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Published In: Species Plantarum 2: 863. 1753. (1 May 1753) (Sp. Pl.) Name publication detailView in BotanicusView in Biodiversity Heritage Library

Project Name Data (Last Modified On 5/8/2022)
Acceptance : Accepted
Project Data     (Last Modified On 2/12/2022)
Contributor Text: Roohi Abid, M. Qaiser & Rubina Abid
Contributor Institution:

Centre for Plant Conservation, University of Karachi – Pakistan


Department of Botany, ‎University of Karachi, Karachi

Synonym Text:

Conyza canadensis (L.) Cronquist in Bull. Torr. Bot. Club 70(6): 632. 1943; R. R. Stewart, Ann. Cat. Vasc. Pl. W. Pak. & Kashm. 734. 1972; Grierson in P. H. Davis, l.c. 132; Grierson in Rech. f., Fl. Iran. Comp. Astereae V. 154 : 62. 1982; Hajra in Hajra et al., l. c. 105; Grierson & Long in Springate, l. c. 1546.


Fl. Per.: June – October                             Vern.: Canadian horse weed, Canada Fleabane


Type: Described from Canada, America and Europe (Hb. Cliff. 407/3).


A North American species, widely distributed throughout the temperate and tropical areas of the world.


A very common weed in both plains and hills, ascending upto 3000 m a.s.l.

It is hardly put to any use in Pakistan. However, the plant is used in traditional North American herbal medicine for the treatment of various ailments. The whole plant is boiled to make steam and taken as snuff to treat cold and cough. It is also used for the cure of gastro-intestinal problems including diarrhoea, dysentery and internal haemorrhages. Applied externally to treat gonorrhoea and bleeding piles.

Map Location:

A–7 Gilgit Distt.: Shanus along KKH Road, Nagar 1900 m alt., 16.09.2008, Sajjad Haider 1452 (KUH); B–6 Chitral Distt.: Brir 5000', 27.07.1951, M. A. Siddiqui & Dr. Rahman 26820 (RAW); B–7 Swat Distt.: 2½ miles from Khawaja Khail on way to Shangla, 27.07.1971, Sultanul Abedin 8282 (KUH); 34 miles from Rabat on way to Dir, 17.07.1971, Sultanul Abedin 7830 (KUH); Dir, 08.08.1972, Farrukh Hussain 7095 (RAW); Lowari top, exposed side near cultivated field, abundant 10000 ft. (?), 05.10.1964, Saleem 113 (K); Shangla Pass, Swat, ± 6500 ft., 17.09.1976, Dilawar & Naim Shah s. n. (K); Abbottabad Distt.: 2 miles from Abbottabad on way to Mansehra, 09.08.1971, Sultanul Abedin & M. Qaiser 8635 (KUH); B–8 Kashmir: Srinagar Distt.: Drained lake basin of Kashmir enrivons of Srinagar, within a circle of 8 miles radius, August 10 – 30 September, 1856 Schlangitweit 4306 (BM); Pindergas Town, Morkoli, 17.08.1981, Kamal A. Malik & S. Nazimuddin 1993 (KUH); Sindh Valley, 7500 ft., Kashmir, 02.09.1876, C. B. Clarke 301136 (BM).


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Annual herbs, 30–90 cm tall. Stem erect, much branched from above, indumentum variable, glabrous or hirsute. Leaves 4–6 cm long, 0.3–1.0 cm wide, linear or narrowly oblanceolate, acute, basally attenuate, lower ones petiolate, upper sessile to subsessile, pilose at the margins. Capitula in dense raceme, 5–6 mm across on 5–10 mm long peduncle. Involucre subcylindric–urceolate, phyllaries 2–3–seriate, linear–lanceolate, acuminate, hyaline, scarious, outer ones smaller, inner ca 3 mm long. Receptacle epaleate. Ray florets female thin, 20–40, white, ligule 0.75–1 mm long. Disc florets almost equalling or slightly longer than the ray florets, yellow, tubular, ca 3 mm long, 4–lobed. Cypselas oblong, ± compressed, sparsely pubescent, 1–1.5 mm long. Pappus uniseriate, bristles 12–16 (–25), barbellate, yellowish – dirty white, ca 3 mm long.

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