248 NORTH AMERICAN FLORA 
Inflorescence open, slightly pubescent; branches or indi- 
vidual peduncles, at least the lower ones, elongate. 
Leaves and stem decidedly hairy; inner bracts ovate, 
acute, with a narrowly lanceolate green center. 
Leaves sparingly pubescent or glabrate; stem glabrous or 
nearly so; inner bracts obovate, obtuse or rarely acutish, 
with a broadly lanceolate green center. 
Leaf-segments spreading, those of the lower leaves obtuse. 
Plant glabrous. 
Heads 5-6 mm. broad, 30-40-flowered; corollas glandular-granuliferous; 
plant glabrous; bracts with light-brown margins. 
Leaf-segments linear, obtuse or acute. 
Leaf-segments linear-lanceolate, acuminate or attenuate. 
IX. FRANSERIOIDES 
One species 
X. VULGARES 
Leaf-segments again divided or lobed. 
Inflorescence much branched, pyramidal; heads very numerous; in- 
volucre campanulate, 4 mm. high, 10—30-flowered. 
Primary segments of the lower leaves obovate in outline, again 
lobed. 
Primary segments of the lower leaves narrowly lanceolate, entire or 
with a few coarse teeth. 
Inflorescence narrow, cylindric; heads fewer; involucre hemispheric. 
Heads 3 mm. high, 25—35-flowered; leaf-segments lanceolate, short, 
acute. 
Heads about 5 mm. high and broad, usually 35—50-flowered; leaf- 
segments attenuate or acuminate. 
Leaf-segments lanceolate, acuminate. 
Leaf-segments lance-linear, attenuate. 
Leaves or their segments entire or nearly so. 
Heads not very numerous, comparatively large, 25—50-flowered; in- 
volucre hemispheric. 
Inflorescence spike-like. 
Suffruticose with a woody base; leaves coarse toothed. 
Herbaceous with a rootstock; leaves deeply lobed. 
Inflorescence open-paniculate. 
ves lanceolate, thin, deeply lobed; involucre glabrous or 
nearly so. 
Lobes of the leaves lanceolate, entire. 
Lobes of the leaves linear-lanceolate, again cleft with narrow 
lobes. 
Leaves linear-lanceolate, entire or short-lobed, thicker, sparingly 
floccose above; involucre arachnoid. 
Heads very numerous, in dense compound panicles (except in A. Lind- 
leyana), 5—25-flowered; involucre campanulate or ellipsoid. 
Leaves not finely serrate. 
Upper leaves lanceolate or oblanceolate, usually more than 
4 mm. wide. 
Involucre 4 mm. high; leaves large, 5-15 cm. long, lanceolate 
or ovate-lanceolate in outline, with very few divisions. 
Lower leaves deeply divided into more or less falcate 
divisions. 
Lower leaves with shorter lobes or teeth directed forward. 
Head nodding in anthesis, 15—25-flowered; involucre 
rounded-campanulate, rather permanently tomen- 
tose. 
Heads erect in anthesis, 5-15-flowered; involucre 
oblong or subcylindric. 
Involucral bracts densely tomentose. 
Involucral bracts glabrate and shining. 
Involucre 3 mm. high; leaves shorter; lobes of the lower 
leaves often spreading. 
Leaves of a lanceolate type; involucre campanulate, 
usually less than 3 mm. broad. 
Leaves mostly entire, conspicuously veined beneath. 
Leaves or at least most of them somewhat lobed or 
toothed, not strongly veined beneath. 
Plant about 1 m. high; lower leaves dissected to 
near the midrib. 
Plant 3-6 dm. high; lower leaves cleft or lobed. 
Leaves granuliferous above; inflorescence dense, 
with almost erect branches. 
Leaves not granuliferous above; inflorescence 
open, with ascending branches. 
saraled of a cuneate type; involucre hemispheric, 3+ mm. 
road. 
47. 
48. 
34. 
55. 
56. 
oe 
58. 
59. 
66. 
48. 
60. 
61. 
[VoLuME 34 
. A. saxicola. 
. A. arctica. 
. A. macrobotrys. 
. A. laevigata. 
. A. Parryt. 
. A. Cooleyae. 
. A. franserioides. 
A. vulgaris. 
A. selengensis. 
. A. incompta. 
. A. unalaskensis. 
. A. Gormaniti. 
A. Leibergit. 
. A. Tilestt. 
. A. elatior. 
A. Gormanii. 
A. arachnoidea. 
A. Hookeriana. 
A. Douglasiana. 
A. Herriotii. 
A. Suksdorfit. 
A. Muelleri. 
A. selengensis. 
A. atomifera. 
A. ludoviciana. 
