Asteraceae

Parthenium L.

First published in Sp. Pl.: 988 (1753)
This genus is accepted
The native range of this genus is New World.

Descriptions

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

Morphology General Habit
Herbs or shrubs
Morphology Leaves
Leaves alternate
Morphology Reproductive morphology Inflorescences Capitulum
Capitula in terminal panicles, radiate, heterogamous; involucre with phyllaries in 2–3 series; receptacle paleate
Morphology Reproductive morphology Flowers Florets
Female florets with minute rays; disc florets infundibuliform; anthers with apical appendage, obtuse at base; style of ray florets bifid, of disc florets entire and obtuse
sex Female
Female florets with minute rays; disc florets infundibuliform; anthers with apical appendage, obtuse at base; style of ray florets bifid, of disc florets entire and obtuse
Morphology Reproductive morphology Fruits
Achenes of ray florets compressed, keeled, enveloped by phyllary and two paleae; pappus of 2 recurved awns enclosed in the paleae.
[FTEA]

George R. Proctor (2012). Flora of the Cayman Isands (Second Edition). Royal Botanic Gardens, Kew

Morphology General Habit
Herbs or shrubs; leaves alternate, entire to pinnately cut
Morphology Reproductive morphology Flowers
Heads radiate, small, in terminal panicles; involucre bell-shaped, of few broad phyllaries in 2 or 3 series; receptacle more or less raised, bearing scales surrounding the disc-florets
Ray
Ray-florets few, pistillate, their ligules short, broad, 2-toothed and persistent
Disc
Disc-florets perfect but only staminate in function, funnel-shaped and 5-toothed; anthers entire at the base; styles unbranched
Morphology Reproductive morphology Fruits
Achenes compressed, keeled on the inner face each surrounded by a phyllary and 2 concave receptacular scales, crowned by the persistent ligule and a pappus of 2–3 recurved awns.
Distribution
A chiefly Mexican genus of 15 species.
[Cayman]

Sources

  • Flora of Tropical East Africa

    • Flora of Tropical East Africa
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Flora of the Cayman Islands

    • Flora of the Cayman Islands
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0

  • World Checklist of Vascular plants (WCVP)

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0