9. Tribe ANTHEMIDEAE

738
ANTHEMIDEAE
ulate, or globose, heterogamous, disciform. Phyllaries in (3 or)4–6(or 7) series, densely pubescent or arachnoid pubescent. Bisexual
florets (1–)3–12(–20); anther appendages linear or linear-lanceolate. Achenes ovoid or obovoid, subcompressed.
About 100 species: arid regions of C, S, and SW Asia (including Arabian peninsula), N Africa, Europe; 31 species (six endemic) in China.
Some species contain flavonoids and santonin; some are used for medicine.
Molecular data (Watson et al., BMC Evolutionary Biology; http://www.biomedcentral.com/1471-2148/2/17/; accessed 10 Apr 2011) show that
the Old World members of Seriphidium s.s. form a well-defined monophyletic group embedded within Old World Artemisia s.l. The New World
members (A. sect. Tridentatae L. M. Schultz) formed a polyphyletic group distributed among New World species of Artemisia and are here excluded
from Seriphidium s.s.
1a. Lowermost leaves 2-ternately 3-sect, middle stem leaves ternately 3-sect (3. S. sect. Juncea) .................................. 31. S. junceum
1b. Lowermost and middle stem leaves pinnatisect or pinnatipartite.
2a. Leaves 2(or 3)-sect, lobules pectinate or narrowly serrate (2. S. sect. Minchunensia) ................................. 30. S. minchunense
2b. Leaves 1–3(or 4)-pinnatisect, lobules narrowly lanceolate or filiform or leaves entire or lobes with
orbicular serrations (1. S. sect. Seriphidium).
3a. 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.
4a. Middle stem leaves 1(or 2)-pinnatipartite, segments 3 or 4 pairs, lobes or lobules elliptic or ovate,
occasionally margins 2- or 3-toothed ..................................................................................................... 8. S. scopiforme
4b. Middle stem leaves pinnatifid, segments 10(–15) pairs, orbicularly lobed or leaves linear and
entire ..................................................................................................................................................... 23. S. santolinum
3b. Leaves 1–3-pinnatisect, lobules 5–8 mm.
5a. Stems caespitose, less than 25 cm tall; capitula densely spaced along branches forming short
spicate or compound capitate synflorescences.
6a. Vegetative parts white tomentose; phyllaries densely gray tomentose ....................................... 25. S. rhodanthum
6b. Vegetative parts gray arachnoid tomentose or pubescent, or sometimes yellowish puberulent,
sometimes partly glabrescent; phyllaries pubescent to densely arachnoid pubescent.
7a. Phyllaries gland-dotted .......................................................................................................... 24. S. borotalense
7b. Phyllaries not gland-dotted.
8a. Vegetative parts yellowish puberulent; leaf blade 0.5–0.8 cm ........................................... 27. S. grenardii
8b. Vegetative parts gray arachnoid tomentose or pubescent; leaf blade 1.5–3.5(–4) cm.
9a. Stems much branched and caespitose; lowermost leaves 1- or 2-pinnatisect, or
subpalmately 2- or 3-pinnatisect .................................................................................... 26. S. korovinii
9b. Stems less branched, not largely caespitose; lowermost leaves 2- or 3-pinnatisect.
10a. Lowermost leaves ovate, 2- or 3-pinnatisect, segments (3 or)4 or 5(or 6)
pairs, lobules 2–3(–4) mm, apex obtuse .......................................................... 28. S. compactum
10b. Lowermost leaves suborbicular, (2 or)3-pinnatisect, segments (2 or)3
or 4 pairs, lobules 3–4 mm, apex acute ...................................................... 29. S. lehmannianum
5b. Branches long or short; capitula spreading on branches, in narrow or broad panicles.
11a. Lowermost leaves 2- or 3-pinnatisect; middle stem leaves 1–3-pinnatisect.
12a. 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.
13a. 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 ...................................................................................................... 6. S. karatavicum
13b. Stems densely caespitose; stem and branches pubescent, later glabrescent;
middle stem leaves with 2 or 3 pairs of segments, gland-dotted; phyllaries
keeled ...................................................................................................................... 17. S. gracilescens
12b. 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.
14a. Lower and middle stem leaves less than 2.5 cm; branches spreading.
15a. 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. ............................................................................................................ 13. S. brevifolium
15b. Synflorescence a broad, much-branched panicle; capitula solitary,
subglobose, 2.5–3 mm in diam. ................................................................ 14. S. thomsonianum