''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 nom ...

of flowering plants in the family Lamiaceae, 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 subshrubs. 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'' 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 lanatum'' 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'' – 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