Parr 3, 1916] CARDUACEAE: ANTHEMIDEAE 
Leaves with 3-5 ovate teeth at the apex, dark-green. 
Leaves with 3-7 lanceolate lobes, yellowish-green. 
Upper leaves linear or narrowly linear-oblanceolate, less than 
4 mm. wide (except sometimes in A. Muelleri). 
Heads numerous, panicled; leaves usually more than 5 cm. 
long; plant not suffruticose. 
Leaves not revolute; head more or less nodding. 
Inflorescence loose; branches long and heads scattered. 
Involucre shining, almost glabrous; stem yellowish- 
green, glabrous or nearly so, strongly grooved. 
Involucre decidedly tomentose, dull; stem more or 
less tomentose, if glabrate not strongly 
grooved. 
Involucre about 3 mm. high. 
Involucre campanulate, about 2 mm. broad; 
lower leaves pinnatifid, the upper entire. 
Involucre hemispheric, 2.5—4 mm. broad. 
Stem-leaves or some of them 3- (rarely 5-) 
cleft, with long lateral lobes, not 
strongly veined beneath. 
Stem-leaves mostly entire or rarely short- 
lobed, strongly veined beneath. 
Involucre 4-5 mm. high and wide. 
Leaves entire or the lower coarsely toothed or 
with short lanceolate lobes. 
Leaves, at least some of them, with long 
narrow lobes. 
Lobes of the leaves several, alternate, 
salient, falcate. 
Lobes of the leaves 2 or 3 above the 
middle, not falcate. 
Inflorescence dense and narrow; branches short; heads 
crowded; stem-leaves mostly pinnatifid. 
Bracts and upper surface of the leaves nearly 
glabrous; lower surface minutely tomentulose. 
Bracts and upper surface of the leaves tomentulose; 
lower surface white-tomentose. 
Leaves or their divisions revolute-margined; heads erect. 
Heads less numerous, in narrow spikes or spike-like panicles; 
leaves narrow, usually less than 5 cm. long, the lower 
toothed or rarely lobed towards the apex, the upper entire, 
linear or nearly so; plant suffruticose at the base. 
Leaves finely serrate throughout. 
XI. GNAPHALODES 
Leaves all entire or the basal ones merely toothed. 
Involucre 3-4 mm. high, 2-3.5 mm. broad; heads less than 25-flowered. 
Inflorescence open, with spreading branches; leaves thin, silky. 
(Tomentose form of) 
Inflorescence dense, with ascending or erect branches; leaves 
thicker with looser tomentum. 
Corollas dark-brown or purplish; leaves usually less tomentose 
above, the lower serrate towards the apex. 
Corollas light-brown or yellow; leaves equally white-tomentose 
on both sides. 
Involucre 2—2.5 mm. broad; leaves very narrow, linear or 
lance-linear, acute. 
Involucre 2.5-3.5 mm. broad; leaves broader, if lance-linear, 
more or less acuminate. 
Upper leaves ovate to lanceolate, acute; heads densely 
crowded and usually erect. 
Upper leaves lanceolate to lance-linear, acuminate; heads 
less crowded, mostly spreading. (Entire-leaved forms 
of) 
Involucre 4-5 mm. high, 4-7 mm. broad; heads 25-40-flowered (in 
A. longifolia sometimes 20-25-flowered). 
Heads nodding or spreading; leaves equally floccose on both sides, 
not revolute, acute. 
Heads nodding, rather long-peduncled on elongate racemiform 
branches; leaves linear. 
Heads spreading, subsessile or short-peduncled on shorter 
branches; stem-leaves lanceolate. 
Heads erect, peduncled; stem-leaves linear-lanceolate, caudate- 
attenuate, often revolute-margined and greener above. 
Leaves, at least the lower ones, more or less lobed or divided. 
er leaves with simple divisions mostly directed forward. 
Lower leaves with oblong obtuse lobes. 
Lower leaves with acute or acuminate lobes. 
62. 
86. 
63. 
64. 
65. 
66. 
67. 
68. 
69. 
70. 
ile 
72. 
73. 
74. 
65. 
ad 
76. 
77. 
83. 
78. 
79. 
80. 
A. cuneala. 
A. rhizomata. 
A, sulcata. 
A. Lindheimeriana. 
A, mexicana. 
A. Muelleri. 
A. silvicola, 
A. falcata. 
A. Ghiesbreghtii. 
A. potens. 
A. Underwoodii. 
A, revoluta. 
A. Lindleyana. 
A. serrata. 
A, mexicana. 
A. gnaphalodes. 
A. pabularis. 
A. Purshiana. 
A. diversifolia. 
A. pudica. 
A. argophylla. 
A. longifolia. 
81. A. obtusa. 
