596 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
Akenes glabrous. 
Basal leaves obovate or 
oblanceolate, dentate 
only toward the apex.. 9. 8. eymbalarioides. 
Basal leaves  crenate- 
dentate from the base 
to apex or subentire. 
Glabrous; basal 
leaves nearly quad- 
rangular, sinuate, 
dentate or entire. 10. S. fraternus. 
More or less pubes- 
cent, especially in 
the leaf axils; 
leaves often cune- 
ata at base....... 8. S. adamsi. 
Leaves not at all pinnate nor pinnatifid. 
Rootstock woody; stems low; leaves smali, thick... . 26. S. ductoris. 
Rootstock none or not woody; stems tall; leaves, at 
least. the basal ones, large. 
Stems tall, clustered, leafy to the inflorescence. 
Leaves  triangular-lanceolate, petiolate, 
coarsely dentate. ........----------+--- 24, S. trianqularis. 
Leaves lanceolate, sessile 
Margin of leaves evenly serrate... -- - 25. 
Margin of leaves entire...........-..- 25a. 
Stems usually solitary; leaves mostly basal, 
the cauline much reduced. 
Herbage wholly glabrous 
. serra. 
mH 
. serra lanceolatus. 
Leaves glaucous, quite fleshy, mostly 
entire.........------------------ 17. S. hydrophilus. 
Leaves not glaucous, mostly dentate. 
Bracts of the involucre 6 to 7 mm. 
long, stramineous ......-.----- 18. S. hydrophiloides. 
Bracts of the involucre 7 to 8 mm. 
long, brownish ....-.--------- 19. S. foetidus. 
Herbage more or less pubescent with long 
jointed somewhat intermixed hairs. 
Heads discoid... ....--------------- 20. S. vaseyr. 
Heads radiate. 
Heads 8 to 10 mm_ high in an- 
thesis; bracts of the involucre 
- 
usually 13,from 5 to 7 mm. 
oy 
i=; 
73 
bo 
—_ 
oa 
. exaltatus. 
Heads 10 to 12 mm. high in an- 
thesis: bracts of the involucre 
about 21, from 6.5 to 8.5 mm. 
long. 
Inflorescence open .....----- 22. S. atriapiculatus. 
Inflorescence dense.........- 23. S. condensatus. 
1. Senecio vulgaris L. Sp. Pl. 2. 867. 1753. . GROUNDSEL. 
ry , . Ty ;* “ 
[ype Locauity: European. 
SPECIMENS EXAMINED: Pullman, Piper, June 2, 1894; Seattle, Piper in 1885; Lower 
Cascades, Suksdorf, Mey 29, 1886. 
