View source for Silphium

{{SPlantbox
|familia=Asteraceae
|genus=Silphium
|lifespan=perennial
|life_ref=Flora - A Gardener's Encyclopedia
|Temp Metric=°F
|jumpin=If this plant info box on watering; zones; height; etc. is mostly empty you can click on the edit tab and fill in the blanks!
|image=Silphium head.JPG
|image_width=240
}}
'''Rosinweed''' ('''''Silphium''''') is a genus of about 20 species of [[flowering plant]]s in the family [[Asteraceae]], native to eastern [[North America]]. They are [[herbaceous]] [[perennial plant]]s growing to 0.5-4&nbsp;m tall, with yellow (rarely white) flowerheads. The name of the genus comes from the [[Ancient Greek]] word for a North African plant whose identity has been lost, though we know its gum or juice was prized by the ancients as a medicine and a condiment.<ref>[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=130361 Flora of North America]</ref>

{{Inc|
Silphium (from the Greek name of an umbelliferous plant of northern Africa). Compositae. Rosinweed. Tall-growing hardy perennial herbs native of the United States which are grown for their rather large sunflower-like heads of flowers which, except in one species, are yellow.

Leaves opposite, alternate or verticillate, often forming water-holding cups by perfoliation of the st.: heads many-fld.; involucre of thick, somewhat foliaceous bracts; ray-fls. or at least their ovaries in more than 1 series, fertile, and with elongated exserted deciduous ligules: achenes much flattened, falling free or only with the subtending bract.—About 25 species. Silphiums are of easy cult. in any good soil. They require full sunlight and are prop. by division or seed.
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==Cultivation==


===Propagation===


===Pests and diseases===


==Species==
*''[[Silphium albiflorum]]'' A.Gray – White Rosinweed
*''[[Silphium asteriscus]]'' L. – Starry Rosinweed
*''[[Silphium brachiatum]]'' Gatt. – Cumberland Rosinweed
*''[[Silphium compositum]]'' Michx. – Kidneyleaf Rosinweed
*''[[Silphium glutinosum]]'' J.R.Allison – Sticky Rosinweed
*''[[Silphium gracile]]'' A.Gray – Slender Rosinweed
**''Silphium radula'' Nutt. var. ''gracile'' (A.Gray) Clevinger
*''[[Silphium integrifolium]]'' Michx. – Wholeleaf Rosinweed
*''[[Silphium laciniatum]]'' L. – Compassplant
*''[[Silphium mohrii]]'' Small  – Mohr's Rosinweed
*''[[Silphium perfoliatum]]'' L. – Cup Plant
*''[[Silphium perplexum]]'' J.R.Allison – Old Cahaba Rosinweed
*''[[Silphium pinnatifidum]]'' Ell. – Tansy Rosinweed
**''Silphium terebinthinaceum'' Jacq. var. ''pinnatifidum'' (Elliott) A.Gray
*''[[Silphium radula]]'' Nutt. – Roughstem Rosinweed
*''[[Silphium reverchonii]]'' Bush – Reverchon's Rosinweed
*''[[Silphium scaberrimum]]'' Ell. – Roughleaf Rosinweed
*''[[Silphium simpsonii]]'' Greene – Simpson's Rosinweed
*''[[Silphium terebinthinaceum]]'' Jacq. – Prairie Rosinweed, Prairie Dock
*''[[Silphium trifoliatum]]'' L. – Whorled Rosinweed
*''[[Silphium wasiotense]]'' M.Medley – Appalachian Rosinweed
Sources: FNA,<ref name="FNA">[http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=130361]</ref> IPNI,<ref name="IPNI-search">[http://www.ipni.org/ipni/plantnamesearchpage.do International Plant Names Index]</ref> NRCS,<ref name="NRCS">NRCS Plants Profile</ref> GRIN,<ref name="GRIN">[http://www.ars-grin.gov/cgi-bin/npgs/html/genus.pl?11161 Germplasm Resources Information Network]</ref> ITIS,<ref name="ITIS"/> UniProt<ref name="UniProt"/>

==Gallery==

<gallery perrow=5>
File:Silphium integrifolium compressed.JPG| photo 1
Image:Upload.png| photo 2
Image:Upload.png| photo 3
</gallery>

==References==
<references/>
<!--- xxxxx  *Flora: The Gardener's Bible, by Sean Hogan. Global Book Publishing, 2003. ISBN 0881925381  -->
<!--- xxxxx  *American Horticultural Society: A-Z Encyclopedia of Garden Plants, by Christopher Brickell, Judith D. Zuk. 1996. ISBN 0789419432  -->
<!--- xxxxx  *Sunset National Garden Book. Sunset Books, Inc., 1997. ISBN 0376038608  -->

==External links==
*{{wplink}}

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