''Trichostema'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of flowering plants in the family

Lamiaceae The Lamiaceae ( ) or Labiatae are a family (biology), 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 (herb), ba ...

, 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 undershrub is either a small shrub (e.g. prostrate shrubs) or a perennial that is largely herbaceous but slightly woody at the base (e.g. garden pink and florist's chrysanthemum). The term is often interch ...

s. These plants are native to

North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...

.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'' 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 fruticosum'' K.S.McClell. - Mississippi, Alabama, Florida, Georgia *''

Trichostema lanatum ''Trichostema lanatum'', also known as woolly bluecurls, is a small evergreen shrub or sub-shrub native to arid coastal chaparral regions of California down to the northern tip of Baja California, Mexico. Description ''Trichostema lanatum'' is ...

'' Benth. – California, Baja California *''

Trichostema lanceolatum ''Trichostema lanceolatum'', with the common names vinegarweed and camphor weed, is an annual flowering herb of the mint family native to western North America. The common name 'vinegarweed' originated due to its foliage containing volatile oil ...

'' 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 ''Trichostema micranthum'' is a species of flowering plant in the mint family, known by the common name smallflower bluecurls. Distribution The plant is native to Southern California, northwestern Arizona, and northern Baja California state. In ...

'' 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 ''Trichostema rubisepalum'' is a species of flowering plant in the mint family known by the common name Hernandez's bluecurls. Distribution The plant is endemic to California. It has a disjunct distribution occurring in two main locations: the s ...

'' Elmer – central California *'' Trichostema ruygtii'' H.Lewis – northern California (Lake, Napa, Solano Counties) *'' Trichostema setaceum'' Houtt. – eastern and south-central United States *'' Trichostema simulatum'' Jeps. – Oregon, California *'' Trichostema suffrutescens'' Kearney – Florida

References

Lamiaceae genera Flora of Northern America {{Lamiaceae-stub