NEW PLANTS FROM NORTH DAKOTA 125 
the base, ciliate and often villous, and flowers 2.5-3 cm. in diameter, 
and from 7. occidentalis Britton which has bright green foliage, is 
taller, erect and simple-stemmed, with even the lower part of the 
bracts narrower than the leaves, and with petals about 14 mm. long. 
Collected by the writer on July 13, 1899, on bare, gravelly, 
sterile, open ground of that stretch of rolling prairie named Sand 
Hills in McHenry County, also lately in the same kind of soil at 
Pleasant Lake, Benson County. 
Senecio suavis sp. nov. 
Tota planta glabra, foliis crassis, firmis. Radix perennis, 
robusta, aut simplex conicaque, aut ramos nonnullos emittens, 
quorum singuli in caudice terminantur e quo caulis unus usque ad 
nonnullos oritur. Caulis 1-3 dm. altus. Folia caulina 3-5, lineari- 
lanceolata, 1-4 cm. longa, margine integro, vel undulato, vel serrato, 
vel pectinato, petiolis 0.5-2 cm. longis. Folia basilaria complura, 
late linearia—lanceolata, 3-4 cm. longa, 0.5-1 cm. lata, marginibus 
integris, vel crenatis, vel serratis, vel pectinatis, apice saepissime 
tridentato, petiolis 3-8 cm. longis. Caules capitula bina usque ad 
quaterna, 1 cm. longa, 0.5 cm. lata gerunt. Bracteae involucri 
circiter 17. Flores radiati circiter 6. Pappus albus. Achenia 2.5 
mm. longa, obscure pulla, 4-costata, singulis costis pilis albis ad- 
pressis vestitis. 
The whole plant glabrous with thick leaves of firm texture. Root 
perennial, stout, either simple and conical, or sending out several 
branches upwards, each ending in a crown from which one to sev- 
eral stems arise. Stem 1-3 dm. high. Stem leaves 3-5, linear- 
lanceolate, entire, wavy-margined, serrate or pectinate, 1-4 cm. 
long, with 0.5-2 cm. long petioles. Basal leaves very numerous, 
broadly linear to lanceolate, 3-4 cm. long, 0.5-1 cm. wide, with 
entire, or crenate, or serrate, or pectinate margin and oftenest tr 
dentate apex, petioles 3-8 cm. long. Heads 2-4 on each stem, 1 
cm. long, 0.5 cm. wide. Involucral bracts about 17. Rays about 
6. Pappus white. Achenes 2.5 mm. long, dull brown, 4-ribbed 
with a row of white appressed hairs covering each rib. 
Belonging to the same group as S. mutadilis Greene, S. triden- 
ticulatus Rydb. and .S. oblanceolatus Rydb., all of the Rocky Moun- 
tain flora, this species, and excluding other prominent characters, 
it differs from the first named by being perfectly glabrous and by 
its narrow basal leaves, and from the others by its extremely variable 
leaf margins and larger size. 
