''Trichostema'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

of flowering plants in the family

Lamiaceae The Lamiaceae ( ) or Labiatae are a family of flowering plants commonly known as the mint, deadnettle or sage family. Many of the plants are aromatic in all parts and include widely used culinary herbs like basil, mint, rosemary, sage, savory ...

, which are

aromatic herb An essential oil is a concentrated hydrophobic liquid containing Volatility (chemistry), volatile (easily evaporated at normal temperatures) chemical compounds from plants. Essential oils are also known as volatile oils, ethereal oils, aetherol ...

s or

subshrub A subshrub (Latin ''suffrutex'') or dwarf shrub is a short shrub, and is a woody plant. Prostrate shrub is a related term. "Subshrub" is often used interchangeably with "bush".Jackson, Benjamin, Daydon; A Glossary of Botanic Terms with their Der ...

s. These plants are native to

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and the Car ...

.Kew World Checklist of Selected Plant Families
/ref> Many plant of this genus which have whorls of small blue flowers are called by the common name bluecurls.

Species

Species include: *'' Trichostema arizonicum'' A.Gray – Arizona, New Mexico, Texas, Sonora, Chihuahua *''

Trichostema austromontanum ''Trichostema austromontanum'' is a species of flowering plant in the mint family known by the common name San Jacinto bluecurls. It is native to California from the mountains east of the Sierra Nevada to the Transverse Ranges and Peninsular Ra ...

'' H.F.Lewis – Nevada, California, Baja California *'' Trichostema brachiatum'' L. - central and eastern North America *''

Trichostema dichotomum ''Trichostema dichotomum'', commonly known as forked bluecurls, is a flowering plant in the mint family (Lamiaceae). The plant is found in the Midwestern and Eastern United States, Eastern Canada, and the Bahamas. Description ''Trichostema dic ...

'' L. – Bahamas, Quebec, Ontario, eastern and south-central United States *'' Trichostema lanatum'' Benth. – California, Baja California *'' Trichostema lanceolatum'' Benth. – Washington, Oregon, California, Baja California *'' Trichostema laxum'' A.Gray – Oregon, California *''

Trichostema mexicanum ''Trichostema'' is a genus of flowering plants in the family Lamiaceae, which are aromatic herbs or subshrubs. These plants are native to North America. Many plant of this genus which have whorls of small blue flowers are called by the common nam ...

'' Epling – northeastern Mexico *'' Trichostema micranthum'' A.Gray – Arizona, California, Baja California *'' Trichostema nesophilum'' – North Carolina, South Carolina *'' Trichostema oblongum'' Benth. – British Columbia, Washington, Oregon, California, Nevada, Idaho *'' Trichostema ovatum'' Curran – California *'' Trichostema parishii'' Vasey – California, Baja California *'' Trichostema purpusii'' Brandegee – central and southern Mexico *'' Trichostema rubisepalum'' Elmer – central California *'' Trichostema ruygtii'' H.Lewis – northern California (Lake, Napa, Solano Counties) *'' Trichostema setaceum'' Houtt. – eastern and south-central United States *''

Trichostema simulatum ''Trichostema simulatum'' is a species of flowering plant in the Lamiaceae, mint family known by the common name Siskiyou bluecurls. It is found n the western United States, where it is native to the southern Cascade Range in northern California ...

'' Jeps. – Oregon, California *'' Trichostema suffrutescens'' Kearney – Florida

References

Lamiaceae genera Flora of Northern America {{Lamiaceae-stub