452 MR. N. D. SIMPSON ON THE PLANTS OF 
AGROSTIS ALBA, Linn. 
No. 455. Driest part of the Ulu Kem valley-steppe. 
Distribution, Europe, N. Asia, N. Africa, N. and S. America, Australia 
and New Zealand. 
DEYEUXIA LAPPONICA, Kunth. 
No. 6. Dry mountain-summit of the Kizil Taiga where the surface is even 
and not too rocky. 
Distribution. Arctic Europe, Altai, Baikal and Yenisei regions, and in 
N. America. 
PHRAGMITES COMMUNIS, Trin. 
No. 97.  Fresh-water lagoons on edges of desert lakes, Achit Nor. 
No. 129. Southern aspects from 900 to 1700 m. in the neighbourhood of 
streams and under rather moist conditions, southern Great Altai Mts., upper 
Kran River. 
Distribution. World-wide. 
CATABROSA AQUATICA, Beauv. 
No. 81. Margins of swamps or small lakes. Immersed in water, Tula 
River. 
Distribution, Temperate regions of the N. hemisphere and in S. America, 
MELICA NUTANS, Linn. 
No. 327. Upper Amil River. 
Distribution. Europe and N. Asia, extending southwards into Asia Minor 
and Kashmir. 
Poa ALTAICA, Trin. 
No. 396. Shade of Larch and Scotch Pine in "alley bottoms of Shabash 
and Kamsara Rivers. 
Distribution. The Altai region. 
Poa Pricer, N. D. Simpson, sp. n. (PI. 28. figs. 4-12.) 
Affinis P. macrocalyci, Trautv. et Mey., sed panicula compactiore, glumis 
minoribus nec acuminatis, pedicellis lævibus, foliis supra subtusque glabris 
distineta. 
Culmi 85 em, alti, geniculati, rigidi, lreves, glauei, basi vaginis vetustis 
obtecti. Foliorum lamine subglauem, lineares, acutze, curvate, rigide, 
1-8 em. longæ, 0:5 em. late, preeter margines et carinam asperulas leeves, 
plicatæ vel explanatee ; ligule ovate 01-073. em. longze, hyalino-scarios ; 
vagin: quam foliorum caulinorum lamine multo longiores, superne carinatie, 
glabra, lreves, valde striate. — Panicula erecta compacta, 7 em. longa ; ram 
