1 |
Leaves pinnatisect, with ultimate lobules filiform, linear-filiform, filiform-clavate, narrowly lanceolate, or linear-lanceolate, (5-)10+ × 0.5-1(-1.5) mm, apex acute |
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(2) |
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Leaves pinnatipartite or pinnatisect, with ultimate lobules pectinate, serrate, or smoothly obtusely lacerate, less than 5(-8) × 1.5(-2) mm, or lobules minute but then lobes 1-2 mm wide with obtuse apex |
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(9) |
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2 (1) |
Herbs annual, biennial, or short-lived perennial; rootstock a simple taproot, sometimes ± fusiform |
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(3) |
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Herbs perennial, subshrubs, or shrubs; rootstock often branched, ± woody |
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(6) |
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3 (2) |
Herbs biennial or short-lived perennial; capitula obconical, 4-5 mm in diam. |
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52 A. fukudo |
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Herbs annual; capitula ovoid or subglobose, 2-3 mm in diam |
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(4) |
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4 (3) |
Middle stem leaves pinnatisect, segments 2(or 3) pairs; plants pubescent, ± glabrescent. |
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53 A. przewalskii |
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Middle stem leaves 2- or 3-pinnatisect, segments (2 or)3 or 4 pairs; plants glabrous or nearly so |
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(5) |
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5 (4) |
Stem branches short or absent; middle stem leaves (1 or)2-pinnatisect, segments (2 or)3 or 4 pairs; capitula 2-10 grouped, in narrow panicles. |
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46 A. palustris |
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Stem branches divaricate; middle stem leaves 2- or 3-pinnatisect, segments 4 or 5 pairs; capitula 2-5 grouped, in broad lax panicles. |
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47 A. aurata |
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6 (2) |
Middle stem leaves 2- or 3-pinnatisect, lobules narrowly linear, densely silvery gray or yellowish sericeous-tomentose; corolla limb puberulent. |
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49 A. austriaca |
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Middle stem leaves 1- or 2-pinnatisect, lobules linear, filiform, or filiform-clavate, pubescent or arachnoid pubescent, sometimes glabrescent later, or densely white tomentose abaxially; corolla limb glabrous |
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(7) |
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7 (6) |
Stem much branched; middle stem leaves 2-4 cm, 2(or 3)-pinnatisect; abaxial leaf surface and phyllaries densely white tomentose. |
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50 A. brachyloba |
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Stem shortly capitellate branched or not; middle stem leaves 0.8-2.5(-3) cm, 1- or 2-pinnatisect; leaves and phyllaries puberulent or leaves glabrescent |
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(8) |
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8 (7) |
Stem terete; lobules of middle stem leaves filiform, apex acute. |
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44 A. adamsii |
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Stem 4-ribbed; lobules of middle stem leaves filiform-clavate or linear-filiform, apex obtuse. |
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45 A. dalai-lamae |
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9 (1) |
Herbs annual or biennial; stem solitary, more than 20 cm; rootstock a simple taproot, sometimes ± fusiform |
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(10) |
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Herbs perennial or subshrubs; stems several or many, rarely solitary; roots usually woody, or herbs dwarf, less than 20 cm and with thick stock and ± fusiform root |
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(15) |
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10 (9) |
Leaves ± succulent, middle stem leaves 1- or 2-pinnatisect, segments 1 or 2 pairs, with obtuse apex, entire or 1-3-crenate or cleft. |
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51 A. succulenta |
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Leaves thinly papery, middle stem leaves 2- or 3-pinnatisect, segments 2 or more pairs, lobes or lobules acute or obtuse apically |
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(11) |
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11 (10) |
Basal leaves many, forming rosettes, segments more than 20 pairs; phyllaries with brown or purple-brown scarious margins; marginal female florets 3-8. |
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41 A. hedinii |
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Basal leaves not forming distinct rosettes, segments 3-8(-10) pairs; marginal female florets 10-12 |
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(12) |
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12 (11) |
Involucre 5-7 mm in diam.; phyllaries puberulent; disk florets 80-150; middle stem leaf segments 3 or 4 pairs, lobes serrate. |
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38 A. shangnanensis |
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Involucre 1.5-5(-7) mm in diam.; phyllaries glabrescent; disk florets 10-40; middle stem leaf segments 4-10 pairs, lobes pectinate |
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(13) |
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13 (12) |
Lower stem leaf petioles 2-6 cm; leaf blades minutely and lanceolately pectinate; synflorescence narrow and spikelike. |
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42 A. tournefortiana |
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Lower stem leaf petioles less than 2 cm; leaf blades pectinate; synflorescence broader, often a conical, compound panicle |
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(14) |
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14 (13) |
Middle stem leaves abaxially gray-yellowish or yellowish and gland-dotted; leaf rachis usually not pectinate, midvein obvious, slightly prominent; capitula 1.5-2.5 mm in diam. |
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40 A. annua |
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Middle stem leaves abaxially green, not gland-dotted; leaf rachis pectinate, midvein flat; capitula 3.5-5(-7) mm in diam. |
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39 A. caruifolia |
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15 (9) |
Herbs dwarf perennial, main root ± fusiform; stem usually less than 15 cm tall; leaves 1(or 2)-palmatisect, segments 1 or 2 pairs, without lobules or occasionally with 2 or 3 minute lobules; synflorescence spikelike. |
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48 A. caespitosa |
