- Family : ASTERACEAE
- Family (As per The Plant List) : Asteraceae (Compositae)
- Species : Parthenium hysterophorus
- Species Name (as per The Plant List) : Parthenium hysterophorus L.
- Common name : Congress Weed
- Collection Nos : HFP 2107, CJS 10935
- Key identification features : A prolific undershrub with alternate, dissected leaves. Flowers are minute and aggregated into a compact flower-like inflorescence. Fruit is small and dry.
- Habit : Herb
- Native : West Indies, Central- & North America
- Comments : An obnoxious weed. Its pollen is known to be allergenic.
- Conservation Status : Not Evaluated (NE)
- Distribution Locality : Bagalkot, Bangalore, Belgaum, Bellary, Bidar, Bijapur, Chamrajnagar, Chikamagalur, Chikkaballapur, Chitradurga, Dakshina Kannada, Davanagere, Dharwad, Gadag, Gulbarga, Hassan, Haveri, Kodagu, Kolar, Koppal, Mandya, Mysore, Raichur, Ramanagara, Shimoga, Tumkur, Udupi, Uttara Kannada, Yadgir
- Floras referred : Saldanha & Nicolson, 1976 - Hassan; Seetharam et al., 2000 - Gulbarga; Rao & Razi, 1981 - Mysore; Keshava Murthy & Yoganarasimhan, 1990 - Coorg; Gopalakrishna Bhat, 2003 - Udupi; Manjunath et al., 2003 - Davanagere; cordata
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