Asteraceae

Tithonia Desf. ex Juss.

First published in Gen. Pl.: 189 (1789)
This genus is accepted
The native range of this genus is Arizona to Central America.

Descriptions

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

Morphology General Habit
Annual or perennial herbs or shrubs
Morphology Leaves
Leaves alternate or sometimes opposite near the base, 3-veined from base
Morphology Reproductive morphology Inflorescences Capitulum
Capitula solitary on long lateral peduncles which thicken near apex, heterogamous, radiate; phyllaries 2–5-seriate; paleae clasping disc florets
Morphology Reproductive morphology Flowers Florets
Ray florets sterile, 2–3-toothed; disc florets tubular, 5-lobed; anthers with sagittate base and apical appendage; style-arms hairy abaxially
Morphology Reproductive morphology Fruits
Achenes oblong; pappus a crown of free scales, usually with 1–2 awns.
[FTEA]

Sources

  • Flora of Tropical East Africa

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

  • Herbarium Catalogue Specimens

  • Kew Backbone Distributions

    • 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

  • 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

  • Kew Science Photographs

    • Copyright applied to individual images