Flora of North America species comparison

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Silphium integrifolium

entire-leaf rosinweed, prairie rosinweed, whole-leaf rosinweed
Habit Plants caulescent, 40–200 cm; fibrous rooted.
Stems

terete to slightly square, sparsely scabrous or glabrous (sometimes glaucous).
Leaves

basal caducous;

cauline opposite, sessile;

blades lanceolate to ovate, 2–23 × 0.1–11 cm, bases round to caudate, margins finely serrate or entire, apices acute to acuminate, faces hispid, scabrous, or glabrous.
Ray florets

12–36;

corollas yellow.
Disc florets

70–225;

corollas yellow.
Phyllaries

17–37 in 2–3 series, outer appressed, apices acute to acuminate, abaxial faces glabrous, hispid, pilose, or scabrous, sometimes stipitate-glandular.
Cypselae

9–14 × 6–10 mm;

pappi 1–4 mm.

Silphium integrifolium
Distribution
from FNA
AL; AR; IA; IL; IN; KS; KY; LA; MI; MO; MS; NE; NM; OK; SD; TN; TX; WI; WY; ON
[WildflowerSearch map]
[BONAP county map]
Discussion

Varieties 2 (2 in flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Key
1. Phyllaries: abaxial faces usually hispid, pilose, or scabrous, rarely glabrous; ray florets 12–22
var. integrifolium
1. Phyllaries: abaxial faces glabrous; ray florets 20–36+
var. laeve
Source FNA vol. 21, p. 80.
Parent taxa Asteraceae > tribe Heliantheae > subtribe Ecliptinae > Silphium
Sibling taxa
S. albiflorum, S. asteriscus, S. brachiatum, S. compositum, S. glutinosum, S. laciniatum, S. mohrii, S. perfoliatum, S. radula, S. terebinthinaceum, S. wasiotense
Subordinate taxa
S. integrifolium var. integrifolium, S. integrifolium var. laeve
Name authority Michaux: Fl. Bor.-Amer. 2: 146. (1803)
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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