- Family:
- Hydrocharitaceae Juss.
Hydrilla Rich.

[FTEA]
Hydrocharitaceae, David Simpson. Flora of Tropical East Africa. 1989
- Morphology General Habit
- Monoecious, rarely dioecious, submerged, freshwater, annual or perennial herbs
- Vegetative Multiplication Bulbils
- Plants often perennating by turions, the turions bulbil-like, arising from tip of stolons or in leaf-axils
- Morphology Roots
- Roots simple, adventitious, without root-hairs, arising from nodes
- Morphology Stem
- Stems elongate, stoloniferous, or erect, terete, simple or branched from axils; branches 1 per axil
- Morphology Leaves
- Leaves sessile, opposite towards base of stem or branch, otherwise in whorls of 3–8(–12), linear to ovate, shortly acuminate to obtuse, patent, spreading or strongly recurved, flaccid, light to dark green, opaque or somewhat translucent, with 1 apical spine; margins hyaline, denticulate, the teeth usually patent; venation consisting of midrib only Nodal scales 2 per leaf, narrowly triangular to narrowly lanceolate, fringed with orange-brown hairs
- Morphology Leaves Stipules
- Stipules 0
- Morphology Reproductive morphology Flowers
- Flowers unisexual Female flower: sepals 3, free, oblong to ovate, somewhat cucullate, erect; petals 3, free, oblong to ovate, obtuse, erect; staminodes 3, minute, linear or absent; ovary of 3 carpels, 1-locular, placentation parietal; ovules up to 5, anatropous; perianth-tube filiform, carrying perianth to the water surface; styles 3; stigmas 3, linear, usually entire, rarely bifid, papillose Male flowers shortly pedicellate, becoming detached and floating before anthesis; sepals 3, ovate, obtuse, reflexed at anthesis; petals 3, linear to ± spathulate, obtuse, ± reflexed at anthesis; stamens 3, anthers erect, 4-thecous, dehiscing explosively; filaments filiform
- Morphology Reproductive morphology Inflorescences
- Male spathe solitary in leaf-axil, sessile, appendages at the apex, 1-flowered Female spathes 1(–2) in leaf-axil, sessile, cylindric but tapering toward apex, 1-flowered
- sex Male
- Male spathe solitary in leaf-axil, sessile, appendages at the apex, 1-flowered Male flowers shortly pedicellate, becoming detached and floating before anthesis; sepals 3, ovate, obtuse, reflexed at anthesis; petals 3, linear to ± spathulate, obtuse, ± reflexed at anthesis; stamens 3, anthers erect, 4-thecous, dehiscing explosively; filaments filiform
- sex Female
- Female flower: sepals 3, free, oblong to ovate, somewhat cucullate, erect; petals 3, free, oblong to ovate, obtuse, erect; staminodes 3, minute, linear or absent; ovary of 3 carpels, 1-locular, placentation parietal; ovules up to 5, anatropous; perianth-tube filiform, carrying perianth to the water surface; styles 3; stigmas 3, linear, usually entire, rarely bifid, papillose Female spathes 1(–2) in leaf-axil, sessile, cylindric but tapering toward apex, 1-flowered
- Morphology Reproductive morphology Fruits
- Fruit cylindric, smooth or with lateral spine-like appendages
- Morphology Reproductive morphology Seeds
- Seeds up to 5, narrowly ellipsoid, smooth.
Native to:
Afghanistan, Altay, Amur, Assam, Baltic States, Bangladesh, Belarus, Borneo, Burundi, Cambodia, China North-Central, China South-Central, China Southeast, East Himalaya, Hainan, India, Iran, Irkutsk, Japan, Jawa, Kazakhstan, Kenya, Khabarovsk, Korea, Krasnoyarsk, Lesser Sunda Is., Malaya, Maluku, Manchuria, Myanmar, Nansei-shoto, Nepal, New Guinea, New South Wales, Northern Territory, Northwest European R, Pakistan, Philippines, Primorye, Queensland, Rwanda, South Australia, Sri Lanka, Sulawesi, Sumatera, Taiwan, Tanzania, Thailand, Tibet, Uganda, Victoria, Vietnam, West Himalaya, West Siberia, Western Australia, Zambia, Zaïre
Introduced into:
Alabama, Arizona, Aruba, California, Canary Is., Colombia, Connecticut, Costa Rica, Cuba, Delaware, District of Columbia, Fiji, Florida, Georgia, Germany, Ghana, Great Britain, Honduras, Indiana, Ireland, Ivory Coast, Jamaica, Kansas, Kentucky, Leeward Is., Louisiana, Madagascar, Maine, Marianas, Maryland, Massachusetts, Mauritius, Mexico Northeast, Mississippi, Missouri, Mozambique, New Caledonia, New York, New Zealand North, Nicaragua, North Carolina, Ohio, Oregon, Panamá, Pennsylvania, Réunion, South Carolina, Tennessee, Texas, Trinidad-Tobago, Venezuela, Virginia, Washington, West Virginia, Windward Is.
Hydrilla Rich. appears in other Kew resources:
Date | Reference | Identified As | Barcode | Type Status | Has image? |
---|---|---|---|---|---|
s.coll. [Cat. no. 7488] | Serpicula | K001127396 | Yes |
First published in Mém. Cl. Sci. Math. Inst. Natl. France 12(2): 9 (1811 publ. 1814)
Accepted by
- Govaerts, R.H.A. (2011). World checklist of selected plant families published update Facilitated by the Trustees of the Royal Botanic Gardens, Kew.
Literature
Flora of Tropical East Africa
- Cook & Lüönd in Aquat. Bot. 13: 485 (1982)
- Wright in F.T.A. 7: 1 (1897)
- in Mém. Cl. Sci. Math. Phys. Inst. France 1811(2): 9, 61, 69, 75 (1812, published 1814)
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Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0
-
Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/
-
Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0
-
Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2022. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0