Grazie Ennio.
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I semi DeHerdt della v. De Durango può darsi che non siano relativi a Mammillaria gummifera se identici a quelli spediti ad Ento.
L'ultima modifica di maurillio il Mar 09 Dic 2014, 21:44, modificato 1 volta
La descrizione originale da:
THE CACTACEAE - DESCRIPTIONS AND ILLUSTRATIONS OF
PLANTS OF THE CACTUS FAMILY BY
N. L. BRITTON and J. N. ROSE
10. Neomammillaria hemisphaerica (Engelmann).
Mammillaria hemisphaerica Engelmann in Wislizenus, Mem. Tour North. Mex. 105. 1848.
Mammillaria heyderi hemisphaerica Engelmann, Proc. Amer. Acad. 3: 263. 1856.
Cactus heyderi hemisphaericus Coulter, Contr. U. S. Nat. Herb. 3: 97. 1894.
Cactus hemisphaericus Small, Fl. Southeast. U. S. 811. 1903.
Deep-seated in the soil, hemispheric, 8 to 12 cm. broad, dark green; tubercles only slightly angled, not very closely set, 1 to 1.5 cm. long, somewhat pointed, their axils nearly naked in the dormant stages; spine-areoles woolly when young, becoming glabrate in age; radial spines 9 to 13, widely spreading, acicular, the upper ones more delicate, 4 to 8 mm. long, brownish or smoky, often with black tips; central spine solitary, porrect, brown; flowers small, cream-colored, 1 to 1.5 cm. long;
inner perianth-segments acute; filaments pinkish; style pinkish; stigma-lobes 6 to 10, greenish yellow; fruit slender, clavate, red, 1 to 1.5 cm. long.
Type locality: Below Matamoros on the Rio Grande.
Distribution: Southeastern Texas and northeastern Mexico.
This species was collected in 1846 by the St. Louis Volunteers in the Mexican War and taken back to Dr. George Engelmann; it flowered and he described it briefly in 1848 and in more detail in 1850. It was recently re-collected near Brownsville, Texas, just across the river from Matamoros by Robert Runyon and sent to us with a photograph taken in situ.
This species differs from Neomammillaria applanata in being less flattened and in having fewer spines and white flowers.
Cactus heyderi hemisphaericus, as treated by Coulter, must be a composite, the western and southern forms probably representing different species.
Mammillaria heyderi ssp. hemisphaerica BZ 56 Ciniega de Flores - Nuevo Leon - Messico
Mammillaria heyderi ssp. hemisphaerica BZ 56 Ciniega de Flores - Nuevo Leon - Messico
Mammillaria heyderi ssp. hemisphaerica SB 859 Cameron Co - Texas - U.S.A.
Mammillaria heyderi ssp. hemisphaerica SB 859 Cameron Co - Texas - U.S.A.
Questa sottospecie è distinguibile con facilità per il giallo dei suoi fiori.
La distribuzione è la più occidentale fra tutte le sottospecie, occupando una piccola porzione del sud Arizona, per degradare lungo il confine nello stato messicano di Sonora.
Le spine radiali sono 10/12,lunghe fino a 2cm, bianche o giallastre, le più basse più robuste, con punta bruna o nera.
C'è una singola spina centrale, talvolta 2, giallastra a punta bruna, lunga fino a 10mm, simile alle radiali.
I fiori sono larghi fino a 3cm, color crema o giallo-pallido con striscia mediana più scura.
I frutti sono rossi ed i semi bruno-scuro.
Cresce ad altitudini variabili fra gli 850 ed i 1800m.
Sobbene che non farà piacere al boss trovare questa pagina, ma è quanto di più qualificato abbia potuto trovare su Mammillaria meiacantha....
L'articolo è di Steven Brack, quello di Mesa Garden...
Dal Journal vol.XV - n.2 - anno 1975:
MAMMILLARIA HEYDERI ssp. MEIACANTHA
by Steven Brack
Mammillaria meiacantha is a member of the Macrothelae Series, being in the M. heyderi complex. M. meiacantha's range in the M. heyderi complex is more to the north and central part of the total range, M. heyderi v. macdougalii being found in south central Arizona, v. applanata in S.E. New Mexico, W. Texas and N.E. Mexico, and v. hemisphaerica in S.E. Texas and extreme N.E. Mexico. I have seen v. meiacantha in S.E. New Mexico near Roswell, between Manzano and Los Pinos Mountains S.E. of Belen, on the extreme southern slopes of the Manzano Mountains, and on the S.E.
slopes of the Sandra Mountains near Albuquerque. Its habit of growth varies greatly in these different areas. Near Roswell the plants grow to greater sizes than in the other areas mentioned, and they usually grow in the shade of short thorny bushes. The soil is very hard and rocky. The slope of the land here is gentle rolling hills, covered with sparse grasses.
