Silphium terebinthinaceum - (image 1 of 7)
Taxonomy
Family: Asteraceae
Habitat
Prairies. Marl flats.
Associates
In prairies the associates are similar to those of S. laciniatum. In marl flats with Cladium mariscoides, Deschampsia caespitosa glauca, Eleocharis rostellata, Juncus brachycephalus, Lobelia kalmii, Parnassia glauca, Potentilla fruiticosa, Scleria verticillata, Solidago ohioensis, Solidago patula, Tofieldia glutinosa, Tricglochin palustris.
Distribution
Southern Ontario and OH west to MN, south to GA and MS.
Morphology
Coarse, taprooted perennial, to 12' high. Leaves almost all basal, very large, mostly deltoid-ovate or ovate-oblong, sharply toothed, to 12" long; cauline leaves, if present, much reduced. Stems glabrous or glabrate. Heads several to numerous in an open-corymbiform inflorescence, relatively large; rays yellow, 13-21; disk to 3.5 cm wide; involucral bracts glabrous, strongly imbricate, the outer broadly elliptic, the inner elongate, more oblong, loose and broad-tipped. Fruit an achene.
Notes
Flowers late June to late September
Wetland indicator: Facultative Upland
Will bloom 2 or 3 years after planting from seed.
References
Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of
Northeastern United States
and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY
Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.
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Michael Hough © 2005 |