Flora of North America species comparison

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Silphium terebinthinaceum

prairie rosinweed, prairie-dock
Habit 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.
Ray florets

17–29;

corollas yellow.
Disc florets

120–140;

corollas yellow.
Phyllaries

23–33 in 2–3 series, outer appressed, apices obtuse to acute, abaxial faces glabrous.
Cypselae

7–13 × 4–10 mm;

pappi 0–1 mm.

Silphium terebinthinaceum
Distribution
from FNA
AL; AR; GA; IA; IL; IN; KY; MI; MO; MS; NC; NE; NY; OH; SC; TN; VA; WI; ON
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Leaves pinnately lobed
var. pinnatifidum
1. Leaves not lobed
var. terebinthinaceum
Source FNA vol. 21, p. 78.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ecliptinae > Silphium
Sibling taxa
S. albiflorum, S. asteriscus, S. brachiatum, S. compositum, S. glutinosum, S. integrifolium, S. laciniatum, S. mohrii, S. perfoliatum, S. radula, S. wasiotense
Subordinate taxa
S. terebinthinaceum var. pinnatifidum, S. terebinthinaceum var. terebinthinaceum
Name authority Jacquin: Hort. Bot. Vindob. 1: 16, plate 43. (1770)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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