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.

"broader" is not a number.

... more about "Silphium laciniatum"
stipitate-glandular +, hispid +  and scabrous +
not tailed +, rounded +  and obtuse +
connate +  and distinct +
acuminate;caudate +
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 truncate +
compound +  and simple +
4 cm40 mm <br />0.04 m <br /> (60 cm600 mm <br />0.6 m <br />) +
lobed;rhombic;ovate;rhombic;ovate;linear;lanceolate +
1 cm10 mm <br />0.01 m <br /> (30 cm300 mm <br />0.3 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
sessile +  and petiolate +
Compass plant +
1 cm10 mm <br />0.01 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
hairy +  and glabrous +
less orbiculate +  and obovate or cuneate +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
fertile +  and bisexual +
fertile +  and bisexual +
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 +
scabrous +, hispid +  and hirsute +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Prairies, open, disturbed sites +
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 +
dentate to pinnatifid or palmatifid +  and entire +
toothed +  and entire +
appressed +  and reflexed +
2-carpellate +
persistent +
0.1 cm1 mm <br />0.001 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
Flowering summer–early fall. +
25 +  and 45 +
unequal +  and subequal +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
exalbuminous +
Illustrated +  and Endemic +
scabrous +, hispid +  and hirsute +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Silphium laciniatum var. robinsonii +
Silphium laciniatum +
Silphium +
species +
cylindric +
cylindric +
shorter to longer than campanulate +
entire +  and toothed +
20 cm200 mm <br />0.2 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +
40 cm400 mm <br />0.4 m <br /> (100 cm1,000 mm <br />1 m <br />) +