Senecio viscosus

• Interesting Facts
• Common Names
• Description
• Biology
• Taxonomy
• Similar Species
• More Info
• Further Reading
• Notes

Interesting Facts

Common Names

Description

Family Compositae

The largest family of flowering plants , the Compositae (Asteraceae), comprising about 1,100 genera and more than 20,000 species and characterized by many small flowers arranged in a head looking like a single flower and subtended by an involucre of bracts. A head may consist of both ray flowers and disk flowers, as in the sunflower, of disk flowers only, as in the burdock, or of ray flowers only, as in the dandelion.

Tribe Senecioneae

The Senecioneae are a tribe of closely related genera that can be recognized most readily by the nature of the pappus and the involucral bracts or phyllaries. The phyllaries are basically in one well developed, often partially or wholly connate series of equal length that closely envelope the head . Frequently there are a few, very much smaller and mostly randomly distributed, often necrotic-tipped bracts near the base of the main series. The pappus is of fine, soft, often pure white capillary hairs . Heads may be either discoid or radiate . -- Gerald Carr.

Genus Senecio

Annuals , biennials, perennials , subshrubs , or shrubs , 5-100(-250+) cm (perennating bases taprooted, fibrous-rooted, branched caudices, or suberect to creeping rhizomes; roots often fleshy , seldom branched; herbage glabrous or hairy , often glabrescent at flowering) . Stems single or clustered, erect to lax (simple or branched) . Leaves basal and/or cauline; alternate; petiolate or sessile (bases sometimes clasping ) ; blades subpalmately to pinnately nerved, mostly ovate or deltate to oblanceolate , lanceolate, linear , or filiform (and most intermediate shapes ), rarely suborbiculate (sometimes palmately or pinnately lobed to 2-3-pinnatifid), ultimate margins entire or denticulate to serrate or toothed (sometimes with relatively many callous denticles or teeth), faces glabrous or hairy (usually arachnose to tomentose , often glabrescent) . Heads (sometimes nodding ) usually radiate or discoid (rarely quasi-disciform), usually in corymbiform to cymiform, sometimes paniculiform or racemiform , arrays (sometimes from axils of distal leaves), sometimes borne singly. Calyculi usually of 1-8+ bractlets (bractlets often intergrading with distal peduncular bracts, mostly 1 / 5 - 1 / 2 + times phyllaries), sometimes 0. Involucres mostly cylindric or turbinate to campanulate , 5-15(-40) mm diam. Phyllaries persistent , usually ± 5, 8, 13, or 21 [34] in (1-) 2 series, distinct (margins interlocking), erect (often reflexed in fruit), mostly oblong to lanceolate or linear, subequal or equal, margins usually scarious . Receptacles flat to convex , foveolate, epaleate. Ray florets usually ± 5, 8, 13, or 21 [34], pistillate , fertile , sometimes 0; corollas usually yellow, sometimes ochroleucous or white, rarely reddish to purplish (laminae sometimes barely surpassing phyllaries; peripheral pistillate florets usually 0, sometimes 1-8+; corollas usually yellow, sometimes ochroleucous or white) . Disc florets (5-) 13-80+, bisexual , fertile; corollas usually yellow, rarely ochroleucous, white, reddish, or purplish, tubes shorter than to equaling campanulate throats, lobes 5, erect to recurved, usually ± deltate; style branches stigmatic in 2 lines , apices usually truncate-penicillate. Cypselae cylindric or prismatic , usually 5-ribbed or -angled, glabrous or hairy (especially on ribs or angles , hairs sometimes myxogenic) ; pappi usually persistent (fragile), sometimes readily falling, of 30-80+, white to stramineous , barbellulate to smooth bristles . x = 10.

Species 1000+: nearly worldwide, mostly in warm-temperate, subtropical , and tropical regions at mid and upper elevations .

The concept of Senecio in traditional North American floristics stems from nineteenth century botanists who saw the genus as a diverse assemblage held together by similar morphologies of the heads and florets . Studies in the past two decades have shown Senecio in the broad sense to be a collection of separate lineages ; a better taxonomy is to be had by treating the lineages as genera. Some of the lineages were recognized in the past as infrageneric assemblages. A treatment of Senecio by T. M. Barkley (1978) reflected the traditional circumscription of the genus; a narrower circumscription is used here. Present concepts, plus a catalogue of genera, were presented by Barkley (1999) .The "species-groups" recognized here are given names purely as a matter of convenience; the groups and their names are intentionally given no formal taxonomic status (T. M. Barkley 1978) . Some of the groups may represent natural evolutionary alliances ; that remains to be clarified.The following taxa are not established members of the flora but are nonetheless noteworthy:Senecio brasiliensis (Sprengel) Lessing var. tripartitus (de Candolle) Baker is a South American weed of disturbed sites, introduced on the Gulf Coast near Pensacola, Florida, in 1893-1894. Its presence was discussed by J. M. Greenman (1917) and by L. J. Uttal (1982), both of whom treated it as Senecio canabinaefolius Hooker & Arnott. It is toxic to livestock; it seems not to have persisted in the flora.Senecio bicolor (Willdenow) Viviani (S. cineraria de Candolle) is one of the plants called "dusty miller" in the horticultural trade. It occasionally persists in the flora after cultivation.Species of the African genus Euryops are commonly cultivated in California and Florida and, to a lesser extent, in other warm areas of the flora. They would key here to Senecio. They are shrubs with leaves dissected or prominently toothed, phyllaries connate for the proximal third of their lengths , and yellow corollas. Apparently none persist for long after cultivation.Relatively recent collections from low-lying (50-100 m ), seasonally wet, disturbed areas in Orange and San Diego counties, California, have included semi-weedy perennial herbs or subshrubs 100-200 cm that are initially arachnose to tomentose, soon glabrescent, and have oblanceolate to linear or filiform leaves (2-7 cm), notably small heads in corymbiform arrays, ± 13 phyllaries 3-4 mm, and 7-8 ray florets with corolla laminae 2-3 mm. G. L. Nesom (pers. comm. ) has suggested that these plants are Senecio linearifolius A. Richard, a native of Australia and Tasmania.References to shapes, sizes, bases, margins, induments , etc. , of "leaves" in keys and descriptions refer to principal (largest, most conspicuous ) leaves at flowering unless otherwise indicated.[1]

