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Published In: Species Plantarum 2: 845. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library
 

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
Synonym Text: Oligosporus Cass. in Bull. Soc. Philom. 33: 1817.
General/Distribution: A genus of c. 388 species (K. Bremer & Humphries, 1993), distributed mainly in north temperate regions of both the new and old world, extreme north and south Africa and south America; conspicuous by its absence in Australia. Represented in Pakistan by 25 species in arid and semi-arid areas of Balochistan, NWFP, northern Punjab, and Kashmir forming an important component of Artemisia steppes.

 

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Annual, biennial or perennial, usually bitter-aromatic or non-aromatic, glabrous, hairy or punctate-glandulose herbs or small to large shrubs with tap root or horizontal rootstock. Leaves alternate, basal large and petiolate, upper often subsessile to sessile, undivided or toothed-shallowly to deeply incised or lobed, palmati- or pinnatipartite or 2-4-pinnatisect. Synflorescence a panicle, sometimes racemoid or spicate, occasionally globoid or fascicled. Capitula generally numerous, small, rarely mediocre, nodding or erect, oblong-cylindrical or ovate to almost globose, heterogamous. Involucre ovoid to campanulate or hemispherical; phyllaries in 2-4 (-6)-series, imbricate, hairy or glabrous, inner ones mostly scarious-margined or scarious. Receptacle plane, convex, conical or hemispherical, glabrous or pilose. Flowers brownish, reddish or yellowish, all tubular. Ray-florets: pistillate and fertile; corolla narrowly tubular, generally tapering upwards, 2-3 (-4)-toothed, ± oblique, eligulate; style exserted, 2-cleft, branches recurved, linear-filiform and terete-oblong, ± flattened. Disc-florets bisexual, fertile or sterile; corolla tubular to ± campanulate or funnel-shaped, 5-toothed; anthers oblong, longer than the filaments, obtuse or ± cordate at the base, apical appendages lanceolate or subulate; style exserted or included, either 2-cleft with flat, truncate and apically erose or fimbriate, ± recurved branches or columnar with an erose or fimbriate disc or cup at the apex. Cypselas of both marginal and discs (when fertile) terete, oblong-ellipsoid or obovoid to nearly fusiform-prismatic, faintly many-striate or smooth, glabrous, apically rounded or truncate. Pappus absent or sometimes cypselas with a minute annulus or scarious corolliform ring.
 

