Difference between revisions of "Helenium"
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Helenium (possibly from Helenus, the son of Priam, but there is no clear record of the application of the name). Compositae. Sneeze Weed. Hardy annual and perennial herbs, bearing yellow flowers from early summer to late autumn; only the perennials are in cultivation. | Helenium (possibly from Helenus, the son of Priam, but there is no clear record of the application of the name). Compositae. Sneeze Weed. Hardy annual and perennial herbs, bearing yellow flowers from early summer to late autumn; only the perennials are in cultivation. | ||
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Stem erect, usually branching above: lvs. alternate, narrowly to broadly lanceolate, entire or toothed, glandular-dotted; the frequently decurrent petiole and st. sometimes winged: heads solitary or corymbose, yellow or brownish; disk-fls. perfect, fertile, their corollas 4-5-toothed; the ray-fls. pistillate or neutral, the rays wedge-shaped, 3-5-lobed. — About 30 species, N. Amer., Mex. Closely resembles Helianthus, but differs in having elongated, often top-shaped frs., which are never compressed and are usually silky villose; while the frs. of Helianthus are generally more or less 4- sided and are smooth. In Helenium the receptacle is naked; in Helianthus it bears paleaceous bracts. | Stem erect, usually branching above: lvs. alternate, narrowly to broadly lanceolate, entire or toothed, glandular-dotted; the frequently decurrent petiole and st. sometimes winged: heads solitary or corymbose, yellow or brownish; disk-fls. perfect, fertile, their corollas 4-5-toothed; the ray-fls. pistillate or neutral, the rays wedge-shaped, 3-5-lobed. — About 30 species, N. Amer., Mex. Closely resembles Helianthus, but differs in having elongated, often top-shaped frs., which are never compressed and are usually silky villose; while the frs. of Helianthus are generally more or less 4- sided and are smooth. In Helenium the receptacle is naked; in Helianthus it bears paleaceous bracts. | ||
| − | Heleniums thrive best in a rich, moist soil, with a sunny aspect, and are propagated by seeds, cuttings or division. All the species are very easily grown, the only serious difficulty being a white aphis which sometimes attacks the roots. If plants look unhealthy they should be lifted, washed with an insectiside and reset in a new place. The commonest species in cult, is H. autumnale, put perhaps the most valuable species for general planting is H. hoopesii, which is one of our earliest blooming composites, and is also desirable for the border or for cut-flowers. H. hoopesii, H. bolanderi and H. autumnale will give bloom in succession from May to October. The first two are also attractive when grown in pots, but they do not flower from seed the first year, either in pots or in the open. | + | Heleniums thrive best in a rich, moist soil, with a sunny aspect, and are propagated by seeds, cuttings or division. All the species are very easily grown, the only serious difficulty being a white aphis which sometimes attacks the roots. If plants look unhealthy they should be lifted, washed with an insectiside and reset in a new place. The commonest species in cult, is H. autumnale, put perhaps the most valuable species for general planting is H. hoopesii, which is one of our earliest blooming composites, and is also desirable for the border or for cut-flowers. H. hoopesii, H. bolanderi and H. autumnale will give bloom in succession from May to October. The first two are also attractive when grown in pots, but they do not flower from seed the first year, either in pots or in the open.}} |
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==Cultivation== | ==Cultivation== | ||
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==Species== | ==Species== | ||
| − | + | H. douglasii, Hort.=Monolopia major.—H. tenuifolium, Nutt. Annual. A weed in the S. Atlantic and southwestern states. St. 8 in. to 2 ft. high, very leafy: lvs. thread-like, entire, sessile, often whorled. Va., Fla., west to Mo. and Texas.{{SCH}} | |
==Gallery== | ==Gallery== | ||
Latest revision as of 04:48, 20 October 2009
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Helenium > |
Describe the plant here...
Read about Helenium in the Standard Cyclopedia of Horticulture
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Helenium (possibly from Helenus, the son of Priam, but there is no clear record of the application of the name). Compositae. Sneeze Weed. Hardy annual and perennial herbs, bearing yellow flowers from early summer to late autumn; only the perennials are in cultivation. Stem erect, usually branching above: lvs. alternate, narrowly to broadly lanceolate, entire or toothed, glandular-dotted; the frequently decurrent petiole and st. sometimes winged: heads solitary or corymbose, yellow or brownish; disk-fls. perfect, fertile, their corollas 4-5-toothed; the ray-fls. pistillate or neutral, the rays wedge-shaped, 3-5-lobed. — About 30 species, N. Amer., Mex. Closely resembles Helianthus, but differs in having elongated, often top-shaped frs., which are never compressed and are usually silky villose; while the frs. of Helianthus are generally more or less 4- sided and are smooth. In Helenium the receptacle is naked; in Helianthus it bears paleaceous bracts. Heleniums thrive best in a rich, moist soil, with a sunny aspect, and are propagated by seeds, cuttings or division. All the species are very easily grown, the only serious difficulty being a white aphis which sometimes attacks the roots. If plants look unhealthy they should be lifted, washed with an insectiside and reset in a new place. The commonest species in cult, is H. autumnale, put perhaps the most valuable species for general planting is H. hoopesii, which is one of our earliest blooming composites, and is also desirable for the border or for cut-flowers. H. hoopesii, H. bolanderi and H. autumnale will give bloom in succession from May to October. The first two are also attractive when grown in pots, but they do not flower from seed the first year, either in pots or in the open. 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. |
Cultivation
Propagation
Pests and diseases
Species
H. douglasii, Hort.=Monolopia major.—H. tenuifolium, Nutt. Annual. A weed in the S. Atlantic and southwestern states. St. 8 in. to 2 ft. high, very leafy: lvs. thread-like, entire, sessile, often whorled. Va., Fla., west to Mo. and Texas.CH
Gallery
If you have a photo of this plant, please upload it! Plus, there may be other photos available for you to add.
photo 1
photo 2
photo 3
References
- Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963
External links
- w:Helenium. Some of the material on this page may be from Wikipedia, under the Creative Commons license.
- Helenium QR Code (Size 50, 100, 200, 500)
