Basis of the account

Astrophytum is my favourite cactus genus. Its variation offers many reasons for close observation. Similar plant outlines can conceal different relationships, while fine details of flowers,…

Bishop's cap. Variable rib number, hair cover and growth form. Two subspecies and numerous horticultural forms.

Astrophytum myriostigma subsp. myriostigma is the nominate subspecies, including the element associated with the species name's type. POWO includes columnare, nudum, potosinum,…

Stem water uptake, seed buoyancy, rib variation, relationships and habitat studies.

The term concerns plants almost lacking white hairs on the stem surface. Areoles remain present. The 2020 study showed continuity between bare, partly hairy and densely hairy plants. The…

An older name associated with a slender stem elongating early. The archive also contains columnaris and minima. In POWO, columnare names are synonyms within subsp. myriostigma. Columnar…

In 2021, Montanucci and Kleszewski recognised tulense through a combination of stem, flower and seed features. In their material, plants were more slender and taller, and flowers usually…

Archived descriptions distinguish rounded, less projecting ribs and a broad growth form. The epithet is now a synonym of the nominate subspecies. Large-flower data come from older…

A historical name associated with treatments of plants from San Luis Potosí. POWO places the corresponding botanical name among synonyms of the nominate subspecies. The atlas retains it as…