Silphium terebinthinaceum

Jacquin

Hort. Bot. Vindob. 1: 16, plate 43. 1770.

Common names: Prairie-dock
Endemic
Treatment appears in FNA Volume 21. Treatment on page 78. Mentioned on page 77.

Plants scapiform, (40–)100–250+ cm; taprooted. Stems terete, glabrous. Leaves: basal persistent, petiolate; cauline alternate, petiolate or sessile; blades cordate, deltate, lanceolate, ovate, or sagittate, 3–40 × 1–40 cm, sometimes (proximal) pinnately lobed, bases attenuate, cordate, hastate, round, or truncate, ultimate margins coarsely toothed or entire, apices acuminate, acute, or obtuse, faces glabrous or scabrous. Phyllaries 23–33 in 2–3 series, outer appressed, apices obtuse to acute, abaxial faces glabrous. Ray florets 17–29; corollas yellow. Disc florets 120–140; corollas yellow. Cypselae 7–13 × 4–10 mm; pappi 0–1 mm.

Distribution

V21-171-distribution-map.gif

Ont., Ala., Ark., Ga., Ill., Ind., Iowa, Ky., Mich., Miss., Mo., N.C., N.Y., Nebr., Ohio, S.C., Tenn., Va., Wis.

Discussion

Varieties 2 (2 in the flora).

Selected References

None.

... more about "Silphium terebinthinaceum"
Jennifer A. Clevinger +
Jacquin +
Prairie-dock +
Ont. +, Ala. +, Ark. +, Ga. +, Ill. +, Ind. +, Iowa +, Ky. +, Mich. +, Miss. +, Mo. +, N.C. +, N.Y. +, Nebr. +, Ohio +, S.C. +, Tenn. +, Va. +  and Wis. +
Hort. Bot. Vindob. +
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 terebinthinaceum +
Silphium +
species +