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Senecio

 
Dictionary: Se·ne·ci·o
Home > Library > Literature & Language > Webster 1913

n.

[L., groundsel, lit., an old man. So called in allusion to the hoary appearance of the pappus.]
(Bot.) A very large genus of composite plants including the groundsel and the golden ragwort.

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Veterinary Dictionary: Senecio
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A widespread genus of the Asteraceae family. The genus contains more than 1200 species of which at least 25 are known to be poisonous. Some of them are listed here; the toxins are a group of pyrrolizidine alkaloids which cause seneciosis hepatic injury, and the dummy syndrome, jaundice, emaciation and photosensitization; includes S. abyssinicus, S. alpinus, S. biligulatus, S. bipinnatisectus (Australian fireweed), S. braziliensis, S. burchelii, S. cineraria (dusty miller), S. cisplatinus, S. cunninghamii, S. desfontainei, S. desiderabilis, S. erraticus, S. glabellus, S. harvieanus, S. heterotrichus, S. integerrimus, S. integrifolius (fleawort), S. isatideus (Dan's cabbage), S. jacobaea (ragwort, tansy ragwort), S. latifolius, S. lautus, S. linearifolius (S. australis, fireweed), S. longilobus (woolly groundsel), S. madagascariensis (fireweed), S. magnificus (tall yellowtop), S. moorei, S. oxyphyllus, S. plattensis, S. pterophorus (African daisy), S. quadridentatus (cotton fireweed), S. raphanifolius (gantho metho), S. retrorsus (ragwort), S. riddellii (Riddell's groundsel), S. ruwenzoriensis, S. scleratus, S. selloi, S. spartioides (broom groundsel), S. spathulatus, S. squalidus (Oxford ragwort), S. tweediei, S. vernalis, S. vulgaris (groundsel).

Annuals Dictionary: Senecio
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Daisy family
Compositae

Sen-ee'si-o. Groundsel ; Ragwort . Over 2000 species of herbs, shrubs, or small trees, and a few climbers, found throughout the world.

Description
Leaves alternate or basal. This large and diverse genus is difficult to define, the chief difference being in the rings of bracts that surround the head. These do not overlap each other, and the lower bracts are scale-like, giving a calyxlike appearance to the upper ring of bracts. Flowerheads generally yellow, but sometimes purple, red, blue, or white; solitary or in clusters. Heads often showy, composed of ray and disk flowers, but sometimes lacking ray flowers.

How to Grow
Of the 3 species below, S. Cineraria , a warm-weather annual, and S. elegans , a cool-weather annual, can be grown from seeds started early indoors. Do not cover seeds, because they need strong light and heat of 65-70° F (18.5-21.0° C) to germinate. Set out in the garden 2-3 weeks before last frost. These species need full sun and well-drained soil. Senecio - hybridus is difficult to grow, and is successful outdoors only in coastal areas of Calif. Buy plants at the early bloom stage and set out in the garden. Plants in full bloom will not adjust. They prefer cool weather.

Senecio Cineraria
Dusty Miller . To 2 ft. (75 cm) high, covered with long, white, matted hairs. Leaves alternate, thick, cut into narrow, rounded lobes. Flowers yellow or cream, in small terminal clusters. Mediterranean region. Many varieties available, some nearly white. Grown for its foliage. Perennial grown as a half-hardy annual.

Senecio elegans
Purple Ragwort . To 2 ft. (60 cm) high, covered with sticky hairs. Flowerheads to 1 in. (2.5 cm) wide, the rays rosy purple or white, the center yellow; heads in loose branching clusters. South Africa. Also sold as Jacobaea elegans . Many cultivars are available. Perennial grown as a half-hardy annual.

Senecio - hybridus
Cineraria . 1-3 ft. (30-90 cm) high. Flowerheads 2 in. (5 cm) wide, white to reddish pink, blue, or purple, never yellow, some with contrasting rings. Borne in broadly branching clusters. Very variable. This hybrid derives from S. cruentus and S. Heritieri . Tender perennial grown as tender annual.


WordNet: Senecio
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Note: click on a word meaning below to see its connections and related words.

