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Accepted Scientific Name: Mammillaria grusonii C.Runge
Gartenflora xxxviii. (1889) 105. fig. 20. ( "grusoni" )
Origin and Habitat: Coahuila and Durango, Mexico
Altitude: 1250-1500 m
Habitat: together with Coryphantha durangensis, Ferocactus hamatacanthus and Thelocactus bicolor, Echinocereus stramineus, Opuntia kleiniae, Opuntia violacea, Opuntia herrfeldtii, Opuntia imbricata, Euphorbia antisyphilitica, Yucca thompsoniana, Larrea tridentata, and Jatropha dioica.
Mammillaria grusonii C.Runge
Gartenflora xxxviii. (1889) 105. fig. 20. ( "grusoni" )
- Mammillaria grusonii C.Runge
- Mammillaria durangicola Repp.
- Mammillaria mexicensis R.T.Craig
- Mammillaria pachycylindrica Backeb.
- Mammillaria papasquiarensis (Bravo) Repp.
- Mammillaria tesopacensis var. papasquiarensis Bravo ex S.Arias, U.Guzmán & S.Gama López
- Mammillaria zeyeriana F.Haage ex K.Schum.
- Neomammillaria zeyeriana (F.Haage ex K.Schum.) Fosberg
Description: Mammillaria zeyeriana is one of the largest species in the genus and usually solitary. It is also known by many to be synonymous with Mammillaria grusonii, but not sufficiently differentiated and considered merely a local variant of the latter (if not the same). It has spines of intermediate measurement, of which the radials are 10 to 15, 8-15 mm long, and the centrals are usually 4 stronger than the radial, 12-25 mm long. The flowers are similar to the type species.
Habit: It is usually solitary (it has a tendency to remain the same in the culture). It reveals its true beauty only as it becomes 6-10 years old, and reaches 20 cm or more in diameter.
Stems: Hemispherical or conical to short cylindrical, pale greyish green, up to 15(-30) cm tall and 10-25 cm in diameter.
Tubercles: Conical, terete, in 13 or 21 spirals, basally four-angled, slightly carinate, 10 to 12 mm tall, without latex, the axil is naked or sparingly woolly.
Areoles: Elliptic, 3 mm long.
Radial spines: 10-15, straight, needle-like, upper ones shorter, 8-15 mm long, at whitish to reddish, tipped brown, later grey or snowy- white.
Central spines: Usually 4 (but sometime up to 6), straight, stronger than the radial, brownish, the uppermost one curved, one descending, 12 - 25 mm long.
Flowers: Bell shaped, funnel-form, diurnal, light yellow-cream or pinkish with darker (brown or purple) midstripe with a yellowish throat, up to 25 mm long and in diameter.
Blooming season: Spring, and flowers remain open for about three or four days.
Fruits: Scarlet, club shaped.
Subspecies, varieties, forms and cultivars of plants belonging to the Mammillaria grusonii group
- Mammillaria durangicola Repp.: This form has 10-16 radials, 4-15 mm long, 1 - 3 central, 10-17mm long, black, and flowers as in Mammillaria pachycylindrica, with a brownish midstrip.
- Mammillaria grusonii C.Runge: It is one of the largest species in the genus and usually solitary, it reaches 30 cm or more in diameter.
- Mammillaria mexicensis R.T.Craig: has dark pink flowers.
- Mammillaria pachycylindrica Backeb.: (Reppennhagen considered it a separate form) with more spines, 20–23 grayish-white radials and about 6 centrals, at first dark, blackish-brown, becoming gray, tepals lobes with a wide brownish-pink midstrip.
- Mammillaria papasquiarensis (Bravo) Repp.: is a long spined form, with 8-10 radial spines, 5-40 mm long, and 1 to 3 central spines, 40 - 100 mm long. The flowers are white with a pinkish midstrip.
- Mammillaria tinuvieliae Laferr.
- Mammillaria zeyeriana F.Haage ex K.Schum.: The spines are of intermediate measurement, of which the radials are 10 to 15, 8-15 mm long, and the centrals usually 4 (but sometime up to 6), 12 - 25 mm long. The flowers are similar to those of Mammillaria papasquiarensis.
Bibliography: Major references and further lectures
1) John Borg “Cacti: a gardener's handbook for their identification and cultivation” Blandford P., 1970
2) Nathaniel L. Britton, J. N. Rose “Cactaceae: Descriptions and Illustrations of Plants of the Cactus” Volume IV. The Carnegie Institution of Washington Washington, 24/Dec/1923
3) Edward Anderson “The Cactus family” Timber Press, Incorporated, 2001
4) James Cullen, Sabina G. Knees, H. Suzanne Cubey "The European Garden Flora Flowering Plants: A Manual for the Identification of Plants Cultivated in Europe, Both Out-of-Doors and Under Glass" Cambridge University Press, 11/Aug/2011
5) David R Hunt; Nigel P Taylor; Graham Charles; International Cactaceae Systematics Group. "The New Cactus Lexicon" dh books, 2006
6) John Pilbeam “Mammillaria: the cactus file handbook” Cirio Publishing Services Ltd Dec/30,/1999
Mammillaria zeyeriana Photo by: Cactus Art
The gallery now contains thousands of pictures, however it is possible to do even more. We are, of course, seeking photos of species not yet shown in the gallery but not only that, we are also looking for better pictures than those already present. Read More...
Cultivation and Propagation: This plant blooms easily and needs lots of light. Use a pot with good drainage and a very porous mineral-based potting mix. Potted plants are quite wet-sensitive, especially in light of its small root system. Water sparingly during the growing season, let soil dry in between to prevent root rot, keep very dry in winter. Feed with a high potassium fertilizer in summer.
Usually it is recommended to over-winter this plant in a bright and warm greenhouse with at least 8-10° C , but it has proven to be quite frost resistant (if kept dry it is hardy as low as -7° C). A resting period in winter and strong light are necessary so that it can flower properly. Plants will offset readily, and dense clumps can be produced in a very few years.
Propagation: Through seeds and cuttings.
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