Skip to main content
This genus is accepted, and its native range is S. Canada to Mexico.
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
Shrubs, subshrubs, and annuals, strongly aromatic
Morphology Leaves
Leaves opposite, petiolate or sessile, elliptic to linear or ovate, usually entire
Morphology Reproductive morphology Inflorescences
Inflorescence of axillary cymes, sometimes reduced to solitary flowers or grading into paniculiform terminal thyrse
Morphology Reproductive morphology Flowers Calyx
Calyx actinomorphic or zygomorphic, accrescent, 5-lobed (3/2), posterior lobes in zygomorphic calyces forming long upper lip (appearing to be lower lip in fruit due to post-anthesis resupination), anterior lobes shorter
Morphology Reproductive morphology Flowers Corolla
Corolla violet to pink, zygomorphic, 5-lobed, four posterior lobes usually similar, entire, anterior-most lobe larger, entire or erose, tube straight or distally upturned, corolla in bud strongly asymmetrical to nearly symmetrical
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 4, usually didynamous, usually long-exserted, filaments strongly arched to nearly straight, thecae divergent to nearly parallel, confluent at dehiscence
Morphology Reproductive morphology Flowers Pollen
Pollen with supratectal spines or spinules, columellate stratum of exine undifferentiated or composed of branched columellae
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary shallowly 4-lobed
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma-lobes equal or unequal
Morphology Reproductive morphology Flowers Disc
Disc well developed to absent
Morphology Reproductive morphology Fruits
Nutlets obovoid, reticulately ridged, pubescent or glabrous, attachment scar lateral, 0.2-0.5x as long as nutlet
Morphology Reproductive morphology Seeds Endosperm
Endosperm scanty or absent.
Note
2n =14, 20, 28, 38.  Seventeen species.  Five sections are recognized: Calyx strongly zygomorphic, inverted in fruit: sect. Trichostema. Annual herbs; calyx actinomorphic: sect. Orthopodium Benth. Inflorescence densely lanate; leaves linear, revolute: sec
Ecology
Dry habitats
Distribution
Ranging from southern Canada to Mexico, Florida, and the Bahamas

Native to:

Alabama, Arizona, Arkansas, British Columbia, California, Connecticut, Delaware, District of Columbia, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Mexico Central, Mexico Northeast, Mexico Northwest, Mexico Southwest, Michigan, Minnesota, Mississippi, Missouri, Nebraska, New Hampshire, New Jersey, New Mexico, New York, North Carolina, Ohio, Oklahoma, Ontario, Oregon, Pennsylvania, Québec, Rhode I., South Carolina, South Dakota, Tennessee, Texas, Vermont, Virginia, Washington, West Virginia

Trichostema L. appears in other Kew resources:

First published in Sp. Pl.: 598 (1753)

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

  • Eplingia L.O.Williams, Fieldiana, Bot. 36(3): 18 (1973).
  • 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
  • L., Gen. Pl. ed. 5: 260 (1754)
  • Lewis & Rzedowski, Madroño 25: 151-154 (1978).
  • Lewis, Brittonia 5: 276-303 (1945)
  • Trichostema L., Sp. Pl. 2: 598 (1753)

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