Rhaponticum

subsp. var.
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Standard Cyclopedia of Horticulture

Rhaponticum (old Greek name for rhubarb, the same as occurs in Rheum Rhaponticum). Compositae. Under this generic name at least one species is still catalogued, although the genus is now included as a section of Centaurea. Nine species are recognized in the group, extending from Morocco and Algiers to China. They are more or less thistle-like stout herbs, mostly or entirely perennial, with large solitary yellow, pink or purplish heads, the lvs. usually white-tomentose beneath: florets all equal and perfect: fr. 4-angled; pappus rough or feathery- Two species may be described here, under the genus Centaurea. C. Rhaponticum, Linn. (Rhaponticum scariosum, Lam.). Perennial, 2-2 1/2 ft., with purplish fl.-heads: lvs. tomen- tose beneath, glabrous above, the lower ones ovate or cordate and finely toothed, petiolate, the upper ones sessile and oblong: outer scales of involucre scarious (dry). Alps, Switzerland. B.M. 1752. Appears not to be offered. C. cynarodes, Link (R. cynaroides, Less.). Perennial, from the Pyrenees region: heads few and erect, purplish-fld. : lvs. large, oblong to ovate, attenuate at base, acuminate, the lower ones pinnately parted, the upper scarcely pinnatifid, all the lobes acutely toothed, more or less tomentose beneath: scales of involucre ciliate-serrate.—Listed abroad for outdoor planting. L. H. B. The above text is from the Standard Cyclopedia of Horticulture. It may be out of date, but still contains valuable and interesting information which can be incorporated into the remainder of the article. Click on "Collapse" in the header to hide this text.

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References

• Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963

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