6.
Hymenopappus artemisiifolius
de Candolle in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 658. 1836.
Biennials,
40—100 cm.
Leaves:
basal simple (5—20+ mm wide) or 1-pinnate, 8—20 cm, lobes 5—20+ × 1—5(—20+) mm; cauline 2—16
.
Heads
20—60 per stem.
Peduncles
1—6 cm.
Phyllaries
whitish (sometimes red-tinged) or yellowish, 5—12 × 2—7 mm.
Ray florets
0.
Disc florets
40—60; corollas white to purplish or yellowish to reddish, 3—5 mm, tubes 2—3 mm, throats funnelform, 1—1.5 mm, lengths 1—1.5 times lobes.
Cypselae
3.5—5 mm, hirtellous or villous;
pappi
of 16—18 scales 0.3—1(—1.5) or 1.5—2 mm.
Varieties 2 (2 in the flora): sc United States.
