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Astrophytum myriostigma var. columnare Frič

Family: CACTACEAE · Variety or form of Astrophytum myriostigma

Publication: Život v Přír. 29: 15. 1925

Description

This questionable variety is very similar to the other myriostigmas, it only deviate from the well-known typical form for its more columnar growth and smaller flowers size.

Stem: Slender and more thin, already in the youth phase. Dimension 25-50(-100) cm tall, only 5-8 cm in diameter shaped like a bishop’s headpiece or a star.

Ribs: Few (usually 5).

Flowers: Absolutely smaller than those of A. myriostigma, hardly 2,5 cm in length, pale-yellow, silk-shining, occasionally with an orange gloom.

Origin and Habitat

Mexico. Villar, Cerritos and far north in the area of Tula and Miquihuana in the State of Tamaulipas, Dr. Arroyo in the State of Nuevo Leon.

Habitat: Prefers stony conditions in humus enriched soil, at approximately 1600 m of height of over the sea. I grows often under trees or protected by Hechtia clumps.

Cultivation and Propagation

Although regarded as a choice and difficult plant in cultivation it is relatively easy to grow. It is sometime seen as a grafted plant but grows very well on its own roots too. Use mineral well permeable substratum with little organic matter (peat, humus). Water sparingly from March till October and keep perfectly dry in winter at temperatures from 5 to 15 degrees centigrade. (but it is Hardy to -7°C for short periods) In the rest period no high atmospheric humidity!!

Sun Exposure: Light shade to full sun.

Propagation: Almost exclusively by seed. Plants are sometimes grafted onto column-shaped cacti.