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Mitt. Arbeitskreises Mammillaria 26(2): 96-101. 2002
Family: CACTACEAE
Accepted Scientific Name: Mammillaria lasiacantha Engelm.
Proc. Amer. Acad. Arts 3: 261. 1856 Syn. Cact. 5
Origin and Habitat: Zacatecas, Mexico.
Habitat: It grows on limestone slabs and fine gravel.
Synonyms:
- Mammillaria roemeri Wolfg.Krüger & W.Rischer
Mammillaria lasiacantha Engelm.
Proc. Amer. Acad. Arts 3: 261. 1856 Syn. Cact. 5
Synonymy: 22
- Mammillaria lasiacantha Engelm.
- Cactus lasiacanthus (Engelm.) Kuntze
- Chilita lasiacantha (Engelm.) Orcutt
- Ebnerella lasiacantha (Engelm.) Buxb.
- Escobariopsis lasiacantha (Engelm.) Doweld
- Neomammillaria lasiacantha (Engelm.) Britton & Rose
- Mammillaria lasiacantha var. denudata Engelm.
- Cactus lasiacanthus var. denudatus (Engelm.) J.M.Coult.
- Chilita denudata (Engelm.) Orcutt
- Ebnerella denudata (Engelm.) Buxb.
- Mammillaria denudata (Engelm.) A.Berger
- Mammillaria lasiacantha f. denudata (Engelm.) Schelle
- Neomammillaria denudata
- Mammillaria lasiacantha f. wohlschlageri (Repp.) Hoeve
- Escobariopsis lasiacantha subs. wohlschlageri (Repp.) Doweld
- Mammillaria wohlschlageri Repp.
- Mammillaria lengdobleriana Boed.
- Chilita lengdobleriana (Boed.) Buxb.
- Mammillaria neobertrandiana Backeb.
- Mammillaria roemeri Wolfg.Krüger & W.Rischer
- Mammillaria sp. f. cristata SB500 Cuatrocienagas, Coahuila, Mexico
- Mammillaria sp. SB500 Cuatrocienagas, Coahuila, Mexico hort., S.Brack
Mammillaria lasiacantha subs. egregia (Backeb. ex Rogoz. & Appenz.) D.R.Hunt
Mammillaria Postscripts 7: 3 (1998)
Synonymy: 8
- Mammillaria lasiacantha subs. egregia (Backeb. ex Rogoz. & Appenz.) D.R.Hunt
- Escobariopsis lasiacantha subs. egregia (Backeb. ex Rogoz. & Appenz.) Doweld
- Mammillaria egregia Backeb. ex Rogoz. & Appenz.
- Mammillaria stella-de-tacubaya subs. egregia (Backeb. ex Rogoz. & Appenz.) Appenz. & Lizen
- Mammillaria stella-de-tacubaya var. egregia (Backeb. ex Rogoz. & Appenz.) Rogoz. & Plein
- Neomammillaria egregia (Backeb.) Y.Itô
- Mammillaria lasiacantha subs. egregia f. cristata hort.
Mammillaria lasiacantha subs. hyalina D.R.Hunt
Mammillaria Postscripts 6: 6 (1997), nom. nov. (replaced synonym:Cactaceae Mammillaria wohlschlageri Repp. 1989)
Accepted name in llifle Database:
Mammillaria lasiacantha subs. magallanii (F.Schmoll ex R.T.Craig) D.R.Hunt
Mammillaria Postscripts 6: 7 (1997)
Synonymy: 10
- Mammillaria lasiacantha subs. magallanii (F.Schmoll ex R.T.Craig) D.R.Hunt
- Chilita х magallanii (F.Schmoll ex R.T.Craig) Buxb.
- Ebnerella х magallanii (F.Schmoll ex R.T.Craig) Buxb.
- Escobariopsis lasiacantha subs. magallanii (F.Schmoll ex R.T.Craig) Doweld
- Mammillaria lasiacantha f. magallanii (F.Schmoll ex R.T.Craig) W.A.Fitz Maur. & B.Fitz Maur.
- Mammillaria magallanii F.Schmoll ex R.T.Craig
- Neomammillaria х magallanii (F.Schmoll ex R.T.Craig) Y.Itô
- Mammillaria magallani var. hamatispina Backeb.
- Mammillaria roseocentra Boed. & F.Ritter
- Mammillaria magallanii var. roseocentra (Boed. & F.Ritter) Lizen
Description: This is a small solitary or clustered species, that grows almost buried in the soil, it has a characteristic feathered appearance.
Stem: Without latex, flattened, globose, sunken apically, solitary or clumping, 10 - 20 mm high and to 35 mm in diameter.
Roots: Large taproot up to 10 cm long.
Tubercles: Conical, somewhat soft, dark green to brownish green, 3 - 4 mm long, 2 - 3 mm in diameter. The axil is naked
Radial spine: 25 - 32, radiating, straight or curved, feathery , glassy white, 1.5 - 2.3 mm long, soft.
