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| 1 |
Leaves entire, linear, linear-lanceolate, elliptic-lanceolate, or lanceolate, occasionally some with 1(or 2) lateral lobes or apex 3-cleft. |
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135 A. dracunculus |
| + |
Leaves 1-3(or 4)-pinnatisect, lobules narrowly linear |
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(2) |
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| 2 (1) |
Capitula (2.5-)3-6 mm in diam., or if 2.5-3 mm in diam. then plants shrubs or subshrubs, middle stem leaf lobules stiff, 1.5-3 mm wide |
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(3) |
| + |
Capitula 1-2.5(-3) in diam.; middle stem leaf lobules narrowly linear or filiform, 0.5-1.5(-2) mm wide; or if capitula 2-2.5(-3) mm in diam. then plants herbaceous, lobules of leaves thin, 0.5-1 mm wide |
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(12) |
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| 3 (2) |
Plants more than 60 cm tall; involucres (3-)4-6 mm in diam., if less than 4 mm then involucres ovoid, lobules of middle stem leaves filiform or linear, 20-30 × 1.5-2.5 mm, or lobules falcate |
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(4) |
| + |
Plants to 20-50(-60) cm tall; capitula (2.5-)3(-4) mm in diam., or if more than 4 mm then capitula globose and lobules in middle stem leaves linear to filiform, 5-10 × 0.5-1 mm, or leaves palmately 5-7-partite |
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(7) |
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| 4 (3) |
Subshrubs, shortly capitate branched; lowermost and middle stem leaves less than 1 cm wide, pinnatisect, segments 1 or 2 pairs; capitula in spicate-racemose or narrow panicles; capitula 5-6 mm in diam. |
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139 A. kangmarensis |
| + |
Shrubs, much branched; middle stem leaves (1 or)2-pinnatisect, segments 2 or 3 pairs, or 4 pairs and then leaves ovate or broadly ovate, more than 1 cm wide; capitula in broad or narrow panicles; capitula (2.5-)3-5 mm in diam |
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(5) |
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| 5 (4) |
Capitula ovoid, erect, in broad and branched or somewhat broad panicles; stem purple; lower leaves with 3-5 pairs of segments, middle leaves with (2 or)3 or 4 pairs of segments. |
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138 A. halodendron |
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Capitula globose or subglobose, nodding, in broad or narrow panicles; stem gray, brown or yellowish; lower leaves with 2-4 pairs of segments, middle leaves with 2 or 3(or 4) pairs |
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(6) |
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| 6 (5) |
Middle stem leaves (5-)6-8 × 3-4 cm, segments 2 or 3(or 4) pairs, lobules narrowly linear, straight; capitula in narrow or somewhat broad panicles; stem gray. |
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137 A. wudanica |
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Middle stem leaves 2-5(-8) × 1.5-3(-4) cm, segments (1 or)2 or 3 pairs, lobules linear or falcate; capitula in lax and broad panicles; stem yellowish. |
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136 A. sphaerocephala |
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| 7 (3) |
Stem unbranched or few and shortly capitate branched, pubescent; leaves palmately 5-7-partite, sericeous-pubescent on both surfaces; capitula in narrow panicles; phyllaries pubescent. |
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155 A. kuschakewiczii |
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Stem branched, pubescent or glabrescent; leaves 1 or 2(or 3)-pinnatisect; capitula in broad or narrow panicles; phyllaries pubescent or glabrescent |
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(8) |
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| 8 (7) |
Lowermost and middle stem leaves 2(or 3)-pinnatisect, lobules 0.5-0.8 mm wide; capitula hemispheric, pedunculate, in narrow racemelike panicles. |
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165 A. oligocarpa |
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Lowermost and middle stem leaves 1- or 2-pinnatisect, lobules 1-2.5 mm wide; capitula not hemispheric, if pedunculate then leaf lobes falcate; capitula in broad or narrow panicles |
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(9) |
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| 9 (8) |
Stem less than 30 cm tall; leaflike bracts 2-3 × capitula and longer than fertile branches; synflorescence a narrow panicle |
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(10) |
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Stem 30-60 cm tall; leaflike bracts longer than capitula but shorter than fertile branches; synflorescence a broad panicle |
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(11) |
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| 10 (9) |
Middle stem leaves 1-2 × 0.5-1.5 cm, pinnatisect, midvein flat. |
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150 A. wellbyi |
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Middle stem leaves 3.5-4.5 × 2-3 cm, 2-pinnatisect, midvein abaxially prominent, white. |
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152 A. gyangzeensis |
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| 11 (9) |
Lateral lobes of middle stem leaves linear, linear-lanceolate, or falcate-lanceolate, 1.5-2.5 mm wide. |
