Asteraceae

Synedrella Gaertn.

First published in Fruct. Sem. Pl. 2: 456 (1791), nom. cons.
This genus is accepted
The native range of this genus is Mexico to Tropical America.

Descriptions

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

Morphology General Habit
Annual herbs; leaves usually opposite, serrate or subentire
Morphology Reproductive morphology Flowers
Heads sessile, radiate; involucre oblong, of few bracts, the outer leaf-like; receptacle small, bearing flat chaffy scales among the florets
Ray
Ray-florets pistillate, fertile, each with a short, broad ligule
Disc
Disc- florets perfect and fertile, tubular and 4-toothed; anthers minutely sagittulate; style-arms with hairy appendages
Morphology Reproductive morphology Fruits
Achenes compressed, dimorphic, those of the ray-florets crested- winged, those of the disc-florets with narrow entire wings and 2 awns.
Distribution
A tropical American genus of 2 species, one of wide distribution, the other a native of Ecuador.
[Cayman]

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

Morphology General Habit
Annual herbs, erect or procumbent
Morphology Leaves
Leaves opposite, simple, 3-veined from base
Morphology Reproductive morphology Inflorescences Capitulum
Capitula axillary or terminal, small, usually in glomerules but sometimes solitary, heterogamous; involucre with few phyllaries, the outer foliaceous, the inner resembling the paleae and enveloping the marginal achenes; receptacular paleae subtending the internal florets
Morphology Reproductive morphology Flowers Florets
Ray florets 3–8, fertile; disc florets 5–10, hermaphrodite, fertile, with 4 corolla lobes and 4 stamens, the anthers sagittate and with obtuse or truncate apical appendage
Morphology Reproductive morphology Fruits
Achenes of marginal florets ellipsoid, compressed, with winged margins; pappus of 2–3 short awns Achenes of inner florets compressed, wings present or absent, tuberculate on one surface; pappus of 2(–4) awns.
[FTEA]

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

  • Herbarium Catalogue Specimens

  • 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