Zannichellia
| Zannichellia | |
|---|---|
| |
| Zannichellia palustris | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Order: | Alismatales |
| Family: | Potamogetonaceae |
| Genus: | Zannichellia L. |
| Synonyms[1] | |
| |
Zannichellia (common name horned pondweed)[2] is a genus of submerged aquatic flowering plant,[3] with threadlike leaves and tiny flowers.[3] It is fully adapted to an aquatic life cycle, including underwater pollination.[2]
There are perhaps five species, including Zannichellia palustris.[4]
The genus is named after Gian Girolamo Zannichelli (1662–1729), Italian botanist.
Description[edit]
These slender plants grow submerged in water. The leaves are usually oppositely arranged and long and narrow. They have stipular sheaths.[5]
The flowers are unisexual. The male flowers have a single stamen with a slender filament and anthers that are 2-4-thecous.[5]
The female flowers have a cup-shaped membranous perianth. There are usually four carpels with a single pendulous ovule in each ovary. The stigma is shield shaped with toothed margins.[5]
The fruit is usually made of four long, dry achenes. The seeds are pendulous with a sub-cylindric embryo. The cotyledonous end is folded on itself twice.[5]
Distribution[edit]
The species of this genus are widely distributed and are found growing in temperate and tropical regions around the world.[5][1] They grow in brackish and salt water.[5]
Selected species[edit]
The following species are accepted:[1]
- Zannichellia andina Holm-Niels. & R.R.Haynes
- Zannichellia aschersoniana Graebn.
- Zannichellia contorta (Desf.) Cham.
- Zannichellia indica Rottler ex Royle, 1840
- Zannichellia obtusifolia Talavera, García-Mur. & H.Smit
- Zannichellia palustris L.
- Zannichellia pedicellata Buch.-Ham. ex Wall.
- Zannichellia peltata Bertol.
- Zannichellia tuberosa Lour.
References[edit]
- Guiry, M.D.; Guiry, G.M. (2008). "Zannichellia". AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. Retrieved 2009-02-21.
- ^ a b c "Zannichellia". Global Biodiversity Information Facility. Retrieved 2022-11-06.
- ^ a b Robertson Arber, Agnes (2008). Water Plants; A Study of Aquatic Angiosperms. Read Books. ISBN 978-1-4086-5146-9.
- ^ a b Tiner, Ralph W. W. (1993). Field guide to coastal wetland plants of the southeastern United States. Abigail Rorer (Illustrator). University of Massachusetts Press. ISBN 978-0-87023-833-8.
- ^ "Zannichellia in Flora of North America @ efloras.org". www.efloras.org. Retrieved 2017-02-01.
- ^ a b c d e f Phillips, Edwin Percy (1951). The genera of South African flowering plants. South Africa: Government Printer.
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