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151 A. waltonii |
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Lateral lobes of middle stem leaves narrowly linear or filiform, straight, 1-1.5 mm wide. |
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142 A. prattii |
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| 12 (2) |
Shrubs or caespitose subshrubs, with strong woody stock; lobules of middle stem leaves narrowly linear or filiform, 0.5-1.5(-2) mm wide; growing in arid areas |
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(13) |
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Perennial, annual, or biennial herbs, root solitary, or nearly subshrubs but not caespitose and lobules of leaves thin and soft, other lobules narrowly linear, filiform, or linear-lanceolate, less than 1 mm wide; not growing in arid areas |
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(23) |
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| 13 (12) |
Lower branches more than 12 cm, upper branches more than 5 cm; capitula in broad panicles |
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(14) |
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Lower branches 4-10 cm, upper branches 3-5 cm; capitula in narrow or somewhat broad panicles |
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(18) |
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| 14 (13) |
Petiole in middle stem leaves 2-3(-4.5) cm; capitula subglobose. |
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143 A. klementzae |
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Leaves sessile or petioles less than 1.5 cm in middle stem leaves; capitula ovoid or ovoid-ellipsoid |
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(15) |
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| 15 (14) |
Middle stem leaves pinnatisect, lobes 0.5-1 mm, rarely mixed 1- or 2-lobuled at basal or middle lobes. |
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141 A. ordosica |
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Middle stem leaves (1 or)2-pinnatisect, 3-lobuled at basal and middle lobes, lobes or lobules 1.5-2 mm |
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(16) |
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| 16 (15) |
Branches many, nearly horizontal; lobule apex obtuse, mucronulate. |
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140 A. songarica |
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Branches ascending; lobule apex acute |
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(17) |
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| 17 (16) |
Bark usually deciduous; lobules 15-20 × 1.5-2 mm. |
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146 A. oxycephala |
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Bark persistent; lobules 4-10 × (0.5-)1-1.5 mm. |
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147 A. campestris |
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| 18 (13) |
Lower and middle stem leaves pinnatisect, segments of lowermost leaves 2 or 3 pairs, segments of middle leaves 1 or 2 pairs |
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(19) |
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Lowermost and middle stem leaves 2(or 3)-pinnatisect, segments of lowermost leaves 4 or 5 pairs |
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(21) |
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| 19 (18) |
Ultimate lobules of leaves 1.5-2.5 mm wide; involucre 2-2.5 mm in diam. |
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145 A. xanthochroa |
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Ultimate lobules of leaves 0.5-1.5 mm; involucre 2-2.5(-3) mm in diam |
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(20) |
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| 20 (19) |
Involucre semi-globose or subglobose, 2.5(-3) mm in diam.; disk florets 5-10. |
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154 A. nortonii |
| + |
Involucre ovoid-oblong or ellipsoid, 2-2.5 mm in diam.; disk florets 4-6. |
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149 A. saposhnikovii |
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| 21 (18) |
Middle stem leaf segments 3 or 4(or 5) pairs; synflorescence a broad, conical panicle. |
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148 A. marschalliana |
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Middle stem leaf segments 2 or 3 pairs; synflorescence a narrow, cylindric panicle |
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(22) |
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| 22 (21) |
Lowermost and middle stem leaves 1.5-2.5 × 1-1.5 cm, lowermost 1- or 2-pinnatisect, segments 2-5 pairs; capitula 1.5-2.5 mm in diam., in narrow panicles. |
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153 A. xigazeensis |
| + |
Lowermost and middle stem leaves less than 1 × 1 cm, 2-pinnatisect, segments 2 pairs; capitula 1-1.5 mm in diam., in somewhat broad or narrow panicles. |
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144 A. globosoides |
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| 23 (12) |
Annual, biennial, or perennial herbs, root solitary, narrowly fusiform; lobules of middle stem leaves soft and thin, narrowly linear-filiform or narrowly linear-lanceolate,. 2-0.5(-1) mm wide |
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(24) |
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Perennial herbs, or nearly subshrubs, roots several, rarely solitary, but not narrowly fusiform; lobules in middle stem leaves narrowly linear, more than (0.5-)1 mm wide |
