Mammillaria duwei Rogoz. & P.J.Braun
Mammillaria crinita subsp. duwei, Mammillaria nana subsp. duwei, Mammillaria trichacantha subsp. duwei
Mammillaria duwei is a small, solitary, rarely offsetting cactus with stem up to 1.6 inches (4 cm) tall and up to 2.4 inches (6 cm) in diameter. The stem is dark green, with 28 to 36 radial spines. They are thin, white, brownish at base, interlacing and densely wrapped against the body. The central spine is yellowish, hooked, and is not present on all clones. The flowers are funnel-shaped, yellowish-cream to light yellow and up 0.8 inches (2 cm) in diameter.
USDA hardiness zones 9b to 11b: from 25 °F (−3.9 °C) to 50 °F (+10 °C).
To encourage better flowering, allow the plants to enjoy a cooling period in the winter and suspend watering. Unlike many other cacti, which use their ribs as storage devices, Mammillaria feature raised tubercles, from which spines emerge. When you water, the tubercles will expand to allow for increased water storage. The flowers emerge from the axils of these tubercles on the previous year's growth, which accounts for their interesting halo effect. It's imperative that the cactus is not exposed to prolonged dampness and sitting water. Never let your cactus sit in a dish of water. Lastly, make sure to fertilize during the growing season for the best results.
Repot as needed, preferably during the warm season. To repot Mammillaria, make sure the soil is dry before repotting, then gently remove the pot. Knock away the old soil from the roots, making sure to remove any rotted or dead roots in the process. Treat any cuts with a fungicide. Place the plant in its new pot and backfill with potting soil, spreading the roots out as you repot. Leave the plant dry for a week or so, then begin to water lightly to reduce the risk of root rot… – See more at: How to Grow and Care for Mammillaria
Mammillaria duwei is endemic to Mexico, where it occurs only in the state of Guanajuato.
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|Family:||Cactaceae (kak-TAY-see-ee) (Info)|
|Genus:||Mammillaria (mam-mil-AR-ee-uh) (Info)|
|Species:||crinita subsp. duweii|
|Synonym:||Mammillaria nana subsp. duwei|
|Synonym:||Mammillaria duwei var. longispina|
Drought-tolerant suitable for xeriscaping
Average Water Needs Water regularly do not overwater
USDA Zone 9b: to -3.8 °C (25 °F)
USDA Zone 10a: to -1.1 °C (30 °F)
USDA Zone 10b: to 1.7 °C (35 °F)
Can be grown as an annual
Plant has spines or sharp edges use extreme caution when handling
Allow cut surface to callous over before planting
From seed direct sow after last frost
Allow unblemished fruit to ripen clean and dry seeds
Unblemished fruit must be significantly overripe before harvesting seed clean and dry seeds
Properly cleaned, seed can be successfully stored
This plant is said to grow outdoors in the following regions:
On Apr 28, 2005, palmbob from Acton, CA (Zone 8b) wrote:
small, neat offsetting globoid cactus with small, nearly harmless spines (wrapped against body of cactus), though fairly variable, with some plants having very nasty, hooked spines. Delicate cactus with a tendency to rot if the body of the plant gets wet, particularly if very hot or cold out.
Scientific name: Mammillaria duweiRogozinski & Braun
In: Kakt. and. Sukk. 36(8): 158-164 1985
Origin: Garden origin (Nursery produced cultivar) Mexico (Guanajuato and Queretaro)
Conservation status: Listed in CITES appendix 2.
Description: Small solitary rarely offsetting plants that eventually forms tiny mounds.
Stems: Heads 3,5 to 6 cm in diameter, 2 - 4 cm high, dark green, soft, globoid, flattened-globose , to shortly cylindrical. .
Tubercles: S mall, clavate 4-5 mm high, With a woolly axil and little hair.
Central spines: 0 - 1 or 2 (occasiaonally 4). The long central spine is not present on all the clones, yellowish, hooked, to 8 mm long, pubescent.
Radial spines: 28 - 36, acicular, thin, white, brownish at base, pubescent, 3.5 - 4 mm long , interlacing and densely wrapped against the body of the cactus
Flowers: Funnel-form, less deeply set, yellowish/cream to l ight yellow, about 20 mm long and in diameter. Inner segments lanceolate, widely spreading, accuminate, style and stigma lobes greenish.
Blooming season: Flowers readily, and for a long period from spring to the early summer ..
Fruit: Light red to red , elongated .
Seed: Blackish brown.
The little yellow flowers appear in a ring through the crown of the plant in springtime.
Photo of conspecific taxa, varieties, forms and cultivars of plants belonging to the Mammillaria crinita complex (This taxon has lots of synonyms (like most mammillaria ) with several controversial varieties and subspecies) :
Accepted Scientific Name: Mammillaria crinita subs. duwei (Rogoz. & P.J.Braun)
[Basionym: Mammillaria duwei Rogoz. & P.J.Braun 1985]
Origin and Habitat: This species is found at one location northeast of the city of Guanajuato, Mexico (extent of occurrence and area of occupancy 35 km2).
Altitude range: 1.800 - 2.000 metres above sea level.
Habitat: This species is found on volcanic rock in xerophyllous scrub. Mammillaria duwei is known from only one location, has a small population size, and there is a continuing decline due to overcollection and development. The southernmost of the two known subpopulations of this species has declined as a result of collecting over the past 15 years. Currently the total population is estimated at approximately 500 individuals.
Description: Mammillaria duwei is a small solitary rarely offsetting plants that eventually forms tiny mounds.
Taxonomic Notes: Mammillaria duwei is considered a synonym of Mammillaria crinita by Anderson (2001) and by Fitz Maurice (2002). Considered a provisional species by Hunt (1999) and a subspecies of Mammillaria nana by Pilbeam (1999).
Stems: Heads 3,5 to 6 cm in diameter, 2-4 cm high, dark green, soft, globoid, flattened-globose, to shortly cylindrical.
Tubercles: Small, clavate 4-5 mm high, With a woolly axil and little hair.
Central spines: 0-1 or 2 (occasiaonally 4). The long central spine is not present on all the clones, yellowish, hooked, to 8 mm long, pubescent.
Radial spines: 28-36, acicular, thin, white, brownish at base, pubescent, 3,5-4 mm long, interlacing and densely wrapped against the body of the cactus.
Flowers: Funnel-form, less deeply set, yellowish/cream to light yellow, about 20 mm long and in diameter. Inner segments lanceolate, widely spreading, accuminate, style and stigma lobes greenish.
Blooming season: Flowers readily, and for a long period from spring to the early summer.
Fruits: Light red to red, elongated.
Seeds: Blackish brown.
Subspecies, varieties, forms and cultivars of plants belonging to the Mammillaria crinita complex
Notes: This plant is a member of the Mammillaria crinita complex (Stylothele Series). Only some authors consider Mammillaria duwei to be a good species the others classify it as M. crinita (e.g. According to Anderson's classification, this species is considered as a synonym of Mammillaria crinita)
Bibliography: Major references and further lectures
1) David Hunt, Nigel Taylor “The New Cactus Lexicon” DH Books, 2006
2) Edward F. Anderson “The Cactus Family” Timber Press, 2001
3) Rod Preston-Mafham, Ken Preston-Mafham "Cacti: the illustrated dictionary" Timber Press, 1991
4) John Pilbeam (1999) "Mammillaria The Cactus File Handbook" - page 203.
5) Fitz Maurice, B & Fitz Maurice, W.A. 2013. Mammillaria duwei. The IUCN Red List of Threatened Species. Version 2014.3. . Downloaded on 31 May 2015.