Trichocereinae is a
subtribe
Subtribe is a taxonomic category ranking which is below the rank of tribe and above genus. The standard suffix for a subtribe is -ina (in animals) or -inae (in plants). The first use of this word dates back to the late 19th century. An example of ...
of
cactus
A cactus (: cacti, cactuses, or less commonly, cactus) is a member of the plant family Cactaceae (), a family of the order Caryophyllales comprising about 127 genera with some 1,750 known species. The word ''cactus'' derives, through Latin, ...
that are particular to
South America
South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a considerably smaller portion in the Northern Hemisphere. It can also be described as the southern Subregion#Americas, subregion o ...
.
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
Cereeae is a tribe of cacti belonging to the subfamily Cactoideae containing about 50 genera, divided in 2023 among six subtribes.
Description
Cereeae are tree-like or shrubby, sometimes climbing plants. Their mostly elongated to spherical, rib ...
varies. The list below is based on genera accepted by
Plants of the World Online
Plants of the World Online (POWO) is an online taxonomic database published by the Royal Botanic Gardens, Kew.
History
Following the Convention on Biological Diversity, the Royal Botanic Gardens in Kew launched Plants of the World Online i ...
.
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.][
]
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''
* × ''Leucomoza'' M.H.J.van der Meer = ''Denmoza'' × ''Leucostele''
* × ''Oreonopsis'' G.D.Rowley = ''Echinopsis'' × ''Oreocereus''
Artificial hybrids include:
* × ''Chamaelobivia'' Y.Itô = ''Chamaecyparis'' × ''Lobivia''
References
External links
* USDA, ARS, National Genetic Resources Program
Germplasm Resources Information Network - (GRIN)
National Germplasm Resources Laboratory, Beltsville, Maryland, June 1, 2007.
Cacti of South America
Caryophyllales tribes
Long stubs with short prose
{{Cactus-stub