On the hills it is actually quite bare in appearance, as grass or bushes are separated by a few metres. M. meiacantha is not common here as only two were seen during a two hour hike. Echinocactus horizonthalonius is quite common; other plants found there were Echinocereus pectinatus v. neomexicanus (dasyacanthus) E. viridiflorus and Coryphantha vivipara v. arizonica.
Our visit to this area was in March, after a very dry winter. The plants of M. meiacantha were concave, completely pulled down into the ground like a shallow dish, being 6 inches (15 cm.) in diameter. After being potted up and watered the following summer they grew quite well.
The valley habitat between the Manzano and Los Pinos Mountains is similar to Roswell. Here the main difference is the lack of tall growing vegetation. All that is present is short, sparse grasses and
widely spaced junipers (about a half mile or one kilometre apart). Here there are the same gentle rolling hills which are also very rocky. The plants of M. meiacantha here are found out in the open being level with the soil surface. Here they are smaller, about 4 inches (10cm.) in diameter, with very rigid tubercles and spines. Other plants found here are Echinomastus intertextus and Coryphantha vivipara v. arizonica.
North east of here, about eight miles (approx. 13 Km.) in the Manzano Mountains in thick pine forest of pinon and juniper trees, is a completely different habitat. Here the slope is fairly steep, and the plants are found among the trees in deep humus-rich soil with a few rocks. The soil is covered with several inches of pine needle leaf mould. Here the plants are quite common at an estimated altitude of approximately seven thousand feet (approx. two thousand two hundred metres). The environment here provides more moisture than at the first two habitats mentioned, as winter snows are heavy and plants would be covered three or four times a year with a few inches (10-20 cm.) of snow; summer rains are more frequent
here also. Other plants in the area are Opuntia phaeacantha, 0. imbricata, Echinocereus triglochidiatus, E. coccineus, Coryphantha vivipara v. arizonica M. wrightii and Yucca baccata.
In the Sandia Mountains, near the small town of Tijeras, I have
also found M. meiacantha, the habitat here being similar to that in the Manzano Mountains. Here the plants grow on a steep east facing slope under juniper trees. In these mountain habitats the plants do not pull so deeply into the soil and an occasional almost columnar plant is found. Plant found in association are the same as in the previous case, with the addition of Echinocereus viridiflorus and the deletion of M. wrightii.
One aspect that should be mentioned about the various forms of
M. meiacantha is their tolerant nature and their adaptability. They do not mind being buried under snow in frozen icy soil or sun-baked in hard, dry soil. The rainfall at the first two mentioned sites is approximately 7-15 inches (18-38 cm.), most of it coming in a few cloudbursts in the summer.
Drying occurs very rapidly. Very occasionally light winter rains (or
rarely snow) falls, holding them until summer. The mountain habitats
are moister, with more winter snows and more frequent summer thunderstorms.
Evaporation is much less here with the trees and cooler temperatures.
Winter temperatures fall to 0°F. to 10°F. (-18°C. to -12°C.) in the mountains and to 20°F. (-6,5°C.) in the plains. Summer highs in the mountains are 80°F. to 90°F. (27°C. to 32°C.) and to 95°F. to 105°F. (35°C. to 40°C.) in the plains. Flowering usually occurs in May, followed by bright red fruits ripening from the autumn to earlier next spring. They are quite free from disease or insect damage in the wild; diseased or damaged plants are very rarely seen. It is a beautiful plant, with variations in tubercle size and firmness and spine colour. It can be recommended for growers asit is very tolerant of different conditions, very hardy, and reliable for flowers and fruits. The plants' range extends over a large area; I have
only mentioned personal sitings but plants can be found in West Texas and deep into Mexico.
Mammillaria heyderi ssp. meiacantha ML 451 san josè de la hoya , cerro el potosì, galeana, 2790m -nuevo leon - messico
In attesa di qualche fioritura che spero arrivi da Ento....
Mammillaria heyderi ssp. meiacantha SB 443 Brewster County, Texas, USA
Mammillaria heyderi ssp. meiacantha VM 419 Mexicó : Coahuila (Sierra de la Paila) Collector : Vojtech My
Mammillaria heyderi ssp. meiacantha JRT 5191 San Miguel Co. - New Mexico - USA
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