Astrophytum, Cact. Gen. Sp. Nov.: 3-6. 1839 sec. Vázquez-Lobo & al. 2015
- Type: Astrophytum myriostigma
- =Maierocactus in Z. Sukkulentenk. 2(8): 138-142. 1925 syn. sec. POWO 2017+
- Type: Maierocactus capricornis
- –Digitostigma in Cact. Suc. Mex. 47: 79. 2002, nom. inval., syn. sec. Vázquez-Lobo & al. 2015
Phylogenetics: Confirmed as monophyletic, including Digitostigma, therefore transfer of Digitostigma to Astrophytum, as previously suggested by Hunt (2003) is justified (Vázquez-Sánchez & al. 2013, Vázquez-Lobo & al. 2015). Based on those two studies, Astrophytum includes six species grouped into two clades. A. caput-medusae D.R.Hunt is recognized as the sister of A. coahuilense (H.Moeller) K.Kayser, A. capricorne (A.Dietr.) Britton & Rose, and A. asterias (Zucc.) Lem., while A. myriostigma Lem. and A. coahuilense form another independent clade. It is supported that A. coahuilense is not conspecific with A. myriostigma.A
Category B. The genus is monophyletic based on phylogenetic studies that support the clade based on a sufficiently dense or even complete sampling, or support a monotypic genus as a distinct lineage, but do not provide a new taxonomic treatment at the species level. In many cases, older classical taxonomic synopses or a monographic treatment exist for these genera providing a reliable assessment of the species included.
A. Arias, S. 2021: Revisions of Acanthocereus, Aporocactus, Astrophytum, Bergerocactus, Cephalocereus, Disocactus, Marshallocereus, Nyctocereus, Pachycereus, Peniocereus, Pereskiopsis, Selenicereus, Stenocereus, Strophocactus. – In: Korotkova N. & al., Cactaceae at Caryophyllales.org – a dynamic online species-level taxonomic backbone for the family. – Willdenowia 51: 251-270