Lycopus L.

First published in Sp. Pl.: 21 (1753)
This genus is accepted
The native range of this genus is Temp. Northern Hemisphere to NW. Africa, E. & SE. Australia.

Descriptions

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.

Morphology General Habit
Perennial herbs, with horizontal rhizomes or runners, sometimes tuberiferous, weakly or not aromatic, with simple hairs
Morphology Leaves
Leaves opposite, petiolate or sessile, ovate to lanceolate or linear, variously toothed or pinnatifid
Morphology Reproductive morphology Inflorescences
Inflorescence of tight, axillary verticillasters
Morphology Reproductive morphology Flowers
Flowers sessile to subsessile
Morphology Reproductive morphology Flowers Calyx
Calyx actinomorphic to weakly zygomorphic, not accrescent, tubular-campanulate to campanulate, 4-5-nerved, 4-5-lobed, lobes ± equal, ovate to lanceolate-subulate or aristate, throat glabrous
Morphology Reproductive morphology Flowers Corolla
Corolla white, usually weakly zygomorphic, occasionally ± actinomorphic or 2-lipped, lobes usually 4, posterior and sometimes anterior lobe larger than lateral ones, all entire or posterior lobe bifid, tube straight
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 2 (posterior pair reduced to staminodes or absent), exserted or included, filaments glabrous, thecae parallel to divergent, separate at dehiscence
Morphology Reproductive morphology Flowers Gynoecium Style
Style often expanded near base to form flange covering top of ovary
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma-lobes equal or unequal
Morphology Reproductive morphology Flowers Disc
Disc symmetrical
Morphology Reproductive morphology Fruits
Nutlets obovoid-tetrahedral, often with conspicuously toothed to tuberculate apical crest, glabrous, inner and upper faces often densely glandular.
Note
2n = 22.  About fourteen species
Ecology
Wet habitats
Distribution
Mostly in the north-temperate zone (one species in Australia e introduced to New Zealand).
[LKGF]

Sources

  • Herbarium Catalogue Specimens

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. 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