Conyza canadensis var. pusilla

ClassificationDicots
FamilyAsteraceae
Family (Traditional)Asteraceae
GenusConyza
Species: Conyza canadensis
Infrapecies:Conyza canadensis (Nutt.) Cronquist var. pusilla
Common NameBarrilla; Canadian Horseweed
Growth Habitforb
Plant Notes**
CharacteristicsArmaments: No; Milky Sap: No; Photosynthetic: Yes; Stipules: No; Woody Herbaceous: Herbaceous; Duration: Annual; General Ecology: Terrestrial; Growth Habit: forb; Region of Origin: North America; Reproductive Phenology: July; Reproductive Phenology: August; Reproductive Phenology: September; Reproductive Phenology: October; Leaf Arrangement: alternate; Leaf Complexity: simple; Leaf Dissection: 0; Leaf Fragrance: No; Leaf Persistance: Deciduous; Leaf Petiole Type: sessile; Leaf Type: broadleaf; Leaf Venation: pinnate; Leaflet Margins: ciliate; Leaflet Margins: entire; Leaflet Number: 0; Anther Type: Basifixed; Base Flower Color: White; Carpel Number/Pistil: 1; Fruit Complexity: Simple; Fruit Dehiscence: No; Fruit Type: Cypsela; Fruit Wet/Dry: Dry; Hypanthium Present: No; Inflorescence Position: terminal; Inflorescence Types: corymb/cyme/umbel; Inflorescence Types: head; Ovary Position: Inferior; Overall Flower Symmetry: Actinomorphic; Ovules per Carpel: 1; Perianth Present: Yes; Petal Fusion: Yes; Petal Number: 5; Pistil Complexity: Simple; Pistil Number: 1; Placentation Type: Basal; Sepal Fusion: N/A; Sepal Number: N/A; Sexuality: monoclinous; Sporangium Arrangement: N/A; Stamen Number: 5; Tepal Number: N/A
C value 8
StatusNative; TN[SNR] KY[SNR] (State Rank); G5T5 (Global Rank)
Specimen(s) View and Download Specimen Details »

** Not applicable or data not available.

Currently no photos are available for this plant.

Species Distribution Map

This species has been reported in the counties highlighted in the interactive distribution map below. Click on a county to display the its name. Click the question mark icon () to view additional information about the ecoregions shown. In the map legend, there are links to toggle the visibility of the ecoregions and/or their labels. In addition, clicking on an ecoregion name will highlight that region on the map.

  • State Boundaries
  • Counties
  • Counties - Species Present
Ecoregions
  • Southeastern Plains
    • Blackland Prarie
  • Blue Ridge Mountains
  • Ridge and Valley
  • Cumberland Plateau
  • Cumberland Mountains
  • Allegheny Plateau
  • Interior Plateau
    • Bluegrass Region
    • Nashville Basin
    • Pennyroyal Karst Plain
    • Western Highland Rim
    • Eastern Highland Rim

Synonyms

SynonymFull Citation
Conyza parva Conyza parva Cronq.
Erigeron canadensis var. pusillus Erigeron canadensis var. pusillus (Nutt.) Boivin, non Ahles
Erigeron pusillus Erigeron pusillus Nutt.
Leptilon pusillum Leptilon pusillum (Nutt.) Britt.

Specimens and Distribution

This species has been reported in the following counties by the herbaria listed. An overview of the individual specimens are provided in the table that follows. Click on the accession number to view details; click on column headers to sort.

Counties included on distribution map: McCreary (KY), Pulaski (KY), Cheatham (TN), Montgomery (TN), Stewart (TN)

Herbaria represented by specimen data listed below: APSC

Range of years during which specimens were collected: 1993 - 1993

Accession No. (click for full details) County State Coll. Date Collector &
Collection No.
Herbarium &
Herbarium Name Used
APSC0078627 McCreary Kentucky
APSC
Erigeron pusillus
APSC0032877 Cheatham Tennessee
APSC
Erigeron pusillus
APSC0026939 Stewart Tennessee
APSC
Erigeron pusillus
APSC0026974 Montgomery Tennessee
APSC
Erigeron pusillus
APSC0071288 Pulaski Kentucky 20 Sep 1993 Max Medley
APSC
Erigeron pusillus
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