110. Erechtites Rafinesque, Fl. Ludov. 65. 1817.
菊芹属 ju qin shu
Authors: Yilin Chen & Bertil Nordenstam
Herbs, annual or perennial, robust. Stems erect, branched. Leaves alternate, glabrous or pubescent, subentire, serrate, or pinnately lobed. Capitula disciform, heterogamous, in terminal paniculate corymbs, few calyculate. Involucres cylindric; phyllaries uniseriate, linear-lanceolate, equal, with scarious margins. Receptacle flat or slightly concave, alveolate or fimbriate. All florets tubular, fertile, outer florets biseriate or uniseriate, female, corolla filiform, 4- or 5-denticulate; central florets bisexual, funnelform, 5-denticulate. Anthers obtuse at base. Style branches elongate, apically truncate or obtuse, papillose. Achenes brownish, subcylindric, 10-ribbed. Pappus hairs many seriate, subequal, slender.
About five species: mainly in the Americas; two species (both introduced) in China.