Central spine: None.
Flower: Funnelform, 13 - 15 mm long and wide, whitish to cream- colored with green flush. Inner petals with pink midveins on the sepals. Stigmas are yellow. The placement of the flowers is very different from typical lasiacanthae species, in which the bud emerges from axils very close to the apex, of the plant. Mammillaria roemeri presents its flowers from older areoles, mid way down the body of the plant, in the fashion of Mammillaria crucigeraSN|9075]]SN|1835]] or huitzlipochtlii, although it must be emphasised there is no suggestion of kinship between it and these.
Blooming season: In habitat it flowers between November and January, but in cultivation (Europe) its bloom appear in April.
Fruit: Green, 3 - 4 mm long and 3 mm wide.
Seed: Black, spherical, 1.1 mm long and 0.95 mm in diameter.
Remarks: It is probably only a neotonic (juvenile form which remains so) form of Mammillaria lasiacanthaSN|1835]]SN|9075]] rather than a good species, or a subspecies or simply an aberrant form of one of the Mammillaria lasiancantha group species.. The two plants looks different, but clearly related.
Subspecies, varieties, forms and cultivars of plants belonging to the Mammillaria lasiacantha group
Mammillaria lasiacantha Engelm.: Single or forming Small clusters of 2 or 3 heads. Stems are spherical usually less than 5 cm in diameter. They usually have soft glabrous spines, but in some populations all plants may retain plumose spines at maturity.- Mammillaria lasiacantha var. denudata Engelm.: has always glabrous spines. For all other characteristics it is comparable to the standard Mammillaria lasiacantha. Distribution: Big Bend National Park (Brewster County), Texas.
- Mammillaria lasiacantha subs. egregia (Backeb. ex Rogoz. & Appenz.) D.R.Hunt: It forms small snow-white ball, usually unbranched, deep-seated in substrate and inconspicuous that become somewhat cylindrical with age up to 5 cm in diameter × 2-7 cm tall.
- Mammillaria lasiacantha subs. egregia f. cristata hort.: crested form. It will slowly forms white tangled groups up to 10 cm in diameter.
- Mammillaria lasiacantha subs. hyalina D.R.Hunt
- Mammillaria lasiacantha subs. magallanii (F.Schmoll ex R.T.Craig) D.R.Hunt: Small usually solitary slow growing species with short white spines. Stems globose to club shaped, green, up to 6 cm tall and 4.5 cm in diameter. Distribution: Coahuila and Durango.
- Mammillaria lasiacantha f. wohlschlageri (Repp.) Hoeve: Small plants with a flat fuzzy stem and creamy flowers blooming abundantly in late winter-to early spring. Radial spiness 26-36, glassy white, brown tipped, 2 - 6 mm long.
- Mammillaria magallani var. hamatispina Backeb.: 50-70 creamy-yellowish radial spines with one hooked darker central spine.
- Mammillaria neobertrandiana Backeb.: Nice pink spines, the small winter flowers are pale pink with a pink/brown midstripe. Distribution: Lerdo, Durango.
- Mammillaria roemeri Wolfg.Krüger & W.Rischer: It is a neotonic (juvenile form which remains so) form of Mammillaria lasiacantha. The flower position and its later flowering distinguish it, as well as the spination. It looks different, but clearly related.
- Mammillaria roseocentra Boed. & F.Ritter: radial spines numerous, in two rows, short, especially the inside one, initially beautiful pink, at the apex almost red: Distribution: Durango and Lerdo, Mexico
- Mammillaria sp. f. cristata SB500 Cuatrocienagas, Coahuila, Mexico: is a tiny crest form that may retain plumose spines at maturity.It slowly forms tangled groups up to 20 cm in diameter.
- Mammillaria sp. SB500 Cuatrocienagas, Coahuila, Mexico hort., S.Brack: (M. lasiacantha) Feathery form with tiny stems that resemble golf balls.
Bibliography: Mitt. Arbeitskreises Mammillarienfr. 26(2): 96-101. 2002
Mammillaria roemeri Photo by: Valentino Vallicelli
Mammillaria roemeri Photo by: Valentino Vallicelli
Mammillaria roemeri Photo by: Valentino Vallicelli
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 has not the fame to be easy to cultivate, but in good conditions with excellent ventilation, it grows without difficulty. It is especially sensitive to overwatering. So careful watering and an open mineral potting soil are a must. Avoid the use of peat or other humus sources in the potting mixture. Don't add limestone to the potting mix which must be moderately acidic. Can be sensitive to frost (but if dry they are resistant to -5° C). Requires maximum sun exposure to reach its full potential and to achieve success in flowering. A winter rest that allows the plant to shrivel (perhaps losing up to 25% of its summer height) will encourage flowering and long time survival. Be careful to encourage slow growth. Provide very good ventilation.
Propagation: Direct sow after last frost. (it usually doesn't produces offsets).
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