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406.0000 Family Cactaceae Juss.; Gen. Pl. [Jussieu] 310 (1789), nom. cons.
ca. 140-170 genera (circumscription still very much in flux), ca. 1700-1800 spp. Latest phylogeny: de Vos et al. (2025). There has been excessive splitting, leading to over 3000 species in some collectors view. It should be good practice in the future that each ´new species´ description is confirmed by molecular genetics, not only by morphology.
Species listed in database: 1819; hybrids: 79
= Cereaceae DC. & Spreng.(transl.Jameson); Elem. Philos. Pl. 142 (1821)
= Mammillariaceae D.L.Fu; Amer. J. Agric. Forest. 12(5): 352 (2024)
= Nopaleaceae E.Schmid & Curtman; Pflanzenreich [Petermann] 2: 135 (1856)
= Opuntiaceae Desv.; Dict. Rais. Bot. 52, 385 (1817)
406.6911 Genus Pygmaeocereus H.Johnson & Backeb.; Natl. Cact. Succ. J. 12: 86 (1957)
Distribution: Peru. Not sampled in the phylogeny of de Vos et al. (2025)
Species listed in database: 2
species :
Pygmaeocereus bieblii Diers; Kakteen And. Sukk. 46(11): 259 (1995)
subspecies :
subsp. bieblii
Distribution: Peru (?Ancash)
83 PER
Synonyms: hidden
= Haageocereus bieblii (Diers) Lodé; Cact.-Advent. Int. (Almeria) 98(Suppl.): 4 (2013)
subspecies :
subsp. kuehhasii (Diers) Ostolaza; Cactus Perú 404 (2014)
Distribution: Peru
83 PER
Synonyms: hidden
= Haageocereus bieblii subsp. kuehhasii (Diers) Lodé; Cact.-Advent. Int. (Almeria) 98(Suppl.): 4 (2013)
= Pygmaeocereus bieblii var. kuehhasii Diers; Kakteen And. Sukk. 58(3): 72 (2007)
species :
Pygmaeocereus bylesianus Andrae & Backeb.; Natl. Cact. Succ. J. 12: 86 (1957)
Distribution: S-Peru
83 PER
Synonyms: hidden
= Arthrocereus bylesianus (Andrae & Backeb.) Buxb.; Kakteen And. Sukk. 20: 97 (1969)
= Arthrocereus rowleyanus (Backeb.) Buxb.; Kakteen And. Sukk. 20: 97 (1969)
= Echinopsis bylesiana (Andrae & Backeb.) Mayta; Succulentopia 14: 14 (2015)
= Echinopsis familiaris (F.Ritter) Mayta & Molinari; Succulentopia 14: 14 (2015)
= Haageocereus bylesianus (Andrae & Backeb.) Lodé; Cact.-Advent. Int. (Almeria) 98(Suppl.): 5 (2013)
= Haageocereus familiaris (F.Ritter) Lodé; Cact.-Advent. Int. (Almeria) 98(Suppl.): 5 (2013)
= Pygmaeocereus akersii H.Johnson; (1955) (non Backeb.)
= Pygmaeocereus familiaris F.Ritter; Kakteen Südamerika 4: 1428 (1981)
= Pygmaeocereus rowleyanus Backeb.; Cactaceae [Backeberg] 6: 3718 (1962), nom. illeg.
= Pygmaeocereus vespertinus H.Johnson; (nomen)
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A complete, synonymic checklist of the Higher Plants of the World

Version 25.10 (Oct. 12th, 2025)

Covering 357,450 accepted species,
8,806 hybrids, 48,075 accepted infraspecific taxa and 1,004,944 synonyms,
in total 1,419,285* names

[*about 25,000 dubious, "unplaced" names and about 4,000 invalid names (Art. 24.3) like "typicus" are deliberately omitted]

With complete, detailed distribution data (countries and regions) and literature references

Arranged in linear phylogenetic sequence reflecting true relationships

Fully searchable and continously updated

With 38,209 pictures of 15,787 species

Assembled through 40 years independently from other databases

In cooperation with Catalogue of Life