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1 Leaves simple, undivided, entire or serrate. (2)
+ Leaves shallowly to deeply, 1-3 times divided. (3)
2 (1) Leaves without serrations, glabrous on both sides. 2 Artemisia dracunculus
+ Leaves serrate with incurved gland tipped teeth, glabrous above, glandular hairy beneath. 13 Artemisia amygdalina
3 (1) Disc-florets functionally male, with rudimentary ovaries; styles shorter than the corolla. (4)
+ Disc-florets fertile, with well-developed ovaries, styles as long as or longer than the corolla. (11)
4 (3) Basal and lower stem leaves ovate-orbicular, or oblong-elliptic to broadly ovate, deeply dissected pinnately or palmately or upper leaves simple and occasionally lower 3-5-cleft. (5)
+ Basal and lower stem leaves oblong-obovate to flabellate, mostly cuneate to incised dentate at the apices. 1 Artemisia japonica
5 (4) Leaves, when undissected, or leaf segments usually more than (1-) 1.5 mm wide. (6)
+ Leaf segments usually less than 1 mm wide. (9)
6 (5) Leaves twice or thrice pinnatipartite or pinnatisect. Florets less than 20 per capitulum. (7)
+ Leaves mostly simple, entire, occasionally lower 3-5-cleft. Florets more than 20 per capitulum. 2 Artemisia dracunculus
7 (6) Leaves not white-dotted on the upper surface, glabrous on both sides, ultimate leaf segments less than 2 mm wide. (8)
+ Leaves with white dots on the upper surface, densely grayish hairy to glabrescent below, ultimate leaf segments 2 mm or more wide. Panicle 10 cm or more wide. 14 Artemisia dubia
8 (7) Plants 50 – 80 (-90) cm tall. Capitula 2.5 – 3 mm long. 3 Artemisia desertorum
+ Plants 20 – 40 (-50) cm tall. Capitula 3 – 4 mm long, phyllaries glaucous. 4 Artemisia salsoloides
9 (5) Biennial or perennial, with usually more than 30 cm tall stems. Panicle broadly pyramidate, with more than 5 cm long branches. (10)
+ Annual or biennial herbs with procumbent to ascending , up to 20 (-30) cm tall stems. Panicle very narrowly pyramidate, c. 1.5 – 2 cm wide, with up to 4 cm long suberect branches. 5 Artemisia stricta
10 (9) Leaf segments linear-lanceolate, 3 – 4 (-5) mm long, 0.5 – 1 mm wide. 6 Artemisia scoparia
+ Leaf segments filiform, 8 – 12 mm long, 0.3 – 0.5 mm wide. 7 Artemisia capillaris
11 (3) Receptacle densely to obscurely hairy, sometimes glabrescent to glabrous. (12)
+ Receptacle glabrous. (17)
12 (11) Plants more than 30 cm tall. Capitula numerous, in narrow to broadly pyramidate panicle. (13)
+ Plants less than 30 cm tall. Capitula up to 30, in simple racemes. (16)
13 (12) Leaves oblong-obovate or broadly ovate or oblong-ovate or orbicular to oblate or flabellate. Capitula 3-5 mm across. (14)
+ Leaves triangular-ovate. Capitula 6 – 7 (-8) mm across. 8 Artemisia sieversiana
14 (13) Lower leaves with up to 1.5 cm long petioles; lamina oblong-obovate or orbicular to oblate or flabellate. (15)
+ Lower leaves with more than 1.5 (up to 10) cm long petioles; lamina broadly ovate or oblong-ovate, with 2 – 4 mm broad ultimate segments. 10 Artemisia absinthium
15 (14) Leaf blades orbicular to oblate or flabellate. Panicle oblong, 3-4 cm wide. 22 Artemisia rutifolia
+ Leaf blades oblong-obovate. Panicle ± oblong-pyramidate, 8 – 12 cm wide. 9 Artemisia persica
16 (12) Leaf petioles 10 – 15 mm long. Leaf blades 10 – 15 mm long and broad. Peduncles very short. 12 Artemisia macrocephala
+ Leaf petioles 4 – 5 mm long. Leaf blades flabellate, 4 – 6 mm long, 6 – 8 mm wide. Peduncles long. 11 Artemisia minor
17 (11) Ultimate leaf segments 2 mm or more wide. (18)
+ Ultimate leaf segments less than 1.5 mm wide. (22)
18 (17) Panicle broadly pyramidate, usually 10 cm or more wide. (19)
+ Panicle narrowly pyramidate, usually up to 10 cm or less wide. (23)
19 (18) Leaves not white-dotted on the upper surface. (20)
+ Leaves with white dots on the upper surface. 14 Artemisia dubia
20 (19) Capitula 3 – 4 x c. 2 mm, dense and compact in leafy panicle. Phyllaries grayish-arachnoid hairy, externally not shiny. 16 Artemisia vulgaris
+ Capitula 3 – 4 x c. 2 mm, lax in almost leafless panicle. Phyllaries glabrous, externally shiny. 15 Artemisia elegantissima
21 Panicle 2 – 3 cm broad, with 2.5 – 4 cm long, erect to ± patent branches. Phyllaries sparsely to densely arachnoid hairy outside. (22)
+ Panicle 5 – 10 cm broad, with obliquely patent to ascending, more than 4 cm long branches. Phyllaries glabrous. 17 Artemisia incisa
22 (17) Capitula 3 – 4 x 2 – 3 mm. Corolla of disc-florets completely glabrous. Cypselas c. 1.25 mm long. 19 Artemisia roxburghiana
+ Capitula 4 – 4.5 x 4 – 6 mm. Corolla of disc-florets apically sparsely hairy. Cypselas 1.75 – 2 mm long. 18 Artemisia moorcroftiana
23 (18) Capitula shortly peduncled, lax, nodding in narrow to broadly pyramidate, more than 5 cm wide, lax panicle with spreading or ascending branches. (24)
+ Capitula sessile, approximate, erect, congested in oblong, 1.5 – 5 cm wide, strict, contracted panicle with closely ascending to erect-appressed spicate branches. 20 Artemisia biennis
24 (23) Perennial, with several stems from the base. Leaves densely hairy on both sides or sparsely hairy to glabrous above and laxly to densely hairy beneath. (25)
+ Annaul, simple, sparsely puberulous stemmed herb. Leaves glabrous on both sides. 21 Artemisia annua
25 (24) Leaves oblong-obovate or orbicular to oblate or flabellate, densely sericeous or grayish hairy on both sides. Disc-floret corollas long hairy at apices. (26)
+ Leaves oblong-elliptic or oblong-ovate to broadly triangular-ovate, sparsely hairy or glabrous and green above with pitted glands, laxly to densely arachnoid hairy beneath. Disc-floret corollas not hairy at the apices. (27)
26 (25) Leaves orbicular to oblate or flabellate, palmately bipinnatisect into 2 – 12 mm long ultimate segments. Capitula 3.5 – 5 mm long and broad. 22 Artemisia rutifolia
+ Leaves oblong-obovate, grayish hairy, tripinnatisect with 1.5 – 2.5 mm long ultimate segments. Capitula 3 – 3.5 mm long and broad. 9 Artemisia persica
27 (25) Leaves auriculate at the base. Phyllaries strigose or sparsely hairy. (28)
+ Leaves exauriculate at the base. Phyllaries almost glabrous. 23 Artemisia laciniata
28 (27) Leaves narrowly tripinnatisect. Capitula 3 – 5 mm across; outermost phyllaries linear-oblong, not scarious-margined. 24 Artemisia santolinifolia
+ Lower leaves bipinnatisect. Capitula 2.5 – 3 mm across; outrmost phyllaries triangular-ovate, narrowly scarious margined, acute. 25 Artemisia gmelinii
 
 
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