Trichocereinae is a subtribe of cactus that are particular to South America. There are 28 recognized genera in this subtribe.
Description Arborescent to shrubby, Trichocereinae normally form unsegmented, spherical to columnar stems that are usually ribbed, tuberculate, or ribbed-warty.
The small to fairly large, regular or bilaterally symmetrical flowers appear laterally or below the apex and open day or night. The flower cup is scaled or covered with hair.
The fruits are fleshy to berry-like and sometimes burst open lengthwise. They contain small to medium-sized seeds that vary in shape. Hilum and micropyle of seeds are fused to united. Appendages are usually absent. A strophic is present in some.
Genera The composition of the subtribes of the tribe Cereeae varies. The list below is based on genera accepted by Plants of the World Online . Most were placed in subtribe Trichocereinae by Lendel in 2013. Reicheocactus (listed here) was not included in Lendel's analysis, and was described as basal to the subtribe. Pygmaeocereus was placed in Trichocereinae in a 2023 study. Image GenusAcanthocalycium Arthrocereus Borzicactus Chamaecereus , synonym of EchinopsisCephalocleistocactus Cleistocactus Echinopsis Espostoa Haageocereus Harrisia Lasiocereus (uncertainly in this subtribe)Leucostele Lobivia Loxanthocereus Matucana Mila Oreocereus Pygmaeocereus Rauhocereus Reicheocactus Samaipaticereus Setiechinopsis Soehrensia , synonym of EchinopsisTrichocereus Vatricania Weberbauerocereus Yungasocereus
Intergeneric hybrids Naturally occurring hybrids between genera in the subtribe include: × Borzicana M.H.J.van der Meer = Borzicactus × Matucana × Haagespostoa G.D.Rowley = Haageocereus × Espostoa × Harricereus M.H.J.van der Meer = Harrisia × Cereus × Leia M.H.J.van der Meer = Leucostele × Sohrensia × Leucomoza M.H.J.van der Meer = Denmoza × Leucostele × Oreonopsis G.D.Rowley = Echinopsis × Oreocereus × Raustoa M.H.J.van der Meer = Rauhocereus × Espostoa × Weberbostoa G.D.Rowley = Weberbauerocereus × Espostoa × Weinganopsis G.D.Rowley = Weingartia × Echinopsis × Yungastocactus G.D.Rowley Yungasocereus × Cleistocactus
Artificial hybrids include: × Chamaelobivia Y.Itô = Chamaecyparis × Lobivia × Cleistopsis Strigl = Cleistocactus × Echinopsis. × Trichopsis Y.Itô = Echinopsis × Trichocereus × Harrisinopsis G.D.Rowley = Echinopsis × Harrisia
References
External links USDA, ARS, National Genetic Resources Program. Germplasm Resources Information Network - (GRIN). National Germplasm Resources Laboratory, Beltsville, Maryland, June 1, 2007.