Common Names in English:
Sticky Groundsel, Sticky Ragwort
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.
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.
, biennials, perennials
, or shrubs
, 5-100(-250+) cm (perennating
taprooted, fibrous-rooted, branched caudices, or suberect to creeping
, seldom branched; herbage
, often glabrescent
at flowering) . Stems single or clustered, erect
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
entire or denticulate
to serrate or toothed
(sometimes with relatively many callous
or teeth), faces
glabrous or hairy (usually arachnose to tomentose
, often glabrescent) . Heads (sometimes nodding
) usually radiate
(rarely quasi-disciform), usually in corymbiform
to cymiform, sometimes paniculiform
, 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
, 5-15(-40) mm diam. Phyllaries persistent
, usually ± 5, 8, 13, or 21  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 , pistillate
, 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
sometimes myxogenic) ; pappi usually persistent (fragile), sometimes readily falling, of 30-80+, white to stramineous
. 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.
Species Senecio viscosus
Annuals , (10-) 20-40(-60) cm (taprooted). Herbage densely fetid-viscid (hairs glandular ). Stems single. Leaves evenly distributed; petiolate ; blades obovate to oblong (pinnately dissected to pinnatifid ), 2-7 × 1.5-4 cm, bases tapered or ± truncate , ultimate margins wavy or crenate-dentate (distal leaves sessile, smaller, ± clasping ). Heads (1-) 3-8(-30) in irregular, corymbiform arrays. Calyculi of 2-5 bractlets (largest to 4 mm). Phyllaries (± 13) ± 21, 5-7 mm, tips black. Ray florets ± 13; corolla laminae 1-2 mm (usually coiled , scarcely surpassing phyllaries). Cypselae usually glabrous , sometimes hairy . 2n = 40. [source]
Flowers: Bloom Period: February, March, April, May, June, July, August, September, October. • Flower Color: pale yellow
Size: 12-18" tall.
Disturbed sites, especially open sandy or gravelly places; 1-300 m .
Typically found at an altitude of 0 to 1,422 meters (0 to 4,665 feet).
Sunlight: Sun Exposure: Full Sun .
- Whittaker & Margulis,1978
- Haeckel, 1866
- Cavalier-Smith, 1981
- Sinnott, 1935 ex Cavalier-Smith, 1998
- Vascular Plants
- Brongniart, 1843
- Takhtajan, 1967
- Takhtajan Ex Reveal, 1992
- Lindley, 1833
- Giseke, 1792, nom. cons., nom. alt.
- Tribe: Senecioneae ()
- Subfamily: Asteroideae ()
- Family: Compositae () - Giseke, 1792, nom. cons., nom. alt.
- Order: Asterales () - Lindley, 1833
- Superorder: Campanulanae () - Takhtajan Ex Reveal, 1992
- Subclass: Asteridae () - Takhtajan, 1967
- Class: Magnoliopsida () - Brongniart, 1843 - Dicotyledons
- Subphylum: Euphyllophytina ()
- Phylum: Tracheophyta () - Sinnott, 1935 ex Cavalier-Smith, 1998 - Vascular Plants
- Subkingdom: Viridaeplantae () - Cavalier-Smith, 1981
- Kingdom: Plantae () - Haeckel, 1866 - Plants
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
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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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
- 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
- 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]
- "Senecio viscosus". in Flora of North America Vol. 20 Page 546, 548, 562. Oxford University Press. Online at EFloras.org. [back]
- 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]