1908] Greenman,— Notes on the Genus Senecio. 69 
parison of my plant with the specimens secured in eastern Quebec by 
Collins, Fernald and Pease the two appear to be identical. On the 
whole there is every reason to believe that the plant in question is a 
natural hybrid, and it seems worthy of characterization as follows: 
Senecio aureus > X Balsamitae, n. hyb., caulibus erectis 2.5-8 dm. 
altis glabratis vel sparse lanato-tomentosis; foliis inferioribus petio- 
latis oblongo-rotundatis vel oblongo-ovatis vel subellipticis 1-6 cm. 
longis 1-3.5 cm. latis, apice rotundatis vel obtusis marginibusque 
crenato-dentatis vel rarius acute-dentatis, basi subcordatis vel abrupte 
contractis et cuneatis superioribus lyratis vel laciniato-pinnatifidis; 
petiolis 2-15 cm. longis gracilibus; achaeniis glabratis vel sparse 
pilosis.— Stem erect, 2.5 to 8 dm. high, glabrous or nearly so; lower 
leaves oblong-rotund to oblong-ovate or subelliptic, 1 to 6 em. long, 
1 to 3.5 em. broad, rotund to obtuse at the apex, crenate-dentate or 
occasionally rather sharply toothed, the earliest subcordate, the later 
either abruptly or rather gradually contracted at the base into .the 
petiole; petioles 2 to 15 cm. long, slender; stem-leaves lyrate to 
laciniate-pinnatifid; inflorescence few to many-headed: heads me- 
dium sized: achenes glabrous or sparingly pilose, about one-third 
approximately developing perfect embryos.— Wet alluvial shores 
between Baldié and the Baie des Chaleurs, Bonaventure River, Province 
of Quebec, 5, 6, and 8 August, 1904, Collins, Fernald & Pease (hb. 
Gray); in low wet meadows, vicinity of Beach, Lake County, Illinois, 
16 June, 1907, Greenman, nos. 1991, 2022 (hb. Field Mus.). Asso- 
ciated with the two parent species, and intermediate in size, leaf- 
outline and in technical characters of the head, bearing rather more 
the general aspect, however, of S. aureus. 
Senecio BALSAMITAE Muhl., var. Crawfordii (Britton), n. comb. 
S. Crawford Britton, Torreya, i. 21 (1901). This plant, although 
at first taken to be distinct from 8. Balsamitae Muhl., upon the ex- 
amination of a large series of specimens cam scarcely be regarded as 
of more than varietal rank. Its somewhat more luxuriant growth, 
than is characteristic of typical forms of the species, is most probably 
due to the moist rich habitat in which it was growing. 
Еткі» Museum or Naturat History, Chicago. 
