Silphium perfoliatum

Linnaeus

Syst. Nat. ed. 10, 2: 1232. 1759.

Common names: Cup plant
Endemic
Treatment appears in FNA Volume 21. Treatment on page 79. Mentioned on page 77.

Plants caulescent, 75–300 cm; fibrous-rooted. Stems square, glabrous, hispid, or scabrous. Leaves: basal caducous; cauline usually opposite, rarely whorled (in 3s), petiolate or sessile; blades deltate, lanceolate, or ovate, 2–41 × 0.5–24 cm, bases attenuate or truncate (distal connate-perfoliate), margins entire, dentate, or bidentate, apices acuminate to acute, faces scabrous to hispid. Phyllaries 25–37 in 2–3 series, outer appressed, apices acute to acuminate, abaxial faces scabrous or hispid. Ray-florets 17–35; corollas yellow. Disc-florets 85–150 (–200); corollas yellow. Cypselae 8–12 × 5–9 mm; pappi 0.5–1.5 mm.

Distribution

V21-175-distribution-map.gif

Ont., Ala., Ark., Conn., Ill., Ind., Iowa, Kans., Ky., La., Mass., Mich., Minn., Miss., Mo., N.C., N.Dak., N.J., N.Y., Nebr., Ohio, Okla., Pa., S.Dak., Tenn., Tex., Va., Vt., W.Va., Wis.

Discussion

Varieties 2 (2 in flora).

Selected References

None.

Key

1 Stems glabrous or sparsely scabrous; peduncles glabrous Silphium perfoliatum var. connatum
1 Stems glabrous, hispid, or scabrous; peduncles usually scabrous to hispid Silphium perfoliatum var. perfoliatum

"broader" is not a number.

... more about "Silphium perfoliatum"
hispid +  and scabrous +
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 +
attenuate +
compound +  and simple +
2 cm20 mm <br />0.02 m <br /> (41 cm410 mm <br />0.41 m <br />) +
ovate;lanceolate;ovate;lanceolate;deltate +
0.5cm;24cm +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
sessile +  and petiolate +
whorled +  and opposite +
Cup plant +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
hairy +  and glabrous +
less orbiculate +  and obovate or cuneate +
0.5 cm5 mm <br />0.005 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
fertile +  and bisexual +
fertile +  and bisexual +
Ont. +, Ala. +, Ark. +, Conn. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, N.C. +, N.Dak. +, N.J. +, N.Y. +, Nebr. +, Ohio +, Okla. +, Pa. +, S.Dak. +, Tenn. +, Tex. +, Va. +, Vt. +, W.Va. +  and Wis. +
scabrous +  and hispid +
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 +
bidentate +  and dentate +
2-carpellate +
persistent +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
25 +  and 37 +
unequal +  and subequal +
Syst. Nat. ed. +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
exalbuminous +
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 perfoliatum +
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 +