The noun has one meaning:

Meaning #1: enormous and diverse cosmopolitan genus of trees and shrubs and vines and herbs including many weeds
  Synonym: genus Senecio

Wikipedia: Senecio
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Home > Library > Miscellaneous > Wikipedia
"Ragwort" redirects here. For other uses, see Ragwort (disambiguation).
Senecio
Senecio vulgaris, an illustration from 1885.
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Asterales
Family: Asteraceae
Subfamily: Asteroideae
Tribe: Senecioneae
Genus: Senecio
L.
Type species
Senecio vulgaris L.
Species

Some 1500, see text
Synonyms

Dendrosenecio
Jacobaea L.
Culcitium Humb. & Bonpl
S. aureus Golden Ragwort
S. barbertonicus Succulent Bush Senecio
S. haworthii Woolly Senecio
Senecio jacobaea, Common ragwort
Kleinia neriifolia, Verode
Tephroseris palustris, Swamp Ragwort

Senecio (pronounced /sɨˈniːʃi.oʊ/)[1] is a genus of the daisy family (Asteraceae) that includes ragworts and groundsels. The flower heads are normally rayed, completely yellow, and the heads are borne in branched clusters. Senecio is one of the largest genera of flowering plants, and despite the separation of many species into other genera it still contains over 1000 species of varied form, including leaf, stem and tuber succulents, annuals, perennials, aquatics, climbers, shrubs and small trees. Some species produce natural biocides (especially alkaloids) to deter or even kill animals that would eat them.

Senecio species are used as food plants by the larvae of some Lepidoptera species — see list of Lepidoptera that feed on Senecio.

Contents

Selected species

Main article: List of Senecio species

Formerly in Senecio

Synonyms

The following genera contain species that are or have been included within Senecio.[6]

Probable synonyms:


References

  1. ^ Sunset Western Garden Book, 1995:606–607
  2. ^ Sean Claes (2007-04-16). "Proceed With Caution" (HTML). Kyle, Texas Daily Photo. http://kyledailyphoto.blogspot.com/2007_04_01_archive.html#1746781956987590057. Retrieved 2008-04-10. 
  3. ^ Connecticut Botanical Society (November 13, 2005). "Golden Ragwort" (HTML). Connecticut Wildflowers. http://www.ct-botanical-society.org/galleries/packeraaure.html. Retrieved 2008-02-09. "Golden Ragwort is one of three species of ragwort in Connecticut, all with similar flowers." 
  4. ^ M. Grieve (1931). "Ragwort" (HTML). A Modern Herbal. © Copyright Protected 1995–2008 Botanical.com. http://www.botanical.com/botanical/mgmh/r/ragwor02.html. 
  5. ^ "Tansy Ragwort" (HTML). Written Findings of the State Noxious Weed Control Board. Washington State Department of Agriculture. http://www.nwcb.wa.gov/weed_info/Senecio_jacobaea.html. Retrieved 2008-02-09. 
  6. ^ Pelser, Pieter B.; Nordenstam, Bertil; Kadereit, Joachim W.; Watson, Linda E. (November 2007). "An ITS phylogeny of tribe Senecioneae (Asteraceae) and a new delimitation of Senecio L.". Taxon (International Association for Plant Taxonomy (IAPT)) 56 (4): 1077–14E(-1062). http://www.ingentaconnect.com/content/iapt/tax/2007/00000056/00000004/art00009. Retrieved 2008-06-29. 
  7. ^ Norton, D.A. (1986). "Recent changes in the names of New Zealand tree and shrub species". New Zealand Journal of Forestry 31: 39–40. http://www.nzjf.org/free_issues/NZJF31_3_1986/8B94A164-BF7A-4A5B-A45B-3ACE982D0C7C.pdf. 
  8. ^ Germplasm Resources Information Network (GRIN) (2007-05-04). "Genus: Senecio L." (HTML). Taxonomy for Plants. USDA, ARS, National Genetic Resources Program, National Germplasm Resources Laboratory, Beltsville, Maryland. http://www.ars-grin.gov/cgi-bin/npgs/html/genus.pl?11063. Retrieved 2008-02-27. 

External links

Search Wikispecies Wikispecies has information related to: Senecio
Search Wikiversity Wikiversity has bloom time data for Senecio vulgaris on the Bloom Clock

This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)

 
 
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cotton fireweed
dusty miller

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Copyrights:

Dictionary. Webster 1913 Dictionary edited by Patrick J. Cassidy  Read more
Veterinary Dictionary. Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved.  Read more
Annuals Dictionary. Taylor's Guide for Annuals, by Norman Taylor, revised and edited by Gordon P. DeWolf, Jr. Copyright © 1986 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.  Read more
WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved.  Read more
Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Senecio".  Read more