1. Family: Fabaceae Lindl.
    1. Indigofera L.

      1. This genus is accepted, and its native range is Africa, Asia to SW. Pacific, Central & S. U.S.A. to Tropical & Subtropical America.

    [FTEA]

    Leguminosae, J. B. Gillett, R. M. Polhill & B. Verdcourt. Flora of Tropical East Africa. 1971

    Habit
    Annual or perennial herbs or small shrubs
    Indumentum
    Hairs typically biramous, sometimes subsimple or simple through the suppression of one arm; stiff erect multicellular, often gland-tipped, hairs sometimes also occur
    Leaves
    Leaves pulvinate, usually imparipinnate, sometimes 3-foliolate, conjugate, 1-foliolate or simple, very rarely paripinnate with the rhachis ending in a point; stipules not adnate to petiole nor encircling the stem; stipellae present or absent; leaflets entire, their lateral nerves obscure
    Flowers
    Flowers usually in axillary racemes, less often in open or subcapitate panicles, single in the leaf-axils or in dense axillary clusters
    Corolla
    Corolla usually red or pink, caducous or rarely the standard persistent, at the most (in Flora area) ± 18 mm. long, usually much less; standard longer than wide, narrowed gradually to the base; claw of wing, if distinct from blade, less than one-eighth as long as blade; keel with a ± gently curved lower margin, rather gibbous or, more usually, spurred at each side; claw of keel short, widening gradually, often hardly distinct from blade
    Stamens
    Upper (vexillary) filament free, the others united, persistent; anthers ± uniform, dorsifixed, almost always apiculate, with or, more usually, without basal scales
    Fruits
    Pod usually dehiscent, 1-seeded by abortion, or, more often, 2–many-seeded, cylindrical, tetragonal or flattened, never inflated, rarely as much as 3 mm. across; endocarp often spotted, forming septa between the seeds.
    [LOWO]

    Legumes of the World. Edited by G. Lewis, B. Schrire, B. MacKinder & M. Lock. Royal Botanic Gardens, Kew. (2005)

    Habit
    Herbs, shrubs or small trees
    Ecology
    Seasonally dry tropical to warm temperate forest, woodland, wooded grassland and grassland, sclerophyllous shrubland, forest margins and disturbed areas
    Distribution
    Africa-Madagascar (c. 490 spp.); Asia to Pacific (c. 115 spp.); Australasia (c. 30-40 spp.); c. 13 spp. widespread in the Palaeotropics; c. 6 spp. pantropical; New World c. 45 spp. USA to Argentina (c. 30 spp. in N & C America, c. 15 spp. in S America)
    Note
    A genus of c. 25 sections in Africa-Madagascar where Indigofera is most diverse, increasing to c. 30 sections worldwide; all species belong to one of four well-supported and biogeographically distinctive clades in the analyses of Schrire et al. (2003)

    Polhill (1981f) recognised 4 genera and c. 710 species in Indigofereae. This treatment following Polhill (1994), Schrire (1995), Barker et al. (2000) and Schrire et al. (2003) recognises 7 genera and c. 768 species in the tribe (Fig. 44). The Indigofereae are predominantly African-Madagascan in distribution, occurring in seasonally dry vegetation types of the tropics and subtropics. The genus Indigofera (third largest in the Leguminosae) is pantropical in distribution.

    Recent morphological-molecular analyses (Pennington et al., 2000a; Crisp et al., 2000; Wojciechowski et al., 2000, 2004; Hu, 2000; Kajita et al., 2001; Hu et al., 2002 and Wojciechowski, 2003) place Indigofereae at the base of a combined millettioid group of tribes (including Millettieae, Abreae, Phaseoleae, Desmodieae and Psoraleeae). This entire clade is sister to Hologalegina (comprising the robinioids and the Inverted Repeat Lacking Clade (IRLC)). Basally branching to these two clades are the South African Hypocalypteae and Australian tribes Mirbelieae and Bossiaeeae.

    The Indigofereae (Barker et al., 2000; Schrire et al., 2003) comprises a Cyamopsis, Indigastrum, Microcharis and Rhynchotropis (CRIM) clade which is sister to the Indigofera-Vaughania clade. The Madagascan Phylloxylon is putatively the most basally branching genus in the tribe, although in some analyses in Schrire et al. (2003), Phylloxylon is sister to the CRIM clade.

    [LOWO]

    Legumes of the World. Edited by G. Lewis, B. Schrire, B. MacKinder & M. Lock. Royal Botanic Gardens, Kew. (2005)

    Habit
    Trees and shrubs
    Ecology
    Seasonally dry tropical forest, woodland, xerophytic bushland and grassland, on sand or rocky (often limestone) outcrops and riverine
    Distribution
    Madagascar (S, SW, W and C)
    Note
    Recent molecular evidence (Barker et al., 2000; Schrire et al., 2003) places Vaughania, together with the anomalous Réunion Island endemic Indigofera ammoxylum (DC.) Polhill (= Bremontiera ammoxylum DC.), as elements within Indigofera; both are considered to be highly modified, Indian Ocean Island, neo-endemic lineages of Indigofera, but formalising the transfer of Vaughania into synonymy awaits further study
    [LOWO]
    Use
    Used as dyes (important species are I. arrecta Hochst. ex A. Rich., I. articulata Gouan, I. suffruticosa Mill. and I. tinctoria L.), medicine, fodder, cover crops, green manure, human food, erosion control and ornamentals; some species are toxic to livestock, others have insecticidal qualities
    [LOWO]
    Use
    The extremely hard wood is used for fuel, poles, implements and construction; other uses are fodder for livestock