Physical Description

Habitat

Disturbed sites, especially open sandy or gravelly places; 1-300 m [2].

Typically found at an altitude of 0 to 1,422 meters (0 to 4,665 feet).[3]

Biology

Reproduction

Duration: Annual

Growth

Sunlight: Sun Exposure: Full Sun .

Taxonomy

Notes

Name Status: Accepted Name .

Comment: Data Providers: New Zealand Plant Name Database, IPNI, Tropicos, Euro+Med. GCC LSID: urn :lsid:compositae.org:names:D012C7B2-69E1-45EC-A440-5F9841D6FB19

Last scrutiny: 18-Aug-09

Similar Species

Members of the genus Senecio

ZipcodeZoo has pages for 174 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them:

Myrica pennsylvanica (Northern Bayberry) · Myrica pensylvanica 'Morton' (Silver Sprite Bayberry) · S. acaulis (Senecio) · S. actinella (Flagstaff Ragwort) · S. amplectens (Alpine Groundsel) · S. amplectens holmii (Holm's Groundsel) · S. amplectens var. amplectens (Showy Alpine Ragwort) · S. amplectens var. holmii (Holm's Groundsel) · S. ampullaceus (Texas Groundsel) · S. angulatus (Climbing Groundsel) · S. anteuphorbium (Senecio) · S. aphanactis (Chaparral Ragwort) · S. aquaticus (Water Ragwort) · S. arborescens (Estrella) · S. arizonicus (Arizona Ragwort) · S. aronicoides (Rayless Ragwort) · S. articulatus (Candle Plant) · S. aschenborianus (Senecio) · S. astephanus (San Gabriel Ragwort) · S. atratus (Tall Blacktip Ragwort) · S. aurea (Golden Groundsel) · S. ballyi (Senecio) · S. bellidioides (Alpine Groundsel) · S. bicolor (Silver Ragwort) · S. bicolor cineraria (Dusty Miller) · S. bigelovii (Nodding Groundsel) · S. bigelovii Gray var. hallii Gray (Nodding Ragwort) · S. bigelovii var. bigelovii (Biglow's Ragwort) · S. bigelovii var. hallii (Hall's Ragwort) · S. blochmaniae (Dune Ragwort) · S. bolanderi var. bolanderi (Bolander's Ragwort) · S. californicus (California Ragwort) · S. cannabifolius (Aleutian Ragwort) · S. cannabinifolius (Hempleaf Ragwort) · S. cineraria 'Cirrus' (Cirrus Dusty Miller) · S. cineraria 'Silver Dust' (Dusty Miller) · S. clarkianus (Clark's Ragwort) · S. clivorum (Summer Ragwort) · S. confusus 'Sao Paulo' (Mexican Flame Vine) · S. congestus (Clustered Marsh Ragwort) · S. crassifolius (Senecio) · S. crassissimus (Vertical Leaf Senecio) · S. crassulus (Meadow Groundsel) · S. cristobalensis (Senecio) · S. cylindricus (Senecio) · S. dangarensis (Largescaled Rasbora) · S. deflersii (Pickle Plant) · S. dimorphophyllus var. dimorphophyllus (Splitleaf Groundsel) · S. dryadens (Longnose Tapirfish) · S. elegans (Purple Groundsel) · S. elmeri (Elmer's Ragwort) · S. eremophilus (Desert Groundsel) · S. eremophilus var. eremophilus (Desert Ragwort) · S. eremophilus var. kingii (Ragwood Groundsel) · S. eremophilus var. macdougalii (Macdougal's Groundsel) · S. ertterae (Ertter's Ragwort) · S. erucifolius (Hoary Ragwort) · S. erucifolius erucifolius (Hoary Groundsel) · S. eurycephalus Torr. & A.Gray var. eurycephalus Torr. & A.Gray ex A.Gray (Widehead Groundsel) · S. eurycephalus var. eurycephalus (Siskiyou Ragwort) · S. ficoides (Senecio) · S. flaccidus (Douglas Senecio) · S. flaccidus var. douglasii (Douglas' Groundsel) · S. flaccidus var. flaccidus (Threadleaf Groundsel) · S. flaccidus var. monoensis (Green Groundsel) · S. fremontii (Dwarf Mountain Ragwort) · S. fremontii var. blitoides (Dwarf Mountain Ragwort) · S. fremontii var. fremontii (Dwarf Mountain Ragwort) · S. fremontii var. inexpectatus (Dwarf Mountain Ragwort) · S. fremontii var. occidentalis (Dwarf Mountain Ragwort) · S. glastifolius (Holly-Leaved Senecio) · S. gunnii (Mountain Fireweed) · S. haworthii (Senecio) · S. herreanus (String of Beads Cactus) · S. herreianus (Gooseberry) · S. hispidulus (Hispid Fireweed) · S. hybridus (Common Ragwort) · S. hydrophiloides (Tall Groundsel) · S. hydrophilus (Alkali Marsh Groundsel) · S. hypoleucus (Pale Groundsel) · S. inaequidens (Narrow-Leaved Ragwort) · S. integerrimus (Columbia Ragwort) · S. integerrimus Nutt. var. exaltatus (Nutt.) Cronq. (Columbia Groundsel) · S. integerrimus var. exaltatus (Columbia Groundsel) · S. integerrimus var. integerrimus (Lambstongue Ragwort) · S. integerrimus var. major (Lambstongue Groundsel) · S. integerrimus var. ochroleucus (Paleyellow Ragwort) · S. integerrimus var. scribneri (Scribner's Ragwort) · S. jacobaea (Ragwort) · S. jacobaea dunensis (Ragwort) · S. jacobaea jacobaea (Ragwort) · S. jacobsenii (Trailing Jade) · S. kirkii (Tree Daisy) · S. kleinia (Mountain Grass) · S. kleiniaeformis (Spear Head) · S. kleiniiformis (Spearhead) · S. lamarckianus (Bois De Ch) · S. lemmonii (Lemmon Groundsel) · S. linearifolius (Fireweed) · S. littoralis (Woolly Ragwort)

