Mammillaria gigantea

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Mammillaria gigantea
Mammillaria gigantea subsp. flavoviruses

Mammillaria gigantea subsp. flavoviruses

Systematics
Order : Clove-like (Caryophyllales)
Family : Cactus family (Cactaceae)
Subfamily : Cactoideae
Tribe : Cacteae
Genre : Mammillaria
Type : Mammillaria gigantea
Scientific name
Mammillaria gigantea
Hildm. ex K.Schum.

Mammillaria gigantea is a species of the genus Mammillaria in the cactus family(Cactaceae). The specific epithet gigantea comes from Latin and means 'enormously large' and refers to the size of the plant.

description

Mammillaria gigantea grows depressed, almost like a cake, often sunken at the top and clad with white wool felt. The blue-green plant body with the densely placed warts is 9 to 10 centimeters high and 15 to 17 centimeters in diameter. The warts carry milky juice . The axillae are covered with white wool. The up to 12 fine-needle, straight and white radial spines are very small with up to 3 millimeters. The 4 to 6  central spines are usually curved and very strong. The bottom is up to 2 inches long. In the new shoot, the central spines are yellow-brown with a dark tip, later they are yellowish, white to horn-colored reddish at the base.

The flowers appear as with all Mammillarias in wreath. They are green-yellow and reach a size and diameter of 15 millimeters. The fruits are pink to greenish. The seeds are brown.

Distribution, systematics and endangerment

Mammillaria gigantea is distributed in the Mexican states of Guanajuato , Durango , San Luis Potosí and Querétaro in mountainous regions between 1750 and 2400 meters.

It was first described in 1898 by Karl Moritz Schumann .

Synonyms are the following described species and varieties:
Neomammillaria hamiltonhoytiae Bravo (1931), Mammillaria hamiltonhoytiae (Bravo) Werderm. (1931), Mammillaria gigantea subsp. hamiltonhoytiae (Bravo) Rogoz. Plein (2003), Mammillaria armatissima Craig (1945), Mammillaria ocotillensis Craig (1945), Mammillaria hastifera Krainz & A. Keller (1946) and Mammillaria saint-pieana Backeb. ex Mottram (1980).

The following subspecies are distinguished:

  • Mammillaria gigantea subsp. gigantea :
    The nominate form has yellowish green flowers. The fruits are cloudy pink to greenish.
  • Mammillaria gigantea subsp. flavovirens Rogoz. & Plein :
    The subspecies was originally described by Joseph zu Salm-Reifferscheidt-Dyck as Mammillaria flavovirens . Rogozinski and Plein included it in 2003 as a subspecies of Mammillaria gigantea . The flowers are bright lemon yellow, rarely almost white. The fruits are red.

In the Red List of Threatened Species of the IUCN , the species is called " Data Deficient (DD) ", i. H. with insufficient data.

proof

literature

  • Edward F. Anderson : The Great Cactus Lexicon . 2nd Edition. Eugen Ulmer KG, Stuttgart 2011, ISBN 978-3-8001-5964-2 , pp. 382 .
  • 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. 85 ( online ).
  • Robert T. Craig: The Mammillaria handbook: with descriptions, illustrations, and key to the species of the genus Mammillaria of the Cactaceae . EP Publishing, University of Wisconsin - Madison 1963, ISBN 0-85409-330-3 , pp. 55-56 .
  • Carl Friedrich Förster : Handbuch der Cacteenkunde in its full scope: Or the most successful cultural information based on the latest experiences, as well as a detailed and precise description and corrected synonymy of all cacti that have become known up to now, and everything in general with regard to these ... Wöller, 1846, S. 350 ( limited preview in Google Book Search).
  • JJ Krook: Handbook for Knowledge, Reproduction and Treatment of all known so far ... F. Favor, Amsterdam 1855, p. 77 .
  • John Pilbeam : Mammillaria The Cactus File Handbook . cactusfile.com, Southampton 1999, ISBN 0-9528302-8-0 , pp. 109 .

Individual evidence

  1. ↑ Urs Eggli, Leonard E. Newton: Etymological Dictionary of Succulent Plant Names . Birkhäuser 2004, ISBN 3-540-00489-0 , p. 93.
  2. ↑ Karl Schumann : Complete description of the cacti (Monographia cactacearum) . J. Neumann, Neudamm 1898, p. 578 ( online ).
  3. ↑ Salm-Dyck, Cacteae in Horto Dyckensi Cultae . 1849, p. 117
  4. ↑ Rogozinski, Helmut - Plein, W., In: Mitteilungsblatt des Arbeitskreis für Mammillarienfreunde . Vol. 27, 2003, Issue 3, pp. 138-143.
  5. ↑ Mammillaria gigantea in the IUCN Red List of Threatened Species 2013.2. Posted by: Gómez-Hinostrosa, C., Sánchez, E., Guadalupe Martínez, J. & Bárcenas Luna, R., 2009. Retrieved December 27, 2013.

Web links

Commons : Mammillaria gigantea  - album with pictures, videos and audio files