Nelson : New Plants prom Wyoming 271 



Bot. Calif. 7: 444 (under Laurentid) and by Torrey in Cat PL 

 Hayden Rep. 488, 1872. The flowers of the present species are 

 unusually showy and handsome for the size of the plant. It was 

 found in abundance on the muddy borders of shallow ponds near 

 Jackson's Lake, Aug. 17, 1899. 



/ 



Senecio perplexus 



Rootstock very short, with numerous semi-fleshy roots ; the 

 single stem erect, rather stout, 2.5-5 dm. high, loosely arachnoid 

 or floccose woolly when young as are also the leaves, becoming 

 glabrate but usually some of the woolly or crinkeled hairs persist- 

 ing, especially on the petioles, even at maturity, rather leafy be- 

 low, i. e., on the lower ^ of the stem : the lower leaves oblan- 

 ceolate or broader or tapering uniformly to both ends, mostly 

 obtuse, 5—10 cm. long, the margined petiole usually shorter than 

 the blade ; the middle leaves mostly sessile and narrower and be- 

 coming linear : the uppermost small and bract-like, all entire or 

 at most remotely denticulate, sometimes with a slightly crisped 

 margin: heads several (8-15), in a cymose corymb, 10—12 mm. 

 high, the central peduncles very short, the lower or outermost 

 elongating and often overtopping the others, the rays conspicu- 

 ous, few (5-10); the involucral bracts linear, black- tipped, about 

 7 mm. long, scarcely thickened dorsally and with thin margins : 

 akenes (mature) brownish, finely striate, glabrous, linear, equaling 

 or longer than the fine soft pappus. 



This species now proposed is a part of that Rocky Mountain 

 aggregate long known as 5. lugens. As has been shown by Dr. 

 Greene (Pittonia 3 : 1 70) S. lagens proper belongs to the far north 

 and S. lugens of Hooker's Flora is a very different plant of British 

 Columbia and the northwestern United States. This Dr. Greene, 

 /. c, characterizes and names vS. Colwnbianns but it has more 

 recently appeared as 5. atriapicnlatus* The Rocky Mountain 

 plant differs materially from this northwestern ally as it does also 



# 



from another of the far West to which it is sometimes referred, 

 viz, 5. exaltatns Nutt. 



Recently Dr. Rydberg, /. c, has published some related 

 species but none of them are closely allied except 5. araclinoides 

 which is distinguished from this by the sinuate-dentate 'leaves, the 

 more copious pubescence, the auricled stem leaves and the thick 

 involucral bracts. 



* Rydb. Mem. N. V. Bot. Gard. i : 442. 1900 