    Images

    Distribution

    Native to:

    Afghanistan, Alabama, Aldabra, Algeria, Andaman Is., Angola, Argentina Northeast, Argentina Northwest, Arizona, Aruba, Assam, Bahamas, Bangladesh, Belize, Benin, Bismarck Archipelago, Bolivia, Borneo, Botswana, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, Burkina, Burundi, Cambodia, Cameroon, Cape Provinces, Cape Verde, Caprivi Strip, Cayman Is., Central African Repu, Chad, Chile North, China North-Central, China South-Central, China Southeast, Christmas I., Cocos (Keeling) Is., Colombia, Comoros, Congo, Costa Rica, Cuba, Djibouti, Dominican Republic, East Himalaya, Ecuador, Egypt, El Salvador, Equatorial Guinea, Eritrea, Ethiopia, Florida, Free State, French Guiana, Gabon, Gambia, Georgia, Ghana, Guatemala, Guinea, Guinea-Bissau, Gulf of Guinea Is., Gulf States, Guyana, Hainan, Haiti, Honduras, India, Inner Mongolia, Iran, Ivory Coast, Jamaica, Japan, Jawa, Kansas, Kenya, Korea, KwaZulu-Natal, Laccadive Is., Laos, Leeward Is., Lesotho, Lesser Sunda Is., Liberia, Libya, Louisiana, Madagascar, Malawi, Malaya, Maldives, Mali, Maluku, Manchuria, Mauritania, Mauritius, Mexico Central, Mexico Gulf, Mexico Northeast, Mexico Northwest, Mexico Southeast, Mexico Southwest, Mississippi, Mozambique, Myanmar, Namibia, Nansei-shoto, Nepal, Netherlands Antilles, New Guinea, New Mexico, New South Wales, Nicaragua, Nicobar Is., Niger, Nigeria, North Carolina, Northern Provinces, Northern Territory, Oklahoma, Oman, Pakistan, Palestine, Panamá, Paraguay, Peru, Philippines, Puerto Rico, Qinghai, Queensland, Rwanda, Réunion, Saudi Arabia, Senegal, Sierra Leone, Sinai, Socotra, Somalia, South Australia, South Carolina, South China Sea, Southwest Caribbean, Sri Lanka, Sudan, Sulawesi, Sumatera, Swaziland, Taiwan, Tanzania, Tasmania, Texas, Thailand, Tibet, Togo, Trinidad-Tobago, Turks-Caicos Is., Uganda, Uruguay, Vanuatu, Venezuela, Venezuelan Antilles, Victoria, Vietnam, West Himalaya, Western Australia, Western Sahara, Windward Is., Yemen, Zambia, Zaïre, Zimbabwe

    Introduced into:

    Bermuda, Chagos Archipelago, Cook Is., Fiji, Nauru, New Caledonia, Niue, Norfolk Is., North Caucasus, Rodrigues, Samoa, Seychelles, Society Is., Tonga, Transcaucasus

    Indigofera L. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Dec 1, 1974 Letouzey, R. [13433], Cameroon K000087040
    Nov 1, 1974 Letouzey, R. [13136], Cameroon K000087142
    61448.000
    McWhirter, J. [239], Madagascar 32227.000
    Bauer [s.n.], Australia K000217447
    Thulin, M. [5561], Somalia K000392838 isotype
    Mitchell [s.n.], Australia K000217448
    Schrire, B.D. [2581], Kenya 62732.000
    Schrire, B.D. [2565], Kenya 62852.000
    Cunningham, A. [s.n.], Australia K000217466
    Cunningham, A. [s.n.], Australia K000217321
    Backhouse, J. [s.n.], Australia K000217361
    Moore, C. [s.n.], Australia K000217363
    Lindley [s.n.], Australia K000217399
    Kuchar, P. [17682], Somalia K000392765 isotype
    Kuchar, P. [17682], Somalia K000392766 isotype
    leg. ign. [s.n.], Australia K000217364
    leg. ign. [s.n.], Australia K000217467
    leg. ign. [20], Australia K000217472
    leg. ign. [s,n,], Australia K000217465
    Patel, H. [7413], Mozambique K000613675

    First published in Sp. Pl.: 751 (1753)

    Literature

    Flora of West Tropical Africa
    • Tisserant in Bull. Mus. Hist. Nat., sér. 2, 3: 163–172, 258–272 (1931).
    • —F.T.A. 2: 65
    Flora of Tropical East Africa
    • Gillett in K.B., Add. Ser. 1 (1958)
    • L., Gen. Pl., ed. 5: 333 (1754)
    • Sp. Pl.: 751 (1753)

    Sources

    Art and Illustrations in Digifolia
    Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/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 2019. 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 2019. 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

    Legumes of the World Online
    http://creativecommons.org/licenses/by-nc-sa/3.0