1. Family: Lythraceae J.St.-Hil.
    1. Rotala L.

      1. This genus is accepted, and is native to Asia-Tropical, Africa, Southern America, Northern America, Australasia and Asia-Temperate..

    [FZ]

    Lythraceae, A. Fernandes. Flora Zambesiaca 4. 1978

    Habit
    Annual or rarely perennial glabrous herbs, aquatic or in marshy places.
    Stem
    Stems terete or 4-gonous, striate, often rooting at the nodes.
    Leaves
    Leaves decussate or verticillate, rarely alternate, sessile or subsessile.
    Flowers
    Flowers small, actinomorphic, homostylous or heterostylous, 3–6-merous, axillary, solitary, or in terminal racemes or spikes, very rarely in axillary umbels; bracteoles 2, rarely absent.
    Calyx
    Calyx-tube semiglobose, campanulate or urceolate-tubular, scarious, very rarely herbaceous, the lobes triangular, alternating with ± developed appendages or these often absent; nectariferous ring present at base.
    Corolla
    Petals persistent, sometimes caducous or absent, equal or unequal.
    Stamens
    Stamens 1-6, opposite to the sepals.
    Pistil
    Ovary sessile or substipitate, incompletely 2–4-locular (dissepiments interrupted above the placentas); ovules ± numerous, small; style absent or ± developed, simple.
    Fruits
    Capsule septicidally 2–4-valved, cartilaginous, the walls horizontally striate (under the microscope).
    Seeds
    Seeds small, concave-convex.
    [FTEA]

    Lythraceae, B. Verdcourt. Flora of Tropical East Africa. 1984

    Habit
    Aquatic, amphibious or terrestrial annual or perennial glabrous herbs with creeping to erect or floating stems
    Leaves
    Leaves opposite, whorled or rarely alternate, simple, entire, sessile or rarely shortly petiolate; stipules absent
    Flowers
    Flowers regular, hermaphrodite, solitary in leaf-axils (bracts) along the main axis or in lateral or terminal racemes, sometimes heterostylous, occasionally cleistogamous; bracteoles 2 (rarely more in one non-African species) or absent
    Calyx
    Calyx tubular, often enclosing the ovary; lobes 3–6, valvate, persistent; appendages or folds sometimes present between the lobes
    Corolla
    Petals up to 6, minute to large and showy or sometimes absent, inserted at top of calyx-tube, usually crumpled in bud, entire, erose or pinnately divided in one species
    Stamens
    Stamens 1–6, inserted in lower half of calyx-tube, sometimes basal and appearing free, occasionally replaced by staminodes
    Pistil
    Ovary superior, 2–4-locular; placentation axile, becoming free-central at maturity; style simple, persistent on one fruit valve; stigma capitate (bilobed in one Indian species)
    Fruits
    Capsule septicidally dehiscent by 2–4 valves; valves with microscopic horizontal striations
    Seeds
    Seeds few–numerous, ± ellipsoidal, with mucilaginous hairs.

    Images

    Distribution

    Doubtfully present in:

    Guyana

    Native to:

    Alabama, Andaman Is., Angola, Argentina Northeast, Assam, Bangladesh, Belize, Benin, Bolivia, Borneo, Botswana, Brazil North, Brazil Southeast, Brazil West-Central, British Columbia, Burkina, Burundi, Cameroon, Caprivi Strip, Central African Repu, Chad, China South-Central, China Southeast, Colombia, Colorado, Congo, Connecticut, Costa Rica, Cuba, Dominican Republic, Ecuador, El Salvador, Eritrea, Ethiopia, Free State, French Guiana, Gabon, Guatemala, Guinea, Guinea-Bissau, Hainan, Haiti, Honduras, Illinois, India, Ivory Coast, Jamaica, Japan, Jawa, Kentucky, Kenya, Korea, KwaZulu-Natal, Laos, Leeward Is., Lesotho, Madagascar, Malawi, Malaya, Mali, Mauritania, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Mozambique, Myanmar, Namibia, Nepal, Netherlands Antilles, New Guinea, New Jersey, New York, Nicaragua, Niger, Nigeria, Northern Provinces, Northern Territory, Panamá, Paraguay, Peru, Puerto Rico, Queensland, Rwanda, Senegal, Sierra Leone, Sri Lanka, Sudan, Suriname, Tadzhikistan, Taiwan, Tanzania, Tennessee, Thailand, Togo, Trinidad-Tobago, Uganda, Venezuela, Venezuelan Antilles, Vietnam, Virginia, Western Australia, Windward Is., Zambia, Zaïre, Zimbabwe

    Introduced into:

    Greece, Italy, Philippines, Portugal

    Rotala L. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Okafor [36868], Nigeria 32816.000
    Gomez, W. [Cat. no. 9059], Myanmar K001132153
    Gomez, W. [Cat. no. 9059], Myanmar K001132154

    First published in Mant. Pl. 2: 143 (1771)

    Literature

    Flora of West Tropical Africa
    • Koehne in Engl. Pflanzenr. Lythrac. 24 (1903).
    • —F.T.A. 2: 466
    Flora Zambesiaca
    • Mant. Pl. Alt.: 175 (1771).
    Flora of Tropical East Africa
    • C.D.K. Cook in Boissiera 29: 1–156 (1979)
    • Mant. Pl. Alt: 143, 175 (1771)

    Sources

    Flora Zambesiaca
    Flora Zambesiaca
    http://creativecommons.org/licenses/by-nc-sa/3.0

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

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    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 2018. 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 2018. 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