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

Discussion

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

None.

Lower Taxa

None.

"broader" is not a number.

... more about "Silphium glutinosum"
stipitate-glandular +
not tailed +, rounded +  and obtuse +
connate +  and distinct +
acute;obtuse +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
racemiform +  and paniculiform +
indeterminate +  and determinate +
Jennifer A. Clevinger +
J. R. Allison +
bristlelike +
coroniform +
attenuate +  and rounded +
compound +  and simple +
3 cm30 mm <br />0.03 m <br /> (22 cm220 mm <br />0.22 m <br />) +
lanceolate;ovate +
1 cm10 mm <br />0.01 m <br /> (12 cm120 mm <br />0.12 m <br />) +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
sessile +  and petiolate +
alternate +  and opposite +
Sticky rosinweed +
0.6 cm6 mm <br />0.006 m <br /> (0.85 cm8.5 mm <br />0.0085 m <br />) +
hairy +  and glabrous +
less orbiculate +  and obovate or cuneate +
0.4 cm4 mm <br />0.004 m <br /> (0.7 cm7 mm <br />0.007 m <br />) +
fertile +  and bisexual +
fertile +  and bisexual +
100–300 m +
stipitate-glandular +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Limestone glades, along rocky streams +
in cymiform , corymbiform , paniculiform , racemiform or spiciform , arrays +  and singly +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
1 cm10 mm <br />0.01 m <br /> (3 cm30 mm <br />0.03 m <br />) +
campanulate;hemispheric +
sessile +  and petiolate +
alternate +, subopposite +, opposite +  and whorled +
cauline +  and basal +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
entire +  and toothed +
appressed +  and reflexed +
2-carpellate +
persistent +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Flowering summer–early fall. +
19 +  and 23 +
unequal +  and subequal +
bearing subulate enations +, hairy +  and bristly +
flat;slightly convex +
exalbuminous +
stipitate-glandular +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
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 +
cylindric +
cylindric +
shorter to longer than campanulate +
toothed +  and entire +
20 cm200 mm <br />0.2 m <br /> (250 cm2,500 mm <br />2.5 m <br />) +
fibrous-rooted +  and caulescent +
150 cm1,500 mm <br />1.5 m <br /> (180 cm1,800 mm <br />1.8 m <br />) +