Mammillaria dioica
Mammillaria dioica
Mammillaria dioica is a plant of the genus Mammillaria in the cactus family ( Cactaceae ). The specific epithet means ' dioecious '.
Description
Mammillaria dioica grows singly or clumping. The blue- green, cylindrical stems with rounded apex, up to 33 inches high and 3 to 7 centimeters in diameter. The short cylindrical shaped warts are firm and without latex. The occupied with wool axillae have 4 to 15 bristles, which are as long as the warts. The 1-4 central spines (sometimes absent) are brown to brownish black, acicular, spreading, vigorous. They are similar to radial spines, the lowermost hooked, the highest straight ascending and 0.8 to 1.5 inches long. The 11 to 22 radial spines are needle-like, straight, white, and 0.5 to 0.7 inches long.
The flowers are funnel-shaped 1 to 3 inches long and functionally dioecious ( dioecious ), to which the name suggests. They are white to yellowish white, sometimes with a red center stripe. The fruits are ovoid or clavate and scarlet. They contain black seeds.
Distribution, systematics and hazard
Mammillaria dioica is used in the U.S. in the state of California and the Mexican states of Sonora, Baja California and Baja California South.
The first description was in 1897 by Mary Katharine Brandegee.
Synonyms are following subspecies, varieties and forms described: Neomammillaria dioica ( K.Brandegee ) Britton & Rose ( 1923), Ebner Ella dioica ( K.Brandegee ) Buxb. (1951 ), Chilita dioica ( K.Brandegee ) Buxb. (1954, nom. Inval. ICBN article 33.3), Cochemiea dioica ( K.Brandegee ) Doweld (2000), Mammillaria fordii Orcutt (1902 ), Mammillaria incerta Parish ex Jepson (1936 ), Mammillaria dioica var incerta ( Parish ex Jepson ) Munz (1957 ), Mammillaria dioica fa. incerta ( Parish ex Jepson ) Neutel. (1986 ), Mammillaria goodridgii var rectispina EYDawson (1952) and Mammillaria rectispina ( EYDawson ) Repp. (1987).
In the Red List of Threatened Species IUCN, the type is known as " Least Concern ( LC) ," ie, than not led at risk.