Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.
1 Fertile plants 5-22 dm tall; main stems (2-) 4-15 mm wide at the base of the plant; petiole (2-) 5-40 mm long; larger leaf blades (2.5-) 4-12 cm wide; inflorescence head 0.8-3.2 cm wide with 30-100 flowers; larger phyllaries (2.5-) 3-4 mm wide; corollas 7-9 mm long; [collectively widespread]
..2 Leaf blades linear to elliptic (lower ones sometimes broadly elliptic or rarely all short and broadly elliptic), unlobed or scarcely lobed, usually 5-13× as long as wide; peduncles (2-) 5-20 cm long; phyllaries 4-5.5 mm long; paleae 4-5 mm long
..2 Leaf blades ovate to 3-lobed, rarely elliptic, 1-4× as long as wide; peduncles 2.5-10 cm long; phyllaries 4.5-7 mm long; paleae 5.5-7 mm long