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This genus is accepted, and its native range is N. Central & E. U.S.A.
A specimen from Kew's Herbarium

[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.

Morphology General Habit
Biennial herbs, with simple hairs
Morphology Leaves
Leaves long-petiolate, broadly cordate-ovate
Morphology Reproductive morphology Inflorescences
Inflorescence racemoid, flowers sessile
Morphology Reproductive morphology Flowers Calyx
Calyx weakly zygomorphic, 4-lobed, posterior lobe absent, lateral lobes larger than anterior pair
Morphology Reproductive morphology Flowers Corolla
Corolla 2-lipped, 4-lobed (1/3), whitish, posterior lip shallowly hooded, entire, anterior lip with erose median lobe, tube exannulate
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 4, filaments conspicuously villous with long reddish hairs, apically inward-geniculate, thecae divaricate, not confluent, ovoid, prolonged to apical apicula, outer thecae of anterior stamens fused
Morphology Reproductive morphology Flowers Disc
Disc with abaxial lobe equalling ovary
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma-lobes unequal
Morphology Reproductive morphology Fruits
Nutlets obovoid-trigonal, smooth, glabrous.
Note
2n = 18.  One species,   S. hispidula (Michx.) Baill.
Ecology
Mesic woodlands
Distribution
Eastern United States (mostly in Appalachian region).

Native to:

Alabama, Illinois, Indiana, Kentucky, North Carolina, Ohio, Tennessee, Virginia, West Virginia

Synandra Nutt. appears in other Kew resources:

First published in Gen. N. Amer. Pl. 2: 29 (1818)

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

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
  • Synandra Nutt., Gen. N. Amer. Pl. 2: 29 (1818).
  • Torreya Raf., Amer. Monthly Mag. & Crit. Rev. 1818: 356 (1818), nom. rej.

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. 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 2021. 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