A sweet little mat forming plant, with long-lasting flowers and ornamental fruits. A very nice addition to any collection!
Family: Cactaceae (Cactus Family)
Scientific name: Mammillaria glassii var. glassii R.A. Foster
Pubblicated in: R.A. Foster, Cact. Succ. J. (US) 40(4): 132 (1968)
Origin: Sierra. Madre Oriental, Coahuila, Tamaulipas and Nuevo Leon, Mexico Altitude 1.450 - 2.250 m.
Conservation status: Listed in CITES appendix 2.
- Mammillaria glassii subsp. glassii
- Bartschella glassii
- Mammillaria ascensionensis Reppenhagen 1979
- Mammillaria glassii subsp. ascensionensis (Reppenhagen) D.R. Hunt 1997
- Mammillaria glassii var. siberiensis Lau
- Bartschella glassii ssp. siberiensis
- Mammillaria glassii var. nominis-dulcis
M. glassii is a sweet little mat forming plant, that offsets heavily and forms a beautiful low white cushion. Flowers very small and pink for two months in Spring.
Description: It is a small rapidly clumping plant that forms large, low clusters, with numerous basal branches, densely covered in fluffy white spines.
Stems: Individual stems are short, globose, becoming cylindrical, 3-10 cm tall.
Tubercles: Cylindrical, up to 7 mm tall, with watery juice (without latex).
Areoles: Circular, naked.
Axil: Furnished with10 to 20 fine, white bristles, up to 25 mm long or almost naked..
Radial spines: 50 - 60, hairlike, white, interlacing, 10 - 15 mm long,
Central spines: 1 to 4, up to 7 mm long, erect, straight or hooked, but difficult to distinguish from radials.
Flower: Very small, funnel shaped, often not opening completely, creamy-yellow to light pink, up to 14 mm long, 3-22 mm across.
Blooming season: It one of the earliest mammillarias to flower in spring.
Fruit: Protruding, very ornamental green, becoming pink-reddish, up to 20 mm long.
Suggested subspecies and variety:
M. glassi ssp. glassii Stems very small, not exceeding 3 cm in diameter, whit numerose axilary bristles and usually only one central spine. Flowers very tiny, narrow (approx 3-4 mm in diameter). Origin: Coahuila, Tamaulipas and Nuevo Leon.
M. glassii ssp. ascensionensis Stems are larger (Up to 10 cm in diameter) axil almost naked withshort wool and few (If any) bristles. Centrla spines 7-7 mm long, flowers larger up to 18-22 mm whide. Origin: Ascension, Nuevo leon.
M.glassii var. siberensis Clumping, heads up to 10 cm in diameter. Floers, white to pale pink, over 2,5 cm across . Origin: Near the town of Siberia in Nuevo Leon
M. glassi var. nomini-dulcis. Flowers very large up to 3 cm in diameter.
Cultivation: It is a slow growing species of easy culture, recommended for any collection, it doesn't require any special treatment. Water regularly in summer, but do not overwater (Rot prone) Use pot with good drainage and a very porous potting media, keep dry in winter. Feed with a high potassium fertilizer in summer. It is quite frost resistant if kept dry, hardy as low as -5° C (some reports give it hardy to -5°C) Sun Exposure: It needs as much light as possible without burning the plant, to encourage the heaviest spine formation. Growth and flowering are improved under these conditions. Can be sunburned if moved from shade/greenhouse into full sun too quickly. During the spring it may be able to take full sun until the heat arrives at the end of spring. In an area that has hot afternoon sun, it may be able to take full morning sun, but requires afternoon shade or afternoon light shade.
It readily forms clumps of many small heads and flowers easily. For best results, use a shallow pot, and only use the smallest diameter pot that will accommodate the plant. Regular water in summer, dry in winter. The use of a covering gravel is a good way to preserve the whiteness of spines.
Propagation: Direct sow after last frost (usually) or division, wait until the offsets that appear at the base of old clustered specimens are 1/3 the size of the parent and then detach and plant.