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    The Genus Geohintonia:

Genus Geohintonia Glass & W. A. Fitz Maurice 1991 

Monospecific genus, only consists of Mexican Geohintonia, Glass & W.A. Fitz Maurice 1991, very next one to the Aztekium sort. In fact, George S. Hinton discovered Mexican Geohintonia shortly to the same habitat that Aztekium hintonii. During some time the hypothesis that it was a natural hybrid of Aztekium was considered. Their flowers are similar, but they present hairiness in the base of the segments of perianthus and they open during the morning, not at the dusk like in  Aztekium. In addition, the Aztekium has lateral grooves in the ribs. The philogenetic studies of the DNA, in Cacteae of Charles A. Butterworth, J. Hugo Level-Sanchez and Robert S. Wallace (2002), locate Geohintonia very next  to Aztekium, cataloging  them as one of the most primitive genera in the Cactaceae.


 Geohintonia mexicana

Its name derives from the name of its discoverer, Hinton, with the prefix "Geo". Geohintonia mexicana grows in Mexico, Nuevo Leon, on limestone walls of the Sierra Madre Western Mountain, sharing habitat with the most abundant Aztekium hintonii.

Its simple stem, of color green-blue-gray, is globular, of 10cm of height and 11cm of diameter, with the sunk apex woolly covered. The ribs, between 18 and 20, of 16 mm, without tubercles, are well defined, smooth and becoming with the time scorched and fragiles. The areolas, that grow in the edge of the ribs, are oval, of 3mm of length and 2mm of thickness, first fleecy and soon naked. The 3 spines, of 3 to 12mm of length are bent, in spoon form.

 

The flowers appear from the apex, open from the dusk to the night and have form of funnel of intense pink color or magenta. They display some long hairs in the armpits of the segments of perianthus.

The fruit is hidden between the apical wool, of 9mm of length, with irregular dehiscence, conserves adhered rest of perianthus. The seeds are long of 1,2mm, of shining black color.

Its culture is difficult, very slow from seeds, but it is possible to be cultivated without grafting to maintain its characteristics intact. It requires a mineral substratum with very good drainage.

By Vicente Bueno, Notable Dr. Good of Cactus Center Club