11. Tanacetum Linnaeus, Sp. Pl. 843. 1753 pro parte; Gen. Pl. ed. 5. 366. 1754 emend. Tzvelev in Schischk. & Bobrov, Fl. USSR 26: 303. 2000 (Engl. transl.); Podlech in Rech. f., Fl. Iran. Comp. IV. 158: 1986- pro parte; K. Bremer & Humphries in Bull. Nat. Hist. Mus. Lond. (Bot.) 23(2): 100. 1993; K. Bremer, Asteraceae: 465. 1994; Grierson & Springate in Grierson, D. G. Long & Springate, Fl. Bhutan 2 (3): 1549. 2001.
Spathipappus Tzvelev in Schischk. & Bobrov, Fl. USSR 26: 875. 1961; Podlech in Rech. f., Fl. Iran. Comp. IV. 158: 148. 1986.
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.
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.
Co-author: Ronaq Khan, Natural History Museum, London.