Astrophytum myriostigma
Astrophytum myriostigma, Bishop's Mitre Cactus, is native to northern and northeastern Mexico where it occurs at altitudes of 750 to 1,500m on very free-draining calcareous substrates. It is famous for its spine-free geometric five-ribbed shape and although some forms do have four or even three ribs, the five-ribbed star shape is the classic Astrophytum myriostigma form. Starting life as a chunky globular plant, Astrophytum myriostigma gradually becomes columnar with age and tall venerable specimens are highly-prized. It freely produces flowers in the summer that are pale yellow and slightly fragrant. The body is covered - to greater or lesser degree - with small white trichomes, tiny patches of microscopic hairs.
Additional Information
| Order | Caryophyllales |
|---|---|
| Family | Cactaceae |
| Sub-Family | Cactoideae |
| Synonyms | Astrophytum coahuilense, Astrophytum columnare, Astrophytum depressum, Astrophytum myriostigma var. cereiforme, Astrophytum myriostigma subsp. coahuilense, Astrophytum myriostigma var. coahuilense, Astrophytum myriostigma var. columnare, Astrophytum myriostigma var. grandiflorum, Astrophytum myriostigma var. minimiflorum, Astrophytum myriostigma var. nudicarpa, Astrophytum myriostigma var. nudum, Astrophytum myriostigma subsp. potosinum, Astrophytum myriostigma var. potosinum, Astrophytum myriostigma subsp. quadricostatum, Astrophytum myriostigma var. quadricostatum, Astrophytum myriostigma var. quadricostatum, Astrophytum myriostigma var. strongylogonum, Astrophytum myriostigma subsp. tamaulipense, Astrophytum myriostigma var. tamaulipense, Astrophytum myriostigma subsp. tulense, Astrophytum myriostigma var. tulense, Astrophytum myriostigma var. verum, Astrophytum prismaticum, Astrophytum quadratum, Astrophytum tulense, Cereus colicochus, Echinocactus myriostigma, Echinocactus myriostigma subsp. coahuilensis, Echinocactus myriostigma var. columnaris, Echinocactus myriostigma f. columnaris, Echinocactus myriostigma var. nudus, Echinocactus myriostigma subsp. potosinus, Echinocactus myriostigma var. quadricostatus, Echinocactus myriostigma subsp. quadricostatus |
| Geographical Origin | Mexico: Nuevo León, San Luis Potosí, Tamaulipas |
| Cultivation | Gritty alkaline mix that is very free-draining. Full sun. Do not water through the winter. Ideal houseplant in a well-lit aspect |
| Eventual Height | 60-90cm |
| Eventual Spread | 12-15cm |
| Hardiness | Cold tolerant but not hardy in the UK. Ok in a cool glasshouse under fleece during the coldest periods |
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