Pseudoconyza viscosa (Mill.) D'Arcy

First published in Phytologia 25: 281 (1973)
This species is accepted
The native range of this species is Tropics & Subtropics. It is an annual or biennial and grows primarily in the seasonally dry tropical biome. It is used to treat unspecified medicinal disorders, as a medicine, has environmental uses and for food.


Biogeografic region: Caribbean. Elevation range: 10–200 m a.s.l. Native to Colombia. Colombian departments: Atlántico, Bolívar, Boyacá, Magdalena.

Compositae, H. Beentje, C. Jeffrey & D.J.N. Hind. Flora of Tropical East Africa. 2005

Morphology General Habit
Annual herb 0.3–1.2 m tall, sometimes woody at base; stems pilose with long slender hairs and short glandular hairs.
Morphology Leaves
Leaves aromatic, (narrowly) obovate and often lobed, sessile or with a winged petiole, 2–5 cm long, 0.8–3 cm wide (occasionally basal leaves to 16 cm long and 7 cm wide, rarely also large leaves at branch bases), base auriculate with small, narrowly ovate auricles, sometimes decurrent in two lines of lobes similar to the auricles, margins irregularly serrate and often blade pinnatifid proximally, apex acute, pilose and glandular on both surfaces.
Morphology Reproductive morphology Inflorescences Capitulum
Capitula 6–9 mm long, in lax leafy corymbs of several to many heads; stalks of individual capitula 2–20 mm long; phyllaries subequal, the outermost smallest, 2–8 mm long, 0.5–1.2 mm wide, margins scarious and ciliate, acute, pubescent and glandular.
Morphology Reproductive morphology Flowers Florets
Outer florets white to pinkish, 180–280, tube filiform, 3.7–4.2 mm long, minutely toothed; style 4.3–4.6 mm long with glabrous branches; inner florets pinkish purple, 6–12, tube 4–5 mm long, widening only slightly, lobes 0.3–0.5 mm long, glandular; anthers 1.5–1.8 mm long, with very short tails and short ovate distal appendages; style 4.5–5.2 mm long with short papillose branches.
Morphology Reproductive morphology Fruits
Achenes cylindrical, 0.7–1 mm long, pubescent; pappus of white barbellate bristles 4–5 mm long.
Fig. 72 (page 358).
Moist sites along rivers, in forest, also a weed of cultivation; 1–1350 m
K1 K3 K4 K7 T1 T2 T3 T4 T5 T6 T7 T8 U1 a widespread weed of the tropics and subtropics, but uncommon in our area

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E.

Predicted extinction risk: not threatened. Confidence: confident

Found in Boyacá, Colombia.

The Useful Plants of Boyacá project

Morphology General Habit
Not Evaluated.
Introduced in Colombia.
Alt. 10 - 200 m.

Bernal, R., Gradstein, S.R. & Celis, M. (eds.). 2015. Catálogo de plantas y líquenes de Colombia. Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá.

Adventicia en Colombia; Alt. 10 - 200 m.; Llanura del Caribe.
Morphology General Habit
No Evaluada


Use Environmental
Environmental uses.
Use Food
Used for food.
Use Materials
Used as material.
Use Medicines
Medical uses.

Use Medicines Unspecified Medicinal Disorders
Medicinal (State of the World's Plants 2016).


  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
  • Catálogo de Plantas y Líquenes de Colombia

  • Flora of Tropical East Africa

    • Flora of Tropical East Africa
  • Herbarium Catalogue Specimens

    • Digital Image © Board of Trustees, RBG Kew
  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at and
    • © Copyright 2023 World Checklist of Vascular Plants.
  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at and
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants.
  • Kew Science Photographs

    • Copyright applied to individual images
  • Plants and People Africa

    • Common Names from Plants and People Africa
    • © Plants and People Africa
  • Useful Plants and Fungi of Colombia

  • Useful Plants of Boyacá Project

    • ColPlantA database