114 The Ottawa Naturalist. [Oct. -Nov. 



SOME CANADIAN SENECIOS. 



By J. M. Greenman, Chicago, III. 



In the preparation of a monograph of the North American 

 species of the genus Senecio, the writer, through the kindness 

 of Messrs. John and James M. Macoun, has had the privilege 

 of studying the entire representation of this genus in the her- 

 barium of the Geological Survey of Canada. This collection is 

 especially rich in northern forms, and in many instances excellent 

 series of specimens illustrate individual species of northern 

 distribution. Several plants, however, have been found 

 which hitherto seem not to have been described; these, 

 associated with material from the Gray Herbarium and the 

 herbarium of the Field Museum of Natural History, are 

 characterized and recorded, as follows: 



Senecio Burkei, sp. nov. 



Herbaceusperennis; caulibuserectis 3-9 dm. altissimplicibus 

 vel rarius ramosis striatis glabris; foliis inferioribus petiolatis 

 ovato-oblongis 2-10 cm. longis 1-4. 5 cm. latis ad apicem obtusis 

 vel rotundatis basi cuneatis vel subtruncatis, foliis superioribus 

 irregulariter inciso-dentatis vel pinnatifidis sessilibus et sub- 

 amplexicaulibus et sursum gradatim reductis; inflorescentiis 

 corymboso-cymosis ; capitulis plerumque numerosis 10-12 mm. 

 altis radiatis; bracteis involucri circiter 21 lineari-lanceolatis 6-8 

 mm. longis glabris vel floccoso-tomentulosis plus minusve pur- 

 purascentibus ; floribus femineis ligulatis ca. 12; floribus disci 

 numerosis (50-60); achaeniis glabris. Collected on the "east 

 slope of the Rocky Mountains" by Burke (hb. Gray) type. 

 Alberta: by the reservoir, Banff, 30 October, 1899, N. B. 

 Sanson (hb. Geol. Surv. Canada, no. 22288) ; vicinity of Banff, 

 July, 1906, N. B. Sanson, (hb. Geol. Surv. Canada, without 

 number, and hb. Field Museum, cat. no. 288351) ; Banff, 28th July, 

 1904, Miss Edith M. Farr (hb. Field Museum, cat. no. 189413); 

 mountain slopes, Crows Nest Pass, 31 July, 1887, /. Macoun (hb. 

 Geol. Surv. Canada, no. 22785 in part). British Columbia : open 

 thickets, Spences Bridge, 31 May, 1889, J. Macoun (hb. Geol. Surv. 

 Canada, no. 1481 1 in part) ; shaded banks, mouth of Silica Creek, 

 Chilliwack River, 29 June, 1901, /. M. Macoun (hb. Geol. Surv. 

 Canada and hb. Grav, no. 26685); on a bog in Chilliwack Lake, 

 19 July, 1901, J. M. Macoun (hb. Geol. Surv. Canada, no. 26682a) ; 

 in a marsh east of Chilliwack Lake, 25 July, 1901, J. M. Macoun 

 (hb. Geol. Surv. Canada and hb. Gray, no. 26682); foot of a 

 snow slide, Middle Creek, Chilliwack River, 2 August, 1901, 

 /. M. Macoun (lib. Geol. Surv. Canada, no. 26681); in thicket 



