Silphium glutinosum

J. R. Allison

Castanea 66: 183, figs. 11, 12A–C. 2001.

Common names: Sticky rosinweed
Treatment appears in FNA Volume 21. Treatment on page 81. Mentioned on page 78.

Plants caulescent 80–150(–180) cm; fibrous rooted. Stems terete, scabrous, stipitate-glandular. Leaves: basal caducous; cauline usually opposite, rarely alternate, petiolate or sessile; blades lanceolate to ovate, 3–22 × 1–12 cm, bases attenuate to rounded, margins toothed or entire, apices acute to acuminate, faces scabrous, stipitate-glandular. Phyllaries 19–23 in 3–4 series, outer appressed to reflexed, apices acute to obtuse, abaxial faces scabrous, stipitate-glandular. Ray florets 8–16; corollas pale yellow. Disc florets 50–70; corollas pale yellow. Cypselae 6–8.5 × 4–7 mm; pappi 0.5–2 mm. 2n = 14.

Phenology: Flowering summer–early fall.
Habitat: Limestone glades, along rocky streams
Elevation: 100–300 m


James Allison (in protologue) suggested that Silphium perplexum is a hybrid between S. glutinosum and S. integrifolium. It has glandular hairs on its stems, leaves, and phyllaries as in S. glutinosum; it is also found on chalk, has taller stems, larger leaf blades, and deeper yellow corollas. Further study is needed to determine its status.

Selected References


Lower Taxa

... more about "Silphium glutinosum"
Jennifer A. Clevinger +
J. R. Allison +
Sticky rosinweed +
100–300 m +
Limestone glades, along rocky streams +
Flowering summer–early fall. +
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 glutinosum +
Silphium +
species +