1914) 
GREENMAN—NORTH AMERICAN SENECIONE/E 207 
Senecio ($ Tomentosi) macropus Greenm. Monogr. Senecio, 
pt. 1, 24. 1901; in Engl. Bot. Jahrb. 32: 20. 1902, nomen. 
S. arizonicus Gray, Syn. Fl. 17: 392. 1884, in part, as to plant 
of Rusby. 
Radix robusta in sieco 2.5 cm. diametro; caulibus erectis usque 
ad 7.5 dm. altis glabris vel in axillis foliorum albo-tomentulosis 
striatis plus minusve purpurascentibus; foliis radicalibus petio- 
latis lyrato-pinnatifidis petiolo incluso 10-14 em. longis 4-5 em. 
latis, segmentis paucijugis ineequalibus terminali majore ovato- 
oblongis 5-6 em. longis grosse dentatis, ceteris cunPatis et den- 
tatis vel linearibus et integris; foliis caulinis remotis sessilibus 
pinnato-lobatis semiamplexicaulibusque sursum sensim reductis; 
infloreseentiis terminalibus corymboso-cymosis; (apitulis ca. 
1 em. altis radiatis, ligulis flavis; involucris campaniilatis minute 
calyeulatis; involucri squamis circiter 21 lineari-lanceolatis 6.5- 
8 mm. longis acutis glabris maturitate retrorsis; oribus disci 
numerosis; acheniis glabris. | 
Specimen examined: | 
Arizona: without definite locality, coll. of 1883, H. H. Rusby, 
175 (Gray Herb.), TYPE. 
Professor Rusby's plant was referred by Dr. Gray to S. 
arizonicus Greene, but from the very large root, the sublyrate, 
smooth and even somewhat glaucous radical leaves, and nearly 
naked stem it seems amply distinct. 
Senecio ($ Tomentosi) oreophilus Greenm. Monogr. Senecio, 
pt. 1, 24. 1901; in Engl. Bot. Jahrb. 32: 20. 1902, nomen. 
S. neo-mexicanus Gray, Proc. Am. Acad. 19: 55. 1883, in part; 
Syn. Fl. 1?: 392. 1884, in part, as to plant of Greene. 
Herbaceous perennis juventate ubique tomentulosus denique 
plus minusve glabratus; caule tereti erecto striato 2-3 dm. 
alto subnudo 2-3-bracteato; foliis rosulatis petiolatis oblongo- 
oblanceolatis vel oblongo-cuneatis petiolo incluso 3-10 em. longis 
0.7-2.5 em. latis supra mediam partem crenato-dentatis basi 
in petiolum sensim angustatis integriusculis juventate utrinque 
albo-tomentulosis mox glabratis; braeteis caulinis linearibus 
apice basique parum ampliatis dentatisque; inflorescentiis laxe 
corymboso-cymosis usque ad 1 dm. diametro; capitulis 10-12 
mm. altis calyculatis radiatis; involueris campanulatis basi 
tomentulosis ceteris glabris; involueri squamis plerumque 21 
