468 MEMOIRS OF THE XEW YORK BOTANICAL GARDEN. 



lateral rows are broader and spreading. In woods, up to an altitude 

 of 2000 m. 



Montana: McDonald's Lake, 1892, R. S. Williams, gz^. 



Before PINACEAE insert : 



TAXACEAE. 

 *Taxus brevifolia Nutt. Sylva 3: 86 [Bot. Cal. 2: no]. 



A tree with leaves somewhat resembling those of the red fir, but 

 the fertile cones represented by a single ovule surrounded at the base 

 by an annular disk, which finally becomes fleshy and berry-like. It 

 is only found west of the Rocky Mountains. 



Montana: Columbia Falls, 1892, R. S. Williaiiis, p(5/. 



Before Pinus flexilis insert : 



* Pinus monticola Dougl. ; Lamb. Pin. 3: //. [Bot. Cal. 2: 123]. 



A tree 20-25 m. high, somewhat related to the White Pine of the 

 East, with slender yellowish brown cones 1.5-2.5 dm. long: leaves 

 in fives, 5-10 cm. long. 



Montana : Columbia Falls, R. S. Williams. 



On page 10, instead of Picea pungens, read : 



Picea Parryana (Andre) Sargent, Silva, 12: 47: Abies Menziesii 

 Parryana Andre, 111. Hort. 23: 198 ; Picea pungens Engelm. etc. 



On page 15, under Potamogeton natans, add the following locality : 

 Montana: Whitefish Lake, 1892, R. S. Williams. 



On page 18, after Ruppia pectinata, insert: 



* Naias Guadalupensis (Spreng.) Morong, Mem. Torr. Bot. Club, 



3^: 60 [111. Fl. i: 81]; Caiilinia Guadalupensis Spreng. Syst. 



I : 20. 



A plant somewhat resembling Zaniiichellia but with minutely 

 denticulate leaves and solitary ovaries in their axils. It has often 

 been confused with Naias Jiexilis, from which it differs in the 

 strongly reticulated seeds. The Montana specimens, as well as those 

 from Nebraska, differ from the more southern ones in the shorter 

 and more crisped leaves. In ponds, at low altitudes. 



Montana: Sand Coulee, 1891, R. S. Williams, SjS. 



On page 20, before * Panicum pubescens, insert : 

 Chaetochloa viridis (L.) Scribner, Bull. U. S. Dept. Agric. Div. 

 Agrost. I : 39 ; Panicum viride L. Sp. PI. Ed. 2, 83; Setaria 



