Onoseris

Plant Characteristics

Cultivation

Scientific Names

Onoseris >

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Read about Onoseris in the Standard Cyclopedia of Horticulture

Onoseris (asses' salad; significance not evident). Including Isotypus. Compositae. Some twenty herbs or shrubs, mostly Andean, but also in Mexico and southeastern Brazil, grown rarely indoors and out for the large purple, pinkish or white flower-heads; allied to Mutisia, but it has no close relatives of much horticultural importance. Plants of various habit, mostly erect, sometimes annual, some species almost stemless: Lvs. radical and cauline, white-tomentose beneath: heads large, heterogamous, solitary or panicled, the peduncles or scapes usually long and more or less bracted; ray-florets pistillate in one series (heads discoid in O. Isotypus); disk- florets usually hermaphrodite and fertile; involucre hemispherical or top-shaped, the bracts linear, imbricate and in many series, the exterior ones gradually shorter.—They appear to require no special cult, treatment; prop, by seeds. O. adpressa, Less. (Centroclinium adpressum, Hook.). Little shrub, blooming under cult, at 1 and 2 ft., with woolly branches: Lvs. lanceolate, reflexed, 3 in. or more long, nearly entire but undulate: peduncle solitary and terminal or becoming lateral by elongation of other shoots; head solitary, large, fragrant; rays long and narrow, about H, rose-purple. Peru. B.M. 3115.—O. Drakeana, Andre. Woody, little branched, often weak: Lvs. alternate, ovate, lanceolate or hastate, entire or shallowly dentate: peduncles scape-like, 1-headed, with few bracts: rays violet, about 20, showy. Colombia. R.H. 1883:180.—O. lsotypus, Benth. & Hook. (Isotypus onoseroides, HBK. Caloseris rupestris, Benth.). Showy shrub ft. high, the branches white-Innate: Lvs. long-petioled. .large, broadly hastate-cordate, 5-8 in. long, acute, sinuate-lobed and dentate, 3-5-ncrved, the petioles 6-10 in. long: heads about 1 in. long in a terminal panicle, the corolla red and scarcely exceeding the involucre. 8. Mex. Guatemala. G.W. 12, p. 11.—O. purpurata, Willd. Nearly stemless perennial: Lvs. radical, lyrate, the terminal lobe large and deltoid-hastate and dentate: scape branched at middle, 3-headed, the rays purple and short. Colombia.—O. reflexa. Less. (Centroclinium reflexum, Hook.). Woolly branched, about 2 ft., probably annual: Lvs. ovate-lanceolate. 2-3 in. long, coarsely toothed and acute: peduncle solitary, terminal or from upper axils, with many small bracts: heads large and handsome, fragrant; rays 9-12, very narrow, rose-purple. Peru. B.M. 3114. 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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