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Herbs perennial or subshrubs, roots woody; stem more than 15 cm tall; leaves 1(or 2)-pinnatisect, segments 3 or more pairs; synflorescence paniculate, racemelike, or spikelike |
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(16) |
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16 (15) |
Capitula broadly ovoid; phyllaries gray arachnoid pubescent; lobes of leaves suborbicularly and obtusely serrate. |
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31 A. baimaensis |
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Capitula hemispheric, globose, or subglobose; phyllaries puberulent, later glabrescent; lobes of leaves pectinate, or lobules lanceolate or linear-lanceolate, rarely linear-falcate |
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(17) |
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17 (16) |
Middle stem leaves 1- or 2-pinnatipartite, lobules pectinate |
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(18) |
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Middle stem leaves 2- or 3(or 4)-pinnatisect, lobules serrate |
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(19) |
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18 (17) |
Subshrubs; stem more than 70 cm; lobules of leaves elliptic or lanceolate and serrate; capitula 4-6 mm in diam. |
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32 A. medioxima |
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Herbs perennial; stem 20-70 cm; lobules of leaves pectinate; capitula 3-4 mm in diam. |
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35 A. latifolia |
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19 (17) |
Capitula hemispheric, rarely subglobose, 4-7 mm in diam., in racemes, spikes, or panicles |
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(20) |
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Capitula subglobose, 2.5-4 mm in diam., in panicles |
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(25) |
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20 (19) |
Herbs perennial; corolla limb puberulent |
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(21) |
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Subshrubs; corolla limb often glabrous |
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(22) |
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21 (20) |
Middle stem leaves pinnatisect, segments 5-7(or 8) pairs, lobes pectinate or deeply serrate; phyllaries with entire broad brown scarious margins. |
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36 A. phaeolepis |
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Middle stem leaves 2-pinnatisect or -partite, segments 4(or 5) pairs, lateral mid-lobes deeply 2-4-serrate; phyllaries with lacerate brown scarious margins. |
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43 A. tsugitakaensis |
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22 (20) |
Petioles of middle stem leaves 6-16 cm; leaves 1(or 2)-pinnatisect, lobes minutely irregularly pectinate-serrate. |
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34 A. maximovicziana |
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Petioles of middle stem leaves less than 3 cm; leaves 2 or 3(or 4)-pinnatisect, lobules minutely serrate |
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(23) |
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23 (22) |
Middle stem leaves ± sessile, 2(or 3)-pinnatisect, lobules minutely linear or linear-lanceolate or falcate, 0.5(-1) mm wide; capitula sessile or shortly pedunculate; phyllaries pubescent. |
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24 A. macrantha |
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Middle stem leaves petiolate, 2 or 3(or 4)-pinnatisect, lobules minute, pectinate, linear, elliptic, or ovate, (0.5-)1-1.5 mm wide; capitula pedunculate; phyllaries glabrescent or puberulent |
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(24) |
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24 (23) |
Middle stem leaves 3(or 4)-pinnatisect, segments 5-8 pairs, abaxial midvein obviously convex; peduncles 2-4 mm; phyllaries glabrescent. |
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26 A. polybotryoidea |
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Middle stem leaves 2(or 3)-pinnatisect, segments 3(or 4) pairs, abaxial midvein not convex; peduncles 4-15 mm; phyllaries puberulent. |
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27 A. aksaiensis |
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25 (19) |
Middle stem leaves with 6-8 pairs of segments, abaxially white tomentulose. |
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37 A. tanacetifolia |
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Middle stem leaves with 3-5 pairs of segments, abaxially pubescent or glabrescent |
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(26) |
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26 (25) |
Plants with short, woody vegetative shoots and slender, virgate synflorescences; petiole of middle stem leaves 0.3-0.5 cm; capitula with 16-20 disk florets. |
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33 A. freyniana |
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Plants much branched with most shoots fertile; petiole of middle stem leaves 0.8-5 cm; capitula usually with 20-60 disk florets (A. vestita with 12-20) |
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(27) |
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27 (26) |
Leaf blade 0.3-0.7 × 0.2-0.5 cm. |
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11 A. obtusiloba (see A. sect. Absinthium) |
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Leaf blade 2-10 × 0.7-8 cm |
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(28) |
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28 (27) |
Lobules of middle stem leaves entire, apex obtuse. |
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25 A. pontica |
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Lobules of middle stem leaves serrate or pectinate, apex acute |
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(29) |
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29 (28) |
Middle stem leaves abaxially yellow arachnoid pubescent, lobules linear or narrowly lanceolate; capitula with 40-60 disk florets. |
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29 A. stechmanniana |
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Middle stem leaves abaxially gray pubescent, often glabrescent, lobules serrate or pectinate; capitula with 12-40 disk florets |
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(30) |
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30 (29) |
Middle stem leaves triangular or elliptic-ovate in outline, lobules with triangular teeth; phyllaries puberulent or glabrescent; capitula with 20-40 disk florets. |
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28 A. gmelinii |
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Middle stem leaves ovate, elliptic-ovate, or suborbicular in outline, lobules deeply serrate; phyllaries densely pubescent; capitula with 12-20 disk florets. |
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30 A. vestita |
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