Mammillaria grusonii
{{Short description|Species of cactus}}
{{Speciesbox
|image = Cactaceae - Mammillaria grusonii.JPG
|image_caption = Mammillaria grusonii at the botanical garden of Villa Durazzo-Pallavicini, Genova Pegli
|genus = Mammillaria
|species = grusonii
|authority = Runge
|synonyms =
- Mammillaria zeyeriana F.Haage ex K.Schum. (1898)
- Mammillaria grusonii var. zeyeriana (F.Haage ex K.Schum.) E.Kuhn (1980)
- Mammillaria pachycylindrica Backeb. (1959)
- Mammillaria grusonii var. pachycylindrica (Backeb.) E.Kuhn (1980)
- Mammillaria tesopacensis var. papasquiarensis Bravo (1966)
- Mammillaria papasquiarensis (Bravo) Repp. (1987)
- Mammillaria durangicola Repp. (1987)
}}
Mammillaria grusonii is a cactus in the genus Mammillaria of the family Cactaceae. The epithet grusonii honors the inventor, scientist, industrialist and cacti collector Hermann Gruson of Magdeburg.
Description
Mammillaria grusonii usually grows singly. This cactus is spherical to thick cylindrical, bright green, with a diameter of about {{convert|25|cm}}. The tubercles are four-angled and contain latex. The axillae are initially woolly, later naked. The spines are straight, reddish and becomes white with age. The two central spines are 0.4 to 0.6 centimeters long, while the 12 to 14 radial spines are 0.6 to 0.8 centimeters long. The pale yellow, bell-shaped flowers are up to 2.5 centimeters long and have an equal diameter. The fruits are bright scarlet and contain brown seeds.
Distribution
References
- {{citation|surname1=Ulises Guzmán|surname2=Salvador Arias|surname3=Patricia Dávila|title=Catálogo de cactáceas mexicanas |publisher=Universidad Nacional Autónoma de México|pages=140|isbn=970-9000-20-9|date= 2003}}
- [https://web.archive.org/web/20111012025223/http://mammillarias.net/gallery/mammillaria_species.php?searchstring=grusonii&lg=uk Mammillarias.net]
- [https://web.archive.org/web/20160304132015/http://www.mammillarias.net/gallery/dm/grusonii Distribution Map]
- [http://cactiguide.com/cactus/?genus=Mammillaria&species=grusonii Cacti Guide]
- [http://www.desert-tropicals.com/Plants/Cactaceae/Mammillaria_grusonii.html Desert-tropical]
{{Taxonbar|from=Q1354228}}
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