Flora of North America species comparison

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Silphium perfoliatum

cup plant, cup-plant rosinweed
Habit Plants caulescent, 75–300 cm; fibrous rooted.
Stems

square, glabrous, hispid, or scabrous.
Leaves

basal caducous;

cauline usually opposite, rarely whorled (in 3s), petiolate or sessile;

blades deltate, lanceolate, or ovate, 2–41 × 0.5–24 cm, bases attenuate or truncate (distal connate-perfoliate), margins entire, dentate, or bidentate, apices acuminate to acute, faces scabrous to hispid.
Ray florets

17–35;

corollas yellow.
Disc florets

85–150 (–200);

corollas yellow.
Phyllaries

25–37 in 2–3 series, outer appressed, apices acute to acuminate, abaxial faces scabrous or hispid.
Cypselae

8–12 × 5–9 mm;

pappi 0.5–1.5 mm.

Silphium perfoliatum
Distribution
from FNA
AL; AR; CT; IA; IL; IN; KS; KY; LA; MA; MI; MN; MO; MS; NC; ND; NE; NJ; NY; OH; OK; PA; SD; TN; TX; VA; VT; WI; WV; ON
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Stems glabrous or sparsely scabrous; peduncles glabrous
var. connatum
1. Stems glabrous, hispid, or scabrous; peduncles usually scabrous to hispid
var. perfoliatum
Source FNA vol. 21, p. 79.
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. radula, S. terebinthinaceum, S. wasiotense
Subordinate taxa
S. perfoliatum var. connatum, S. perfoliatum var. perfoliatum
Name authority Linnaeus: Syst. Nat. ed. 10, 2: 1232. (1759)
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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