Silphium laciniatum

Linnaeus

Sp. Pl. 2: 919. 1753.

Common names: Compass plant
IllustratedEndemic
Synonyms: Silphium laciniatum var. robinsonii L. M. Perry
Treatment appears in FNA Volume 21. Treatment on page 78. Mentioned on page 77.

Plants scapiform, (40–)100–300 cm; taprooted. Stems terete, hirsute, hispid, or scabrous. Leaves: basal persistent, petiolate or sessile; cauline petiolate or sessile; blades lanceolate, linear, ovate, or rhombic, 4–60 × 1–30 cm, usually (proximal) 1–2-pinnately lobed, bases attenuate to truncate, ultimate margins unevenly toothed or entire, apices acute, faces hirsute, hispid, or scabrous. Phyllaries 25–45 in 2–3 series, outer reflexed or appressed, apices acuminate to caudate, abaxial faces hispid to scabrous, ± stipitate-glandular. Ray florets 27–38; corollas yellow. Disc florets 100–275; corollas yellow. Cypselae 10–18 × 6–12 mm; pappi 1–3 mm. 2n = 14.


Phenology: Flowering summer–early fall.
Habitat: Prairies, open, disturbed sites
Elevation: 50–600 m

Distribution

V21-170-distribution-map.gif

Ont., Ala., Ark., Ill., Ind., Iowa, Kans., Ky., La., Mich., Minn., Miss., Mo., Nebr., N.Mex., N.Y., Ohio, Okla., Pa., S.Dak., Tenn., Tex., Wis.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Silphium laciniatum"
Jennifer A. Clevinger +
Linnaeus +
Compass plant +
Ont. +, Ala. +, Ark. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Mich. +, Minn. +, Miss. +, Mo. +, Nebr. +, N.Mex. +, N.Y. +, Ohio +, Okla. +, Pa. +, S.Dak. +, Tenn. +, Tex. +  and Wis. +
50–600 m +
Prairies, open, disturbed sites +
Flowering summer–early fall. +
Illustrated +  and Endemic +
Silphium laciniatum var. robinsonii +
Silphium laciniatum +
Silphium +
species +