Silphium compositum

Michaux

Fl. Bor.-Amer. 2: 145. 1803.

Common names: Kidney-leaf rosinweed
Endemic
Synonyms: Silphium compositum subsp. ovatifolium (Torrey & A. Gray) C. R. Sweeney & T. R. Fisher Silphium compositum subsp. reniforme (Rafinesque ex Nuttall) C. R. Sweeney & T. R. Fisher Silphium compositum var. reniforme (Rafinesque ex Nuttall) Torrey & A. Gray Silphium compositum subsp. venosum (Small) C. R. Sweeney & T. R. Fisher Silphium compositum var. venosum (Small) Kartesz & Gandhi Silphium lapsuum Silphium orae Silphium ovatifolium Silphium reniforme Silphium venosum
Treatment appears in FNA Volume 21. Treatment on page 79. Mentioned on page 77.

Plants scapiform, 50–250 cm; taprooted. Stems terete, glabrous (sometimes glaucous). Leaves: basal persistent, petiolate; cauline alternate, petiolate or sessile; blades cordate, deltate, elliptic, hastate, ovate, reniform, or sagittate, 2–35 × 0.5–52 cm, sometimes (proximal) pinnately or palmately lobed, bases oblique, truncate, attenuate, cordate, sagittate, or hastate, ultimate margins toothed, apices acute, faces glabrous, hispid, or scabrous. Phyllaries 11–18 in 2–3 series, outer appressed to reflexed, apices obtuse to cuspidate, abaxial faces sparsely scabrous. Ray-florets 6–12; corollas yellow. Disc-florets 20–85; corollas yellow. Cypselae 6–12 × 4–10 mm; pappi 1–4 mm. 2n = 14.


Phenology: Flowering summer–early fall.
Habitat: Open, pine and oak forests, sandy soils, fields, roadsides, meadows
Elevation: 0–1600 m

Distribution

V21-174-distribution-map.gif

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

Discussion

Selected References

None.

Lower Taxa

None.

"broader" is not a number.

... more about "Silphium compositum"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
obtuse;cuspidate +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
racemiform +  and paniculiform +
indeterminate +  and determinate +
Jennifer A. Clevinger +
Michaux +
bristlelike +
coroniform +
hastate +, sagittate +, cordate +, attenuate +, truncate +  and oblique +
compound +  and simple +
2 cm20 mm <br />0.02 m <br /> (35 cm350 mm <br />0.35 m <br />) +
lobed;sagittate;reniform;sagittate;reniform;ovate;hastate;elliptic;deltate;cordate +
0.5 cm5 mm <br />0.005 m <br /> (52 cm520 mm <br />0.52 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
sessile +  and petiolate +
Kidney-leaf rosinweed +
0.6 cm6 mm <br />0.006 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
hairy +  and glabrous +
less orbiculate +  and obovate or cuneate +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
fertile +  and bisexual +
fertile +  and bisexual +
Ala. +, Fla. +, Ga. +, N.C. +, S.C. +, Tenn. +, Va. +  and W.Va. +
0–1600 m +
scabrous +, hispid +  and glabrous +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Open, pine and oak forests, sandy soils, fields, roadsides, meadows +
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 /> (0.4 cm4 mm <br />0.004 m <br />) +
Flowering summer–early fall. +
11 +  and 18 +
unequal +  and subequal +
Fl. Bor.-Amer. +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
exalbuminous +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Silphium compositum subsp. ovatifolium +, Silphium compositum subsp. reniforme +, Silphium compositum var. reniforme +, Silphium compositum subsp. venosum +, Silphium compositum var. venosum +, Silphium lapsuum +, Silphium orae +, Silphium ovatifolium +, Silphium reniforme +  and Silphium venosum +
Silphium compositum +
Silphium +
species +
cylindric +
cylindric +
shorter to longer than campanulate +
20 cm200 mm <br />0.2 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +
200 cm2,000 mm <br />2 m <br /> (400 cm4,000 mm <br />4 m <br />) +