Mammillaria grahamii

From Mammillaria of the mounth by Chris Davies …..
http://www.cactus-mall.com/mammsoc/motms.htm

Mammillaria grahamii is one of the more widespread Mammillarias from the Southern Unites States and Northern Mexico, ranging from Texas to Arizona. The equally well known name of Mammillaria microcarpa is now taken to be a synonym of this species, and the sometimes referenced variety oliviae also now subsumed into a single, and quite variable species.

As is often the case with widely distributed species, a number of species and varietal names have been associated with this plant over the years, including milleri, which at one time seemed destined to become the species name for microcarpa. However with the combination of microcarpa and grahamii, a single species name has won out.

It is usually a cylindrical, offsetting or branching plant, with a variable number of radialspines, ranging from 18 to 30+, which are usually white, but can be seen with pale brown or even red tinges to them. The central spines are also variable in number, from 1 to 4 tyically, and in colour, from yellow to brown to almost black. The flowers are it's crowing glory, pink to lavender, often appearing as a complete ring, with their greenish-yellow stigmas stretched beyond the level of the petals.






Plant in habitat - Southern Arizona: Copyright of Chris Davies 2009






Plant in habitat - Southern Arizona: Copyright of Chris Davies 2009

Mammillaria grahamii Engelmann, Proc. Amer. Acad. 3: 262 (1856)
Plants solitary or branching basally. Stems globose to short cylindrical, light green, 7/20 cm (2.8/7.9 in) or more high, 7.5/11 cm (3/4.3 in) in diameter.
Tubercule: Ovoid to cylindrical, often four-angled.
Axils: Naked.
Radial spine: 20 – 35, straight, needle-like, white to light brown to reddish, 6 – 12 mm (0.2 – 0.5 in) long, lateral ones longuest.
Central spine: 1 – 4, yellowish brown to dark brown, 12 – 25 mm (0.5 – 1 in) long, the longest one usually hooked.
Flowers: Pink to lavender pink to reddish purple, sometimes white, 20 – 45 mm in diameter.
Fruit: Bright red, 12 – 25 mm (0.5 – 1 in) long.
Seed: Black.
Geographic Distribution: California, Arizona, New Mexico and Texas, USA; Sonora, Sinaloa and Chihuahua, Mexico. Altitude 200 /1550m




Mammillaria grahamii SB 507
SB 507 - Dona Ana Co. - New Mexico - U.S.A.

Mammillaria grahamii SB 70
SB 70 - Luna County - New Mexico - U.S.A.

Mammillaria grahamii SB 218
SB 218 - Samalayuca - Chihuahua - Mexico

Mammillaria grahamii SB 154
SB 154 - Agua Prieta - Sonora - Mexico

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Mammillaria grahamii SB 1860
SB 1860 - Steins - New Mexico - U.S.A.

Mammillaria grahamii JM 183
JM 183 - Collector Josef Mikulas - Caballo Mountains - Texas - U.S.A.

Mammillaria grahamii DJF 1000
DJF 1000 - Rincon mountais, Pima Co - Arizona - U.S.A.
From Chris Davies collection - Chinnor - U.K.

Mammillaria oliviae, Arizona, west of Vail near Tucson,
Body - Single or branching, globular to short, cylindrical, up to 10 cm, tall, tubercles ovoid axils bare
Radials 25-36, snow white or reddish brown, stiff, thin, 6 mm. long, upper ones shorter
Centrals 1-3, lower ones ascending stiff, white or chocolate-brown, subulate later occasionally hooked.
Flowers - About 3cm.wide, petals lanceolate pointed, magenta-coloured, outer margin and tips white, filaments deep magenta, style light rose,
stigma oliva green.
Fruit scarlet, clavate, up to 2.5 cm. long, seed black.
From "The Journal of the Mammillaria Society" Vol. VIII n. 1 - February 1968





Mammillaria grahamii v. oliviae  SB 371
SB 371 - Hidalgo Co. - New Mexico - U.S.A.

Mammillaria grahamii v. oliviae SB 158
SB 158 - Nacozari - Sonora - Mexico
From "Gianca" collection - Firenze

Mammillaria grahamii v. oliviae REP 1784
REP 1784 - Cochise Co., Dos Cabezas Mts. - Arizona - U.S.A.
From "Ento" Ennio Toso collection - Savona










Mammillaria grahamii v. oliviae REP 1784
REP 1784 - Cochise Co., Dos Cabezas Mts. - Arizona - U.S.A.

Mammillaria grahamii v. oliviae
no data
Dedicated to Olivia Orcutt the wife of C.R. Orcutt, dealer of cacti in XIX century