Astrophytum myriostigma v. ornatum

Astrophytum myriostigma v. quadricostatum. 

Astrophytum myriostigma v. tulense. Tamaulipas: near Tula. Tall, columnar stem with dense white flecks and small yellow flowers. 

Astrophytum niveum.

Astrophytum ornatum (Bishops cap). Sunset: 11-13,18-21; USDA: 9b-10. Light shade. Heat tolerant. Little water. Hardy to 20°F. Solitary barrel grows to 4' tall; 10" in diameter. Origin: Vista Hermosa/Queretaro/Mexico. 

Astrophytum ornatum v. glabrescens

Astrophytum ornatum v. mirbellii.

Astrophytum ornatum v. virens

Astrophytum sanjuanensis

Astrophytum senile. Quantities over 100 ships in 2-3 weeks.

Astrophytum senile v. aureum.