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Published In: Species Plantarum 2: 843. 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: Spathipappus Tzvelev in Schischk. & Bobrov, Fl. USSR 26: 875. 1961; Podlech in Rech. f., Fl. Iran. Comp. IV. 158: 148. 1986.
General/Distribution: A fairly large genus comprising c. 152 species, distributed mainly in Europe and temperate Asia, N Africa, N America and in the southern hemisphere by introduction (Humphries, 1993). Represented in Pakistan by 12 species, mainly confined to mountainous areas in North and North West.
Comment/Acknowledgements: Co-author: Ronaq Khan, Natural History Museum, London.


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Perennial or rarely annual herbs, usually aromatic, often rhizomatous and basally woody shrublets with erect or ascending, leafy and branched, sometimes subscapiform shoots. Leaves alternate, pinnatifid or 1-3-pinnatisect, punctate, rarely entire, serrate. Capitula heterogamous, radiate, disciform, or discoid, solitary or corymbose. Involucre hemispherical or shallowly to broadly campanulate, phyllaries 3-4-seriate, imbricate, with scarious or sometimes with dark brown margins. Receptacle flat, hemispherical or convex, epaleate. Ray-florets, when present, female, fertile or sterile, with 3-lobed, white, yellow or pink ligules, in discoid forms tubular, female or hermaphrodite. Disc-florets tubular, 5-lobed, yellow. Anthers minutely sagitatte at the bases, apically ovate-appendaged. Cypselas homomorphic, flat, usually oblong, 5-12-ribbed, glabrous or with sessile glands, without myxogenic cells or secretory canals. Pappus a corona or usually unevenly toothed, scaly or lobed, sometimes adaxially well-developed.

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1 Capitula discoid, with all florets tubular. (11)
+ Capitula radiate, with marginal florets ligulate. (2)
2 (1) Ligules white. (3)
+ Ligules pale pink to reddish-pink. 9 Tanacetum coccineum
3 (2) Capitula solitary, terminal. (4)
+ Capitula few (3) to many (30), in lax corymbs. 2 Tanacetum parthenium
4 (3) Ligulate florets sterile, with ovaries jointed with the corolla bases. (10)
+ Ligulate florets fertile, with the ovaries not jointed with the corolla bases. (5)
5 (4) Pappus of a short corona or deltate rigid teeth. (6)
+ Pappus of obtuse, membranous scales. 3 Tanacetum pakistanicum
6 (5) Leaves divided more than halfway to midrib; Capitula longer than broad. (7)
+ Leaves divided less than halfway to midrib; capitulum broader than long. 4 Tanacetum emodi
7 (6) Leaves not clustered around the inflorescence, mostly in the middle or lower half of the stem. (8)
+ Leaves clustered around the inflorescence. 5 Tanacetum roylei
8 (7) Leaves glabrescent to glabrous, uppermost leaves linear, entire. Involucre less than 10 mm in diameter. (9)
+ Leaves densely silvery-gray pubescent on both sides, uppermost leaves dissected. Involucre 12 – 18 mm in diameter. 8 Tanacetum cinerariifolium
9 (8) Leaves pinnatisect. Pappus shortly coronate, c. 0.25 (- 0.5) mm long. 6 Tanacetum stoliczkae
+ Leaves pinnatifid. Pappus of irregular teeth and linear, free appendages. 7 Tanacetum baltistanicum
10 (4) Leaves 20 – 50 mm long, 2-3-pinnatisect. Phyllaries with dark scarious margins. Pappus more than 1.5 mm long. 11 Tanacetum griffithii
+ Leaves 5 – 10 mm long, unipinnatisect. Phyllaries with pale puberulous margins. Pappus less than 1 mm long. 12 Tanacetum chitralense
11 (1) Leaves less than 3 cm long, with inconspicuous or short petioles. 10 Tanacetum artemisioides
+ Leaves more than 4 cm long, with long petioles. 1 Tanacetum falconeri
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