742 
Involucre 5 mm. high or less; leaves pinnat- 
ifid almost to the midrib, the segments 
very Narrow.......-.--..2-2---.....2.- 19. 
Leaves merely toothed or entire. 
Leaves, at least the lower, triangular or tri- 
angular-cordate; plants usually 1 meter 
high or taller.................22-0.00000- 
Leaves not triangular, narrowed at the base; 
plants lower, seldom more than 30 cm. 
high. 
Leaves lanceolate or elliptic, acute, den- 
ticulate; stems simple.................22. 
Leaves obovate or oval, obtuse, coarsely 
salient-dentate; stems branched 
Upper leaves of the stems much reduced. 
Rootstock very short, never woody; leaves 
lanceolate, denticulate; stems stout, 40 cm. 
high or less.............2..2.00-020022----- 23. 
Rootstocks elongated, horizontal or ascending, 
woody; leaves various; stems low or tall. 
Leaves linear, less than 2 mm. wide; plants 
small, usually less than 15 cm. high...... 24. 
Leaves 5 mm. wide or more; plants mostly 
taller. 
Plants glaucous.............. wee eee eee eee 25. 
Plants not glaucous, 
Plants tall, stout, 50 cm. high or more; 
heads very numerous; bracts with 
black tips.........2....2.2220.0.0... 26. 
Plants lower, slender, mostly less than 50 
cm. high; heads few; bracts not with 
black tips. 
Leaves and stems permanently floccose. 
All leaves pinnatifid, with toothed 
segments.......-.......-.......-27. 
Leaves merely coarsely toothed, the 
segments entire................. 28. 
Leaves and stems finally glabrate. 
Basal leaves pinnatifid.............. 29, 
Basal leaves not pinnatifid. 
Leaves very thin, yellowish. 
Basal leaves very deeply cordate, 
with a narrow sinus......... 30. 
Basal leaves not deeply or not at 
all cordate. 
Basal leaves cordate.......... 3. 
Basal leaves not cordate. 
- Basal leaves oblanceolate or 
elliptic-oblong, attenu- 
ate at the base, serrate. .32. 
Basal leaves oblong or ovate, 
not attenuate at the 
base, crenate............ 33, 
8 
S, 
CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
. macdougalii. 
. triangularis. 
crassulus. 
. carthamoides. 
. lapathifolius. 
. thurberi. 
. microdontus. 
. atratus. 
S. fendleri. 
8. 
S 
canovirens. 
. multilobatus, 
. cardamine, 
. pseudaureus, 
. quaerens. 
S. flavulus. 
