Vegetative key to the families

LATEX (milky white or yellow) present in stem and leaves
Herbs
Either; leaves all basal or basal and cauline; or, all cauline and exceeding 5 cm long
Leaves glabrous or with prickly hairs on the blades, c. 10 cm wide, the petioles not bristly-hairy nor the leaves mottled with yellow (Sylibum, tribe Lactuceae) Asteraceae
Burr not formed around the fruits at maturity
Florets all tubular or filiform and tubular (Fig. 41) or; florets with ligule present but the ligule less than 3mm
Florets ligulate and tubular, or all ligulate; ligule more than 3 mm long