Of four genera which Hooker singles out as the largest in Sikkim, in China Corydalis has 76 species, Saxifraga 58, Pedicularis 129, and Primula 77.
Upon the exposed mountain slopes a species of rhubarb (Rheum Ribes) is noticeable.
Some American genera (Corydalis) which belong to this family are gigantic among insects and their males possess enormous mandibles.
In America there are two genera, Corydalis and Chauliodes, which are remarkable for their relatively gigantic size and for the immense length and sabre-like shape of the mandibles.
Thus in Dicentra and Corydalis there are six stamens in two bundles; the central one of each bundle alone is perfect, the lateral ones have each only half an anther, and are really stipules formed from the staminal leaf.
In Valeriana, Antirrhinum and Corydalis, the spur is very short, and the corolla or petal is said to be gibbous, or saccate, at the base.