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| 1 |
Lowermost leaves 2-ternately 3-sect, middle stem leaves ternately 3-sect (3. S. sect. Juncea). |
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31 S. junceum |
| + |
Lowermost and middle stem leaves pinnatisect or pinnatipartite |
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(2) |
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| 2 (1) |
Leaves 2(or 3)-sect, lobules pectinate or narrowly serrate (2. S. sect. Minchunensia). |
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30 S. minchunense |
| + |
Leaves 1-3(or 4)-pinnatisect, lobules narrowly lanceolate or filiform or leaves entire or lobes with orbicular serrations (1. S. sect. Seriphidium) |
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(3) |
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| 3 (2) |
Leaves 1- or 2-pinnatipartite, lobes or lobules elliptic or ovate-elliptic, less than 5 mm, or leaves pinnatisect, lobes orbicular-serrate, or partly entire |
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(4) |
| + |
Leaves 1-3-pinnatisect, lobules 5-8 mm |
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(5) |
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| 4 (3) |
Middle stem leaves 1(or 2)-pinnatipartite, segments 3 or 4 pairs, lobes or lobules elliptic or ovate, occasionally margins 2- or 3-toothed. |
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8 S. scopiforme |
| + |
Middle stem leaves pinnatifid, segments 10(-15) pairs, orbicularly lobed or leaves linear and entire. |
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23 S. santolinum |
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| 5 (3) |
Stems caespitose, less than 25 cm tall; capitula densely spaced along branches forming short spicate or compound capitate synflorescences |
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(6) |
| + |
Branches long or short; capitula spreading on branches, in narrow or broad panicles |
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(11) |
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| 6 (5) |
Vegetative parts white tomentose; phyllaries densely gray tomentose. |
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25 S. rhodanthum |
| + |
Vegetative parts gray arachnoid tomentose or pubescent, or sometimes yellowish puberulent, sometimes partly glabrescent; phyllaries pubescent to densely arachnoid pubescent |
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(7) |
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| 7 (6) |
Phyllaries gland-dotted. |
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24 S. borotalense |
| + |
Phyllaries not gland-dotted |
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(8) |
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| 8 (7) |
Vegetative parts yellowish puberulent; leaf blade 0.5-0.8 cm. |
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27 S. grenardii |
| + |
Vegetative parts gray arachnoid tomentose or pubescent; leaf blade 1.5-3.5(-4) cm |
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(9) |
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| 9 (8) |
Stems much branched and caespitose; lowermost leaves 1- or 2-pinnatisect, or subpalmately 2- or 3-pinnatisect. |
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26 S. korovinii |
| + |
Stems less branched, not largely caespitose; lowermost leaves 2- or 3-pinnatisect |
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(10) |
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| 10 (9) |
Lowermost leaves ovate, 2- or 3-pinnatisect, segments (3 or)4 or 5(or 6) pairs, lobules 2-3(-4) mm, apex obtuse. |
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28 S. compactum |
| + |
Lowermost leaves suborbicular, (2 or)3-pinnatisect, segments (2 or)3 or 4 pairs, lobules 3-4 mm, apex acute. |
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29 S. lehmannianum |
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| 11 (5) |
Lowermost leaves 2- or 3-pinnatisect; middle stem leaves 1-3-pinnatisect |
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(12) |
| + |
Lowermost leaves 1- or 2-pinnatisect, middle stem leaves 1- or 2-pinnatisect |
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(20) |
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| 12 (11) |
Branches less than 3 cm; stem, branches, and leaves arachnoid pubescent, later glabrescent; middle stem leaves with 2-5 pairs of segments; capitula in narrow panicles |
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(13) |
| + |
Branches more than (3-)5 cm; stem, branches, and leaves arachnoid tomentose or pubescent, or lower parts pubescent; middle stem leaves with 4-6 pairs of segments; capitula in broad or narrow and elongated panicles |
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(14) |
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| 13 (12) |
Stems laxly caespitose; stem and branches arachnoid pubescent or glabrescent; middle stem leaves with (3 or)4 or 5 pairs of segments, not gland-dotted; phyllaries convex. |
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6 S. karatavicum |
| + |
Stems densely caespitose; stem and branches pubescent, later glabrescent; middle stem leaves with 2 or 3 pairs of segments, gland-dotted; phyllaries keeled. |
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17 S. gracilescens |
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| 14 (12) |
Lower and middle stem leaves less than 2.5 cm; branches spreading |
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(15) |
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Lower and middle stem leaves more than 2.5 cm; branches ascending |
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(16) |
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| 15 (14) |
Synflorescence a narrow or somewhat broad panicle; capitula usually in groups of 2 or 3 along branchlets, ovoid-oblong or ellipsoid, ca. 2 mm in diam. |
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13 S. brevifolium |
| + |
Synflorescence a broad, much-branched panicle; capitula solitary, subglobose, 2.5-3 mm in diam. |
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14 S. thomsonianum |
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| 16 (14) |
Stem arachnoid tomentose; lower leaves broadly ovate or ovate-oblong, middle stem leaf lobules 2-4 mm. |
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1 S. schrenkianum |
| + |
Stem densely tomentose or pubescent, later partly glabrescent; lower leaves elliptic-ovate or ovate-oblong, middle stem leaf lobules more than 5 mm |
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(17) |
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| 17 (16) |
