Conyza bonariensis, Erigeron crispus, Flax-leaved Fleabane,
Hairy Fleabane, Asthmaweed, South American Horseweed,
Horseweed, Hebrew: קייצת מסולסלת, Arabic: ازنيوك

Scientific name:  Conyza bonariensis (L.) Cronquist
Synonym name:  Erigeron crispus Pourret
Common name:  Flax-leaved Fleabane, Hairy Fleabane, Asthmaweed, South American Horseweed
Hebrew name:   קייצת מסולסלת
Arabic name:   ازنيوك, KoweenzA
Plant Family:  Compositae / Asteraceae, מורכבים

Flora of Israel online, native plants, Palestine

Life form:  Therophyte, annual
Stems:  Erect; main stems usually branch near the base, lateral stems often taller than the central stem
Leaves:  Alternate, entire, narrow lanceolate leaves, coarsely toothed, covered with shoet stiff and long soft hairs; upper leaves are smaller and linear
Flowers:  Whitish flower heads; 10-20 disk flowers surrounded by female flowers that appear disklike; phyllaries mostly green or purplish, midveins sometimes brownish, not conspicuously filled with resin, densely hairy
Fruits / pods:  Achenes; pappus bristles mostly 3-4mm long, brownish white, often reddish with age.
Flowering Period:  April, May, June, July, August, September, October, November
Habitat:  Disturbed soils, cultivated areas
Distribution:  Mediterranean Woodlands and Shrublands, Semi-steppe shrublands, Shrub-steppes, Deserts and extreme deserts, Montane vegetation of Mt. Hermon
Chorotype:  American
Summer shedding:  Ephemeral

Conyza bonariensis, Erigeron crispus, Flax-leaved Fleabane, Hairy Fleabane, Asthmaweed, South American Horseweed, Horseweed, ازنيوك ,קייצת מסולסלת


Derivation of the botanical name:
Conyza, konops (Greek), "a gnat", and used by Pliny as a name for some kind of a fleabane, or konis (Greek), "dust", its powder being used to kill fleas.
bonariensis, named after Buenos Aires, Argentina.
Erigeron, Greek, er, spring; geron, an old man; suggested by the hoariness of some vernal species.
crispus, finely waved; closely curled.
  • The standard author abbreviation L. is used to indicate Carl Linnaeus (1707 – 1778), a Swedish botanist, physician, and zoologist, the father of modern taxonomy.
  • The standard author abbreviation Cronquist is used to indicate Arthur John Cronquist (1919 – 1992), a North American botanist and a specialist on Compositae.
  • The standard author abbreviation Pourret is used to indicate Pierre André Pourret (1754 – 1818), a French botanist.

Conyza bonariensis, Erigeron crispus, Flax-leaved Fleabane, Hairy Fleabane, Asthmaweed, South American Horseweed, Horseweed, ازنيوك ,קייצת מסולסלת