Silphium asteriscus

Linnaeus

Sp. Pl. 2: 920. 1753.

Common names: Starry rosinweed
IllustratedEndemic
Treatment appears in FNA Volume 21. Treatment on page 81. Mentioned on page 77, 78, 82.

Plants caulescent, 30–200 cm; fibrous-rooted. Stems terete, glabrous, hirsute, hispid, or scabrous. Leaves: basal persistent or caducous, petiolate or sessile; cauline alternate, opposite, or whorled, petiolate or sessile; blades simple, lanceolate, falcate, or ovate, 1.5–25 × 0.5–5 cm, bases attenuate to round, margins dentate, serrate, or entire, apices acuminate, acute, or obtuse, faces glabrous, hirsute, hispid, or scabrous. Phyllaries 12–26 in 2–3 series, outer appressed or reflexed, apices acute to acuminate, abaxial faces hispid or scabrous. Ray-florets 8–21; corollas yellow. Disc-florets 35–150; corollas yellow. Cypselae 6–15 × 4–11 mm; pappi 0–5 mm.

Distribution

V21-188-distribution-map.gif

Ala., Ark., Fla., Ga., Ill., Ind., Ky., La., Md., Miss., Mo., N.C., N.Y., Ohio, Okla., Pa., S.C., Tenn., Tex., Va., W.Va.

Discussion

Varieties 5 (5 in the flora).

Selected References

None.

Key

1 Leaf faces glabrous or sparsely hairy > 2
1 Leaf faces hirsute, hispid, or scabrous > 3
2 Cauline leaves mostly whorled (in 3s) Silphium asteriscus var. trifoliatum
2 Cauline leaves mostly opposite Silphium asteriscus var. latifolium
3 Basal leaves persistent Silphium asteriscus var. simpsonii
3 Basal leaves caducous. > 4
4 Paleae puberulent and stipitate-glandular Silphium asteriscus var. dentatum
4 Paleae puberulent to scabrous (not glandular) Silphium asteriscus var. asteriscus

"broader" is not a number.

... more about "Silphium asteriscus"
scabrous +  and hispid +
not tailed +, rounded +  and obtuse +
connate +  and distinct +
acute;acuminate +
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 +
caducous +  and persistent +
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 +
0.5 cm5 mm <br />0.005 m <br /> (5 cm50 mm <br />0.05 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
sessile +  and petiolate +
whorled +, opposite +  and alternate +
Starry rosinweed +
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. +, Ill. +, Ind. +, Ky. +, La. +, Md. +, Miss. +, Mo. +, N.C. +, N.Y. +, Ohio +, Okla. +, Pa. +, S.C. +, Tenn. +, Tex. +, Va. +  and W.Va. +
scabrous +, hispid +, hirsute +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
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 />) +
12 +  and 26 +
unequal +  and subequal +
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 +
Undefined (tribe Undefined) subtribe Enceliinae +, Undefined (tribe Undefined) subtribe Engelmanniinae +, Undefined (tribe Undefined) subtribe Spilanthinae +, Undefined (tribe Undefined) subtribe Verbesininae +  and Undefined (tribe Undefined) subtribe Zinniinae +
Silphium asteriscus +
Silphium +
species +
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 +
200 cm2,000 mm <br />2 m <br /> (400 cm4,000 mm <br />4 m <br />) +