Mammillaria sheldonii
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Mammillaria sheldonii |
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| Mammillaria sheldonii | ||||||||||||
| ( Britton & Rose ) Boed. |
Mammillaria sheldonii is a species of the genus Mammillaria inthe cactus family (Cactaceae). The epithet of the species honors the American Charles Alexander Sheldon (1867–1928), nature lover and owner of a mining company in Mexico.
description
The plants branch out from the base and usually form small cushions. The slender, cylindrical shoots are dull green, often reddish and reach heights of growth of 8 to 20 centimeters with diameters of up to 6 centimeters. The cylindrical, keel-shaped warts on four sides at the base do not contain any milky sap . The axillae are bare and sometimes have some bristles. The 1 to 4 strong central spines are up to 15 millimeters long. The lower one is stretched and either straight or hooked. The 9 to 24 radial spines are white with dark tips and are 6 to 8 millimeters long.
The funnel-shaped, light violet-pink flowers are 2 inches long and in diameter. The edges of the petals are paler and almost white. The flower often opens for several days. The stamens consist of light purple stamens and orange-yellow anthers . The pen is light pink to yellow. The light olive, 3 to 5 millimeters long stigma is 6 to 8 parts and protrudes over the stamens by about 4 millimeters.
The club-shaped, pale scarlet-red fruits have a slightly sloping flower remnant, are 25 to 30 millimeters long and contain black, spherical seeds .
Systematics and distribution
Mammillaria sheldonii is common in the Mexican states of Chihuahua and Sonora .
It was first described as Neomammillaria sheldonii in 1923 by Nathaniel Lord Britton and Joseph Nelson Rose . Friedrich Bödeker placed them in the genus Mammillaria in 1933 . Simultaneously with the publication of Neomammillaria sheldonii , Britton and Rose described the species Neomammillaria swinglei named after Walter Tennyson Swingle , which was later recombined by Bödeker as Mammillaria swinglei and is now also regarded as a synonym .
The species Mammillaria gueldemanniana Backeb described later . (1941), Mammillaria alamensis R.T. Craig (1945), Mammillaria guirocobensis R.T. Craig (1945), Mammillaria inaiae R.T. Craig (1945) and Mammillaria marnieriana Backeb. (1952), Mammillaria swinglei var diabloa P.C. Fischer (1992) are also synonyms. By recombining the genera Chilita and Ebnerella, there are further synonyms of the above species.
proof
literature
- Edward F. Anderson : The Great Cactus Lexicon . Eugen Ulmer KG, Stuttgart 2005, ISBN 3-8001-4573-1 , p. 409 .
- Curt Backeberg : Die Cactaceae: Handbuch der Kakteenkunde . 2nd Edition. tape V . Gustav Fischer Verlag, Stuttgart New York 1984, ISBN 3-437-30384-8 , p. 3291 f. and 3298 f .
Individual evidence
- ↑ Urs Eggli, Leonard E. Newton: Etymological Dictionary of Succulent Plant Names . Birkhäuser 2004, p. 220 ff.
- ^ NL Britton , JN Rose : The Cactaceae. Descriptions and Illustrations of Plants of the Cactus Family . tape IV . The Carnegie Institution of Washington, Washington 1923, p. 156 ff . ( online ).
- ↑ A Mammillaria Comparison Key . Neumann, Neudamm 1933, p. 30
- ^ NL Britton , JN Rose : The Cactaceae. Descriptions and Illustrations of Plants of the Cactus Family . tape IV . The Carnegie Institution of Washington, Washington 1923, p. 158 ff . ( online ).
- ↑ Mammillaria swinglei var diabloa . In: Cactus and Succulent Journal . Vol. 64, No. 5, Los Angeles 1992, pp. 245-246.
