Guayanopa Canon. Sierra Madre Mts.. Chihuahua, Mex., 3600 

 leet alt., in the Tropical Life Zone, Sept. 24. 1903. Near to E. 

 Palmen and tilicaule. 



Polymnia nervata n. sp. 



Stout and robust herbs 4-6 feet high ; leaves lar^e, oppo- 

 site, deltoid-triangular in outline. 3-lobed. tips acumunate, 

 very rough; flowers cymosely panicled and terminal central 

 ones long-pedunculate; outer scales oblong to oblong-ov 



about 1 innpr nnrr^^r^^ „11 „u^ _ '^ . • . . .. ^ . . 



, Y - """-vv.., all obtuse; rays wnite, tully 1 inch 



ong, about 5, oblong-elliptical; leaves with entire margins 

 CuHSI^^ £m7' ^'?'^ ^^^"^'^ ^^^^- Chihuahua. Max., 

 Sept 190o. 3600 feet alt., in the Tropical Life Zone 



Engeron tenuicaulis n. sp. 

 with^rT^^'"^. ^' ,^>'^^^stns, but a stoloniferous perennial 

 verv fj'f' ^f underground stems in very open tuffs ; stems 

 IrrL 2 ■ ^'^^^Y''^ o"ly at base, more slender and more 

 '4 6 rnPh^"" i" ; ^y'^^^^^s; a" peduncles long and bracteate 

 4-b nches long) ; root leaves oval-obovate with blade 6-12 

 Imes long and .vith 2 teeth near the middle cuneate at ba^^e 

 verv obtn".t''^? f^"f^' P^^J""^^^ ^''^"^ t^'-^e times the blade', 

 mooth ow'^r t ^^^"' "^/""'^^y pubescent, but appearing 

 iTe unJrT '^""^ J^^^^^l^near-oblanceolate and acute, en- 

 Unclef a 1 ent?' ^f ^^^^^^^ very niuch reduced on the pe- 

 uuiicies. ail entire; flowers white; ravs linear :ihn,,t qn A lin^c 

 vitf . °Lf ^:'"T''= ^°rP'™°"''y -^''<' -■'l^^ktned and 

 scaUs aboit /Zl /". """^ P="''"S "'° 'ho^« °f 'he head; 

 linear LZl S ) fP-'^ *^™°™'^ =""' ritnd below resinous, 

 high ;■ flowers abZ llTE^.V^'f" V'"'' "I'"*'- ^ "T 



Erigeron sylvestris n. sp. ' 



f ufted annual or biennial «MfU « ^r . 

 with the habit of E macranth ofTshoots or stolons, 



below and corvmboselv hranM,"^i ^^^'^^ striate stems simple 

 5ong and bracteate latera'on^r if' '^P= ?'^'"^ peduncles 

 open; whole plant 'shortly stnW low '"^^^^-^"^ ^^ 

 oblong, sessile 1 inch uZr "'^°_f^ ; ^^wer leaves spatulate- 

 ly^ inches long iarrowlv^'oM'^^^'^""^ °b^"^^' "^a'" ^^^^^^ 

 sile, 4 lines wiS all en^ ;. ^''"f ' -^^^"^^ but apiculate. ses- 

 ' ^^' ^"*''^^' on the inflorescence gradually re- 



