CPC Plant Profile: Quayle's Ragwort
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Plant Profile

Quayle's Ragwort (Senecio quaylei)

Description
  • Global Rank: G1 - Critically Imperiled
  • Legal Status: N/A
  • Family: Asteraceae
  • State: TX
  • Nature Serve ID: 131672
  • Date Inducted in National Collection: 12/01/2021

Annual, 8-12 dm tall, glabrous throughout or with a few inconspicuous hairs on the peduncles and phyllaries. Stems single, striate, the proximal third 10-1 5 mm in diameter, narrower distally, hollow, with a conspicuous reddish subepidermal layer when freshly cut; arising from a short, thin taproot surrounded by abundant, thin and sparingly branched fibrous roots. Basal and proximal cauline leaves with blades ovate, mostly 12-24 cm long and 8-12 cm wide, margins wavy, with a few scattered minute denticles, midvein prominent and lateral veins less conspicuous in dried specimens, tapering or gently contracted to a distinct petiole, ca. 2/3 the length of the blade. Middle cauline leaves with blades nearly as large as the basal leaves, ovate to broadly lanceolate, sessile and clasping . Distal cauline leaves lanceolate to linear-lanceolate, 6-14 cm long, sessile, the distal most further reduced and bractlike. Capitulescences terminal or arising from the axils of the upper leaves;fundamentally corymbiform cymes of 20-40 capitula, or a close cluster of corymbiform cymules. Involucres cylindrical or turbinate to weakly cam- panulate, each subtended by a weakly defined calyculus of 2-7 linear bracteoles, 1-3 mm long, margins hairy. Phyllaries mostly 1 3, 8 mm long, green with hyaline margins, abaxial surfaces with short hairs distally, the apex with a minute tuft of hyaline hairs. Corollas yellow. Ray florets mostly 8, pistillate; corollas ca. 1 1 mm long, tubes 4 mm and laminae ca. 7 mm long, 2.5 mm wide. bisexual;corollas 7( 1 0) mm long, tube and limb (including lobes) of about equal length, corolla lobes triangular, 0.5 mm long . Cypselae not seen, oldest ovaries wrinkled, empty, 1 -3 mm long, pubescent through- out. Pappus of abundant white, minutely barbellate bristles in a single series, 6-7 mm long. Chromosome number unknown.

Participating Institutions
Updates
Nature Serve Biotics
  • 05/02/2017

According to Barkley (2000), it is unclear whether the occurrence of this plant in Texas is as an exotic waif or as a rare member of the regional flora, known thus far from one small occurrence in a roadside ditch. Texas Heritage (Jan. 2001) treats as native, and hence endemic.

Kim Taylor
  • 01/01/2010

Known from a single occurrence of about 15 individuals (Barkley 2000).

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Photos
Nomenclature
Taxon Senecio quaylei
Authority T.M. Barkley
Family Asteraceae
CPC Number 44839
ITIS 780503
USDA SEQU3
Common Names Quayle's ragwort
Associated Scientific Names Senecio quaylei
Distribution Known from a single occurrence in Tarrant County, Texas
State Rank
State State Rank
Texas S1
Habitat

Roadside ditch.

Ecological Relationships

Pollinators
Common Name Name in Text Association Type Source InteractionID

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