Part 3, 1916] CARDUACEAE: ANTHEMIDEAE 
Segments of the basal leaves narrowly linear. 
Plant sparingly silky; inner bracts broadly oval, 
rounded at the apex; corollas mostly purplish. 
Plant densely silvery-silky; inner bracts ovate, 
acutish; corollas yellow. 
Leaves loosely villous; heads in dense narrow panicles; bracts 
acutish. 
II. FILiro.tae 
Taller shrubs 3-10 dm. high, with numerous heads in leafy panicles; heads 
3-7 -flowered. 
Low undershrubs less than 1.5 dm. high, with racemose inflorescence; 
heads 10—15-flowered. 
Leaves ternate or biternate. 
Leaves pinnatifid with 5-7 divisions. 
Subgenus B. Absinthium 
III. FrRicmipAE 
Plant tall, 6-10 dm. high, erect; leaves twice or thrice pinnatifid. 
Plant lower, 2+ dm. high, often decumbent at base; leaves twice ternate. 
IV. LANATAE 
Basal leaves twice pinnatifid into several linear divisions; stem-leaves 
pinnate; heads 5-12. 
Basal leaves pinnatifid into 3-5 linear-oblanceolate approximate divisions; 
stem-leaves ternately cleft or entire; heads 1 
Subgenus C. Abrotanum 
V. ANNUAE 
Heads 2-3 mm. high and 2-4 mm. broad, in dense mostly axillary spikes. 
Heads 1.5 mm. high and 1.5-2.5 mm. broad, in lax racemes ending the 
branches, 
VI. KLorzscHIANAE 
One species. 
VII. GLOMERATAE 
Corollas more or less villous; leaves twice or thrice ternate; involucre 5-6 
mm. broad. 
Corollas glabrous or glandular-granuliferous; leaves simply ternate or 
quinate, rarely twice ternate. 
Plant densely long-hirsute; involucre 4-5 mm. broad. 
Plant sparingly silky; involucre 5-7 mm. broad. 
VIII. NorRvEGICAE 
Heads 6-10 mm. broad, usually more than 40-flowered: corollas hairy or 
rarely glabrous; bracts with fuscous margins (except in nos. 34 and 35). 
Plant more or less pubescent, at least on the leaves and peduncles. 
Plant canescent, low; basal leaves 6 cm. long or less, pinnatifid or 
bipinnatifid with few divisions. 
Plant hoary with rather loose pubescence. 
Plant silvery-silky with closely appressed pubescence. 
Involucral bracts with inconspicuous light-brown margins; 
plant less than 1 dm. high; leaves 1—-1.5 cm. long. 
Heads erect; involucre slightly tomentose, soon glabrous. 
Heads nodding; involucre densely tomentose. 
Involucral bracts with conspicuous dark-brown or blackish 
scarious margins; leaves 2-6 cm. long. 
Plant densely and finely silky; pubescence of the inflores- 
cence like that of the rest of the plant. 
Stems less than | dm. high; inflorescence a short, dense 
spike, somewhat interrupted below; bracts of the in- 
volucre broadly oval or obovate. 
Stems 2-3 dm. high; inflorescence an elongate leafy 
raceme; bracts of the involucre oblong. 
Plant rather sparingly silky; pubescence of the inflores- 
cence long and loose. 
Plant pee leaves twice pinnatifid, the basal ones more than 1 cm. 
ong. 
Leaf-segments ascending, all acute 
Inflorescence dense, spike-like, conspicuously pubescent 
with long white hairs on the peduncle and its branches; 
individual peduncles very short; plaut less than 1.5 dm. 
high. 
18. 
19. 
20. 
21. 
26. 
Bilke 
28. 
29. 
30. 
31. 
32. 
33. 
34. 
35. A 
36. 
37. 
38. 
247 
A, borealis. 
A. ripicola. 
A. pycnocephala. 
A. filifolia. 
. A. pedatifida. 
A. minula. 
. A. Absinthium. 
. A. frigida. 
. A. scopulorum, 
A. Pattersonii. 
A. biennis. 
A. annua. 
A. Klotzschiana. 
A glomerata. 
A. senjavinensis. 
A. globularia. 
A. Richardsoniana, 
A. minula, 
. lacomensis. 
A. hyperborea, 
A. Tyrrellii. 
A, heterophylla, 
39. A. comata, 
