1. Family: Lamiaceae Martinov
    1. Isodon (Schrad. ex Benth.) Spach

      1. This genus is accepted, and its native range is Tropical & Subtropical Old World.

    [LKGF]

    Harley, R.M. et al. (2004). Labiatae, in The Families and Genera of Vascular Plants (K. Kubitzki, ed. in chief) VI: 167-275. Springer-Verlag, Berlin, Heidelberg, New York.

    Habit
    Shrubs or herbs
    Leaves
    Leaves simple, opposite, rarely ternate
    Inflorescences
    Inflorescence thyrsoid with cymes pedunculate, bracteate, bracteolate, 3- to several-flowered
    Bracts
    Bracts persistent, not coloured, smaller than leaves
    Bracteoles
    Bracteoles small, usually linear
    Calyx
    Calyx campanulate, funnel-shaped, or tubular and sometimes slightly constricted or rarely curved at throat, actinomorphic or 2-lipped, 5-lobed (3/2 or regular), lobes lanceolate to deltoid, posterior never decurrent, throat open, glabrous
    Corolla
    Corolla strongly 2-lipped, 5-lobed (4/1), white, blue, pink or purplish, posterior lip ascending or reflexed, 4-lobed with lobes equal or rarely median more shallowly lobed, anterior lip horizontal, cucullate, corolla-tube straight or geniculate, saccate
    Stamens
    Stamens 4, held within, or more rarely exceeding the anterior lip, posterior pair attached near base of corolla or between base and midpoint, usually with hairs, anterior pair attached between midpoint of corolla and throat, often with hairs
    Stigma
    Stigma-lobes diverging
    Disc
    Disc 4-lobed with anterior lobe slightly larger, lobes alternating with nutlets
    Fruits
    Nutlets ovoid, rarely conical with a flattened base, glabrous, sometimes with hairs or glands, mucilaginous or not, areole small, inconspicuous.
    Note
    2n = 24, 42.  Around 100 species
    Distribution
    Tropical Asia with two species in Africa.
    [FTEA]

    Lamiaceae (Labiatae), A.J. Paton, G. Bramley, O. Ryding, R.M. Polhill, Y.B. Harvey, M. Iwarsson, F. Willis, P.B. Phillipson, K. Balkwill, C.W. Lukhoba, D.F. Otieno, & R.M. Harley. Isodon, RM Polhill. Flora of Tropical East Africa. 2009

    Habit
    Herbs or shrubs
    Stem
    Stems quadrangular, with simple sometimes septate hairs, glandular hairs and sessile glands
    Leaves
    Leaves undivided, opposite, rarely ternate, usually petiolate
    Inflorescences
    Inflorescences thyrsoid, extended with cymes pedunculate, dichasial lax, elsewhere sometimes more congested; bracts leaf-like, smaller above; bracteoles present
    Calyx
    Calyx campanulate to tubular, accrescent, sometimes becoming slightly constricted and curved at throat, subequally 5-toothed, sometimes slightly 2-lipped, the posterior lip with 3 teeth, the anterior with 2 teeth
    Corolla
    Corolla white, blue, pink or purplish, 2-lipped; tube straight or geniculate, ± saccate to spurred at base, ± parallelsided distally; posterior lip short, recurved or reflexed, 4-lobed; anterior lip flat to boat-shaped, ± horizontal
    Stamens
    Stamens 4, declinate, posterior pair attached near base of corolla, anterior pair attached in upper part of corolla tube
    Disc
    Disk 4-lobed, with anterior lobe slightly larger
    Ovary
    Ovary deeply 4-lobed; style gynobasic, exserted, bifid with lobes short, equal and diverging
    Fruits
    Nutlets ovoid to ellipsoid or rarely conical, glabrous, mucilaginous when wetted or not; attachment scar basal, small.

    Images

    Distribution

    Native to:

    Afghanistan, Amur, Angola, Assam, Bangladesh, Borneo, Burundi, Cameroon, China North-Central, China South-Central, China Southeast, East Himalaya, Ethiopia, Gulf of Guinea Is., India, Japan, Jawa, Kenya, Khabarovsk, Korea, Laos, Lesser Sunda Is., Malawi, Manchuria, Myanmar, Nepal, Nigeria, Oman, Pakistan, Philippines, Primorye, Rwanda, Saudi Arabia, Sierra Leone, Sri Lanka, Sudan, Sulawesi, Sumatera, Taiwan, Tanzania, Thailand, Tibet, Uganda, Vietnam, West Himalaya, Zambia, Zaïre, Zimbabwe

    Isodon (Schrad. ex Benth.) Spach appears in other Kew resources:

    First published in Hist. Nat. Vég. 9: 162 (1838)

    Accepted by

    • Govaerts, R. (2003). World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew.

    Literature

    Flora of Tropical East Africa
    • Kubitzki, Fam. Gen. Vasc. Pl. 7: 256 (2004)
    • K.B. 58: 487 (2003)
    • K.B. 53: 723–731 (1998)
    • Pl. Syst. Evol. 185: 91–97 (1993)
    • J. Arn. Arbor. 69: 289–400 (1988)
    • Bothalia 15: 7–9 (1984)
    • Taxon 17: 239 (1968)
    • Hist. Nat. Vég. Phan. 9: 162 (1840)
    Lamiaceae Key Genus Fact Sheets
    • Harley RM, Atkins S, Budantsev AL, Cantino PD, Conn BJ, Grayer R, Harley MM, de Kok RPJ, Krestovskaja T, Morales R, Paton AJ, Ryding O, and Upson T. 2004. Labiatae, in The Families and Genera of Vascular Plants (K. Kubitzki, ed. in chief) VI: 167-275. Sp
    • Paton & Ryding, Kew Bull. 53: 723-731 (1998).
    • Li, J. Arnold Arbor. 69: 289-400 (1988), rev.
    • Rabdosiella Codd, Bothalia 15: 9 (1984).
    • Skapanthus C.Y.Wu & H.W.Li, Acta Phytotax. Sin. 13: 77 (1975).
    • Homalocheilos J.K.Morton, J. Linn. Soc., Bot. 58: 249 (1962).
    • Amethystanthus Nakai, Bot. Mag. (Tokyo) 48: 785 (1934).
    • Dielsia Kudô, Mem. Fac. Sci. Taihoku Imp. Univ. 2: 143 (1929), nom. illeg.
    • Isodon (Benth.) Schrader ex Spach, Hist. Nat. Vég. 9: 162 (1840)
    • Plectranthus L'Hér. sect. Amethystoides Schrad. ex Benth. (1832).
    • Plectranthus L'Hér. sect. Isodon Schrad. ex Benth. (1832).
    • Plectranthus L'Hér. sect. Melissoides Schrad. ex Benth. (1832).
    • Plectranthus L'Hér. sect. Pyramidatum Schrad. ex Benth. (1832).

    Sources

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

    Lamiaceae Key Genus Fact Sheets
    Nina Davies, Gemma Bramley and Don Kirkup, Royal Botanic Gardens, Kew
    http://creativecommons.org/licenses/by/3.0