glumes nearly equally 

 long, 2 mm. in length, tapering to a point, the upper one with 3, not very prominent ner- 

 ves, greenish-violet, with a bioad membranous margin of a violet hue, slightly rough 



134 



