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.
... more about "Silphium compositum"
Jennifer A. Clevinger +
Michaux +
Kidney-leaf rosinweed +
Ala. +, Fla. +, Ga. +, N.C. +, S.C. +, Tenn. +, Va. +  and W.Va. +
0–1600 m +
Open, pine and oak forests, sandy soils, fields, roadsides, meadows +
Flowering summer–early fall. +
Fl. Bor.-Amer. +
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 +