Silphium asteriscus var. dentatum

(Elliott) Chapman

Fl. South. U.S., 221. 1860.

IllustratedEndemic
Basionym: Silphium dentatum Elliott Sketch Bot. S. Carolina 2: 468. 1823
Synonyms: Silphium asteriscus var. angustatum A. Gray Silphium elliottii Greene Silphium incisum Small Silphium nodum
Treatment appears in FNA Volume 21. Treatment on page 82.

Plants 50–150 cm. Leaves: basal caducous; cauline opposite or alternate; faces hirsute, hispid, or scabrous. Paleae puberulent. Ray-florets 8–13. Disc-florets 35–120.2n = 14.


Phenology: Flowering summer.
Habitat: Meadows, open forests, along roadsides
Elevation: 0–1000 m

Distribution

V21-192-distribution-map.gif

Ala., Fla., Ga., N.C., S.C., Tenn.

Discussion

Varieties dentatum and angustatum are variable in the character of stem vestiture, have overlapping geographic ranges, and therefore are best treated as one variety.

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 +
(Elliott) Chapman +
bristlelike +
coroniform +
sessile +  and petiolate +
attenuate +  and round +
Silphium dentatum +
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. +, Fla. +, Ga. +, N.C. +, S.C. +  and Tenn. +
0–1000 m +
scabrous +, hispid +  and hirsute +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Meadows, open forests, along 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 +
persistent +
0 cm0 mm <br />0 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
Flowering summer. +
12 +  and 26 +
unequal +  and subequal +
Fl. South. U.S., +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
exalbuminous +
Illustrated +  and Endemic +
Scabrous (?) +, Hispid (?) +, Hirsute (?) +  and Glabrous (?) +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Silphium asteriscus var. angustatum +, Silphium elliottii +, Silphium incisum +  and Silphium nodum +
Silphium asteriscus var. dentatum +
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 +