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Fabaceae-Faboideae  family

Crotalaria spectabilis
Roth
, Nov. Pl. Sp. 341-342. 1821.

Chakchak
Naturalized quite rare herb of ditches and sandy depressions at lower elevations.
Native to tropical Asia and widely naturalized in tropics.
Simple leaves. Most easily distinguished from Crotalaria retusa by its flowers which are pure yellow color and by its much greater height (up to 2 m).