Mammillaria tetrancistra
Mammillaria tetrancistra
Mammillaria tetrancistra is a species of the genus Mammillaria in the cactus family ( Cactaceae ). The specific epithet tetrancistra means (Latin tetrancistrus ) with four hooks ( thorns ) '.
Description
Mammillaria tetrancistra grows individually or in groups forming with tuberous roots. The cylindrical to oval-shaped shoots are light green to gray. They grow to 25 inches tall and 3-8 inches tall in diameter. The cylindrically shaped warts cause no milk juice. The axillae are studded with bristles. The 3-4 central spines are acicular, brown or even black. They are 1.4 to 2.5 inches long, with the bottom are hooked. The 30 to 60 radial spines are arranged in two rows. They are each other hair -like, the extreme strong, white with dark tip and 6 to 10 millimeters long.
The lavender flowers are edged with white. They are up to 2.5 inches long having a diameter of 2.5 to 3.5 centimeters. The red fruits are up to 1.2 inches long. They contain dome-shaped, black, pitted seeds with an eye-catching, corky appendage.
Distribution, systematics and hazard
Mammillaria tetrancistra is common in the U.S. states of California, Arizona, Nevada and Utah, and in the Mexican states of Baja California and Sonora.
The first description was in 1852 by George Engelmann. Synonyms of Mammillaria tetrancistra Engelm. are Phellosperma tetrancistra ( Engelm. ) Britton & Rose ( 1923) and Bartsch Ella tetrancistra ( Engelm. ) Doweld ( 2000).
In the Red List of Threatened Species IUCN, the type is known as " Least Concern ( LC) ," ie, than not led at risk.