Hymenopappus artemisiifolius

de Candolle in A. P. de Candolle and A. L. P. P. de Candolle

in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 5: 658. 1836.

Endemic
Treatment appears in FNA Volume 21. Treatment on page 314. Mentioned on page 310.

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.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

Key

1 Cauline leaves (6–)8–16; phyllaries 6–12 mm; corollas whitish to purplish; pappi 0.3–1(–1.5) mm Hymenopappus artemisiifolius var. artemisiifolius
1 Cauline leaves 2–8; phyllaries 5–7 mm; corollas yellowish to reddish; pappi 1.5–2 mm Hymenopappus artemisiifolius var. riograndensis
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
indeterminate +  and determinate +
John L. Strother +
de Candolle in A. P. de Candolle and A. L. P. P. de Candolle +
1-pinnate +  and simple +
8 cm80 mm <br />0.08 m <br /> (20 cm200 mm <br />0.2 m <br />) +
decurrent +
compound +  and simple +
toothed +
1-2+ times pinnately lobed ultimate margins usually entire +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
2 (?) +  and 16 (?) +
white +  and purplish or yellowish +
0.3 cm3 mm <br />0.003 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
villous +  and hirtellous +
obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Ark. +, La. +  and Tex. +
tomentose +, hairy +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
discoid +  and radiate +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
obconic;hemispheric +
cauline +  and basal +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (2 cm20 mm <br />0.02 m <br />) +
deltate +  and filiform +
1mm +  and 5mm +
dentate to pinnatifid or palmatifid +  and entire +
2-carpellate +
persistent +
of 12 +  and 22 orbiculate to spatulate scales +
1 cm10 mm <br />0.01 m <br /> (6 cm60 mm <br />0.06 m <br />) +
scarious-margined +
0.5 cm5 mm <br />0.005 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
5 +  and 13 +
0.2 cm2 mm <br />0.002 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
bearing subulate enations +, hairy +  and bristly +
convex;flat +
1.5-2 mm +, 0.3 +  and 1 +
orbiculate +  and spatulate +
exalbuminous +
scapiform +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Compositae +
Hymenopappus artemisiifolius +
Hymenopappus +
species +
1-1.5 times lobes +
campanulate +  and dilated +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
toothed +  and entire +
5 cm50 mm <br />0.05 m <br /> (20 cm200 mm <br />0.2 m <br />) +
40 cm400 mm <br />0.4 m <br /> (100 cm1,000 mm <br />1 m <br />) +
tree +, shrub +  and subshrub +