23. Corydalis sect. Tetragonia Z. Y. Su & Lidén, Fl. China. 7: 345. 2008.
方茎紫堇组 fang jing zi jin zu
Type: Corydalis capnoides (Linnaeus) Persoon, Syn. Pl. 2: 270. 1806.
Herbae annuae vel biennes ramosae. Bracteae foliaceae. Petala pallide lutea. Capsulae lineari-oblongae, in sectione transversali tetragonae, abrupte dehiscentes.
Herbs, annual or biennial, diffusely branched. Bracts large, leaflike. Petals pale yellow. Capsule linear-oblong, squarish in cross section, explosively dehiscent.
One species: C Europe to E Siberia, south to C Asia and Xinjiang, China.
The sectional epithet refers to the 4-angled cross section of the capsule, from Greek τετρά- (tetra-, "four" in compound words) and γωνία (gonia, "corner" or "angle").
