''Trichostema'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...

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, savo ...

, which are

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

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 ...

s. These plants are native to North America.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 ''Trichostema arizonicum'', the Arizona bluecurls, is a perennial plant in the mint family (Lamiaceae) native to the Southwestern United States ( Arizona, New Mexico, Texas) and northwestern Mexico.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 Rang ...

'' H.F.Lewis – Nevada, California, Baja California *''

Trichostema brachiatum ''Trichostema brachiatum'', commonly known as fluxweed or false pennyroyal, is a species of plant endemic to North America. Conservation Status In the United States, ''Trichostema brachiatum'' is listed as endangered in Connecticut, Massachuse ...

'' L. - central and eastern North America *'' Trichostema dichotomum'' L. – Bahamas, Quebec, Ontario, eastern and south-central United States *''

Trichostema lanatum ''Trichostema lanatum'', the woolly bluecurls, is a small evergreen shrub or sub-shrub native to arid coastal chaparral regions of California and the northern parts of Baja California. ''Trichostema lanatum'' is many-branched and grows to 1.5& ...

'' Benth. – California, Baja California *'' Trichostema lanceolatum'' Benth. – Washington, Oregon, California, Baja California *'' Trichostema laxum'' A.Gray – Oregon, California *'' Trichostema mexicanum'' Epling – northeastern Mexico *'' Trichostema micranthum'' A.Gray – Arizona, California, Baja California *''

Trichostema nesophilum ''Trichostema nesophilum'', known as dune blue curls, Bald Head blue curls, and Carolina blue curls, is a species of flowering plant endemic to coastal dune grasslands in the southeastern United States. It was first formally described in 2019 ...

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

References

Lamiaceae genera Flora of Northern America {{Lamiaceae-stub