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(28) |
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| 24 (23) |
Segments of middle stem leaves 5-8 pairs; phyllaries gray puberulent. |
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169 A. blepharolepis |
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Segments of middle stem leaves (1 or)2-4 pairs; phyllaries often glabrous or glabrescent |
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(25) |
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| 25 (24) |
Middle stem leaves 2-pinnatisect, segments (3 or)4 pairs; capitula densely spicate on branches and in narrow or somewhat broad panicles. |
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167 A. stricta |
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Middle stem leaves 1- or 2-pinnatisect, segments (1 or)2 or 3 pairs; capitula spreading on branches and in broad paniculate or spicate-panicles |
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(26) |
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| 26 (25) |
Plants less than 20 cm tall, branched from base of stem, and usually procumbent; middle stem leaves pinnatisect; capitula in spicate panicles. |
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160 A. demissa |
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Plants more than 20 cm tall, branched from middle or basally on stem; middle stem leaves 2-pinnatisect; capitula in broad panicles |
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(27) |
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| 27 (26) |
Middle stem leaves gray or yellowish sericeous-pubescent, later glabrescent; capitula 1.5-2 mm in diam., sessile or shortly pedunculate, in broad panicles. |
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166 A. scoparia |
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Middle stem leaves persistent pubescent; capitula 1-1.5 mm in diam., shortly pedunculate, in much-branched panicles. |
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168 A. pewzowii |
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| 28 (23) |
Plants less and shorter branched; capitula in narrow panicles. |
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161 A. macilenta |
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Plants more and long branched; capitula in broad or somewhat broad, rarely narrow, panicles |
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(29) |
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| 29 (28) |
Capitula 1-1.5(-2) mm in diam., spreading apically on branches or branchlets and in broad and elongated panicles |
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(30) |
| + |
Capitula 1.5-2 mm in diam., spreading on whole branches or branchlets |
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(31) |
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| 30 (29) |
Basal and lowermost leaves 7-8 × 5-7.5 cm, 2- or 3-pinnatisect or -partite, lobules 10-20 × 2-4 mm; phyllaries revolute at apex. |
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162 A. chienshanica |
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Basal and lowermost leaves 2-4(-5) × 1.5-3.5 cm, 2(or 3)-pinnatisect, lobules 5-10 × 0.5-1.5(-2) mm; phyllaries erect at apex. |
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163 A. capillaris |
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| 31 (29) |
Middle stem leaves 1(or 2)-pinnatisect, segments 1 or 2(or 3) pairs, lobules narrowly linear; capitula several, in narrow or somewhat broad panicles |
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(32) |
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Middle stem leaves 1-pinnatisect, or 2-pinnatisect and then lobes or lobules linear-lanceolate or nearly subulate, segments in middle stem leaves (2 or)3 pairs; capitula in broad or somewhat broad, rarely narrow, panicles |
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(33) |
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| 32 (31) |
Middle stem leaves 3-3.5 × 3-4 cm, lobes (10-)20-30 × 1-2 mm; capitula in narrow panicles. |
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164 A. morrisonensis |
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Middle stem leaves 1.5-2.5 × 1.5-2.5 cm, lobes 3-5 × 0.5-1 mm; capitula in somewhat broad panicles. |
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159 A. gansuensis |
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| 33 (31) |
Branches and leaves gray pubescent, later glabrescent; lobules of leaves narrowly linear or narrowly linear-lanceolate. |
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158 A. pubescens |
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Branches and leaves persistent gray or yellowish pubescent; lobules of leaves linear-lanceolate or narrowly linear-subulate or subulate |
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(34) |
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| 34 (33) |
Branches and leaves densely gray pubescent; lobules of leaves linear-lanceolate. |
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156 A. forrestii |
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Branches and leaves densely yellowish pubescent; lobules of leaves narrowly linear-lanceolate or subulate. |
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157 A. mairei |
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