Stem, branches, leaves, and phyllaries arachnoid tomentose or pubescent, but stem and phyllaries glabrescent at anthesis; branches more and spreading; capitula ellipsoid or oblong, in broad or somewhat broad panicles. |
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5 S. mongolorum |
| + |
Stem, branches, leaves, and phyllaries arachnoid pubescent or tomentose, hairs present or glabrescent in lower stem at anthesis; branches from middle to above on stem; capitula oblong, oblong-ovoid, or ovoid, in somewhat broad, elongated, or narrow panicles |
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(18) |
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| 18 (17) |
Middle stem leaves (1 or)2-pinnatisect, lobules 1-1.5 mm wide; capitula 2-2.5 mm in diam., in narrow or somewhat broad panicles. |
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4 S. finitum |
| + |
Middle stem leaves 2- or 3-pinnatisect, lobules 0.5-1mm wide; capitula 1-2 mm in diam., at upper part of stem in somewhat broad panicles |
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(19) |
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| 19 (18) |
Rootstock thick, lower bark peeling; middle stem leaves pinnatisect, segments 4 or 5 pairs; phyllaries strongly convex. |
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2 S. transiliense |
| + |
Root solitary, lower bark not peeling; middle stem leaves (2 or)3-pinnatisect, segments 5 or 6 pairs; phyllaries ± flat. |
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7 S. sawanense |
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| 20 (11) |
Capitula 2-2.5 mm; branches from middle part of stem, spreading, 10-15 cm; panicles broad, conical. |
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16 S. ferganense |
| + |
Capitula less than 3 mm in diam.; branches from upper part of stem, less than 10 cm, or if from lower stem then short or more than 10 cm; panicles broad or narrow |
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(21) |
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| 21 (20) |
Middle stem leaves pinnatisect, segments 1 or 2(or 3) pairs; phyllaries and florets deciduous after anthesis. |
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9 S. kaschgaricum |
| + |
Middle stem leaves 1-pinnatisect, or 2-pinnatisect and then with segments (2 or)3-5; phyllaries and florets persistent after anthesis |
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(22) |
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| 22 (21) |
Stems many and thickly caespitose, branches 2-3(-5) cm, ascending; lobes and lobules of leaves deciduous or nearly deciduous |
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(23) |
| + |
Stems few or several, not thickly caespitose; branches more than (3-)5 cm; lobes or lobules not deciduous |
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(27) |
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| 23 (22) |
Branches from middle part of stem, ascending; leaves persistent after anthesis; middle stem leaves with 3 or 4 pairs of segments, lobes or lobules needlelike, more than 3 mm, central lobes 4-12 mm |
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(24) |
| + |
Branches from upper part of stem, spreading or ascending; leaves deciduous or semideciduous after anthesis; middle stem leaves with 2-5 pairs of segments, central lobes 2-3 mm |
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(25) |
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| 24 (23) |
Stem 30-45 cm tall, branches 2-4(-5) cm; lowermost leaves 2-pinnatisect, middle stem leaves 1- or 2-pinnatisect; capitula in narrow or somewhat broad panicles. |
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21 S. sublessingianum |
| + |
Stem 5-25(-35) cm tall, branches 1-2(-3) cm; lower leaves 1(or 2)-pinnatisect, middle stem leaves 1(or 2)-pinnatisect; capitula in narrow, spikelike panicles. |
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22 S. amoenum |
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| 25 (23) |
Stem, branches, and leaves densely tomentose or pubescent; leaves with (3 or)4 or 5 pairs of segments, semideciduous after anthesis; capitula in dense narrow pyramidal panicles. |
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19 S. semiaridum |
| + |
Stem, branches, and leaves densely arachnoid tomentose or pubescent; leaves with 3 or 4(or 5) pairs of segments, deciduous after anthesis; capitula in loose somewhat broad panicles on upper stem |
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(26) |
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| 26 (25) |
Branches from upper stem, 2-3(-5) cm; lower leaves ovate, 1-2(-3) × 0.8-1 cm; capitula in loose somewhat broad panicles. |
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18 S. terrae-albae |
| + |
Branches from upper stem, 5-8 cm; lower leaves ovate- oblong or elliptic-ovate, 2-2.5 × 1-1.5 cm; capitula in somewhat broad and elongated panicles. |
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20 S. heptapotamicum |
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| 27 (22) |
Branches ascending from upper part of stem; middle stem leaves with (3 or)4 or 5 pairs of segments |
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(28) |
| + |
Branches ascending or spreading from middle or lower parts of stem; middle stem leaves with (2 or)3 or 4 pairs of segments |
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(29) |
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| 28 (27) |
Stem, branches, leaves, and phyllaries gray puberulent or glabrescent; capitula in groups of 3-5 along branches. |
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15 S. aucheri |
| + |
Stem, branches, leaves, and phyllaries arachnoid pubescent, later partly glabrescent; capitula uniformly distributed along branches. |
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3 S. nitrosum |
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| 29 (27) |
Lowermost leaves 3-6 × 1.5-4.5 cm; capitula in dense narrow panicles. |
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12 S. cinum |
| + |
Lowermost leaves 1-3 × 0.5-2(-2.5) mm; capitula in sparse narrow panicles |
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(30) |
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| 30 (29) |
Branches spreading from lower stem; capitula in somewhat broad or narrow panicles. |
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11 S. issykkulense |
| + |
Branches ascending from middle of stem; capitula in narrow elongated panicles. |
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10 S. fedtschenkoanum |
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