Difference between revisions of "Silphium terebinthinaceum"
Hort. Bot. Vindob. 1: 16, plate 43. 1770.
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|tribe=Asteraceae tribe Heliantheae | |tribe=Asteraceae tribe Heliantheae | ||
|subtribe=Asteraceae (tribe Heliantheae) subtribe Ecliptinae | |subtribe=Asteraceae (tribe Heliantheae) subtribe Ecliptinae | ||
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Revision as of 21:10, 5 November 2020
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
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.
Lower Taxa
Key
| 1 | Leaves pinnately lobed | Silphium terebinthinaceum var. pinnatifidum |
| 1 | Leaves not lobed | Silphium terebinthinaceum var. terebinthinaceum |