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Further Reading

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Notes

Contributors

• Brands, S.J. (comp.) 1989-present. The Taxonomicon. Universal Taxonomic Services, Zwaag, The Netherlands. Accessed January 10, 2012.

Data Sources

Accessed through GBIF Data Portal November 11, 2007:

• Botanic Garden and Botanical Museum Berlin-Dahlem, GEO Biodiversity Day
• Jyväskylä University Museum - The Section of Natural Sciences, Vascular plant collection of Jyvaskyla University Museum
• Museum of Natural History, Wroclaw University, Museum of Natural History, Wroclaw University, Flora of the Stołowe Mts.
• Natural History Museum, University of Oslo, Vascular Plant Herbarium, Oslo
• Natural History Museum, University of Oslo, Vascular Plants, Field notes, Oslo
• Steiermärkisches Landesmuseum Joanneum - Herbarium GJO, Herbarium GJO
• SysTax, Herbarium Universitat Ulm
• SysTax, Justus-Liebig-Universitat Giessen
• SysTax, Museu Botanico Municipal
• The Danish Biodiversity Information Facility, Botany registration database by Danish botanists
• The Swedish Museum of Natural History
• , Botany
• The Swedish Museum of Natural History
• , Herbarium of Oskarshamn
• The Swedish Museum of Natural History
• , Lund Botanical Museum
• The Swedish Museum of Natural History
• , Plants
• Tiroler Landesmuseum Ferdinandeum, Tiroler Landesmuseum Ferdinandeum
• UK National Biodiversity Network, Environment and Heritage Service - EHS Species Datasets
• UK National Biodiversity Network, Joint Nature Conservation Committee - Vegetation surveys of coastal shingle in Great Britain
• University of Alaska Museum of the North, University of Alaska Museum of the North Herbarium
• University of Vienna, Institute for Botany - Herbarium WU, Herbarium WU

Identifiers

• Biodiversity Heritage Library NamebankID: 2657710
• Catalogue of Life Accepted Name Code: Ast-8151
• Global Biodiversity Information Facility Taxonkey: 5884651
• Globally Unique Identifier: urn:lsid:ipni.org:names:248231-1
• GRIN Nomen Number: 401844
• Integrated Taxonomic Information System (ITIS) Taxonomic Serial Number (TSN): 36193
• U.S.D.A. Plant Symbol: SEVI2
• Zipcode Zoo Species Identifier: 62675

Footnotes

1. Theodore M. Barkley "Senecio". in Flora of North America Vol. 20 Page 540,541, 542, 543, 544, 545, 570, 615. Oxford University Press. Online at EFloras.org. [back]
2. "Senecio viscosus". in Flora of North America Vol. 20 Page 546, 548, 562. Oxford University Press. Online at EFloras.org. [back]
3. Mean = 128.110 meters (420.308 feet), Standard Deviation = 160.470 based on 8,325 observations. Altitude information for each observation from British Oceanographic Data Centre. [back]

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