Silphium asteriscus var. asteriscus

Endemic
Synonyms: Silphium asperrimum Hooker Silphium asteriscus var. scabrum (C. Mohr) H. E. Ahles Silphium dentatum var. gatesii L. M. Perry Silphium gatesii Michaux Silphium integrifolium var. gattingeri Silphium laevigatum Elliott Silphium scaberrimum
Treatment appears in FNA Volume 21. Treatment on page 82.

Plants 40–150 cm. Leaves: basal caducous; cauline opposite or alternate; faces hirsute, hispid, or scabrous. Paleae puberulent to scabrous. Ray-florets 8–20. Disc-florets 35–110.2n = 14.


Phenology: Flowering summer–early fall.
Habitat: Prairies, meadows, open forests, roadsides
Elevation: 50–1000 m

Distribution

V21-193-distribution-map.gif

Ala., Ark., Fla., Ga., Ky., La., Miss., Mo., N.C., Okla., S.C., Tenn., Tex., Va.

Discussion

The name Silphium asperrimum has been misapplied to S. radula. Based upon examination of a photograph of the type and of the original description, S. asperrimum should be synonymized with S. asteriscus.

Selected References

None.

Lower Taxa

None.

"broader" is not a number.

scabrous +  and hispid +
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
racemiform +  and paniculiform +
indeterminate +  and determinate +
Jennifer A. Clevinger +
Linnaeus +
bristlelike +
coroniform +
sessile +  and petiolate +
attenuate +  and round +
1.5 cm15 mm <br />0.015 m <br /> (25 cm250 mm <br />0.25 m <br />) +
ovate;falcate;ovate;falcate;lanceolate +
0.5cm;5cm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
sessile +  and petiolate +
alternate +  and opposite +
0.6 cm6 mm <br />0.006 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
hairy +  and glabrous +
less orbiculate +  and obovate or cuneate +
0.4 cm4 mm <br />0.004 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
fertile +  and bisexual +
fertile +  and bisexual +
Ala. +, Ark. +, Fla. +, Ga. +, Ky. +, La. +, Miss. +, Mo. +, N.C. +, Okla. +, S.C. +, Tenn. +, Tex. +  and Va. +
50–1000 m +
scabrous +, hispid +  and hirsute +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Prairies, meadows, open forests, roadsides +
in cymiform , corymbiform , paniculiform , racemiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
campanulate;hemispheric +
sessile +  and petiolate +
alternate +, subopposite +, opposite +  and whorled +
cauline +  and basal +
deltate +
entire +, serrate +  and dentate +
toothed +  and entire +
reflexed +  and appressed +
2-carpellate +
puberulent +  and scabrous +
persistent +
0 cm0 mm <br />0 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering summer–early fall. +
12 +  and 26 +
unequal +  and subequal +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
exalbuminous +
Scabrous (?) +, Hispid (?) +, Hirsute (?) +  and Glabrous (?) +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Silphium asperrimum +, Silphium asteriscus var. scabrum +, Silphium dentatum var. gatesii +, Silphium gatesii +, Silphium integrifolium var. gattingeri +, Silphium laevigatum +  and Silphium scaberrimum +
Silphium asteriscus var. asteriscus +
Silphium asteriscus +
variety +
cylindric +
cylindric +
shorter to longer than campanulate +
toothed +  and entire +
20 cm200 mm <br />0.2 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +
fibrous-rooted +  and caulescent +