Children (9 direct children, 9 direct and indirect children):
Cirsium undulatum var. ciliolatum
Cirsium undulatum f. album
Cirsium undulatum var. undulatum
Cirsium undulatum var. tracyi
Cirsium undulatum subsp. helleri
Cirsium undulatum var. megacephalum
Cirsium undulatum var. franktonis
Cirsium undulatum var. albescens
Cirsium undulatum var. grahamii