Machaerocereus

This genus

Machaerocereus eruca -

Reported to contain unspecified alkaloids.

Machaerocereus gummosus -

Reported to contain unspecified alkaloids.

Mammilaria

A large Genus of over 200 species, sacred to the Tarahumara, who use them as ritual entheogens. Plants characterized by many long, white spines and conical tubercles. Young plants form a cluster around the parent plant. Considered one of the more important species of false Peyote. The intoxication produced by several cacti of this species is followed by a deep sleep in which brilliant visuals are produced, during which time it is said a person can travel great distances. It appears that the fruit of most Mammilaria contain the same alkaloids as the parent plant. Most species are rich in a thick, latex sap. This Genus is named after the Latin word "mamilla" for breasts, because of the shape of the plants tubercles.

Mammillaria arizonica -

Can also be classified as Mammilaria grahamii. Native to Arizona, New Mexico and Eastern Texas.

Reported to contain unspecified alkaloids.

Mammillaria applanata -

Can also be classified as Mammilaria heyderi. Native from Northern Mexico to Texas and New Mexico where it is common and widespread.

Contains: N-methyl-3,4-dimethoxyphenethylamine.

Mammillaria craigii - Mammillaria grahamii - Mammillaria heyderi - Mammillaria longimamma -

Mammillaria macromersis -

( Mulato ) The Tarahumares use this as one of their Peyote substitutes. Its use is claimed to prolong life, give great speed to runners, and help clarify vision to allow spiritual thoughts. Some question as to the true classification of this plant.

Reported to contain unspecified alkaloids.

Mammillaria magnimamma - Mammillaria meiacantha -

Mammillaria microcarpa -

Native to western Texas to the northern Mexican deserts. A small plant to 16 cm, with a conical growth habit. Small conical tubercles with no hair or bristles topped by an areole which is covered in numerous radial spines. Bears multiple pinkish-purple flowers. Can also be classified as Mammilaria millerii.

Contains: 3,4-dimethoxyphenethylamine, hordenine, tyramine, N-methyltyramine.

Mammillaria pectinifera -

This cactus grows as small globes covered with white comb-like spines. Native to the State of Puebla, near Tehuacan, Mexico.

Reported to contain unspecified alkaloids.

Mammillaria senilis - A small, round Cactus with a slightly elongated stem, covered in long, white hairs. Native to Mexico, from the Chihuahua desert through the Sierra Madres, and South to Jalisco. Once classified as Mamilopsis senilis.

Reported to contain unspecified alkaloids.

Mammillaria vivipara -

This species can also be classified as Coryphantha vivipara.

Reported to contain unspecified alkaloids.

Melocactus

Melocactus delessertianus -

Contains: tyramine.

Melocactus maxonii -

Contains: 3-4-dimethoxyphenethylamine, 4-hydroxy-3-5-dimethoxyphenethylamine, tyramine.

Monvillea

Monvillea spegazzinii -

Native to Paraquay and northeast Argentina. Characterised by many basal shoots and erect stems to 2 meters tall. Stems are an irridescent bluish-green, with usually four raised angular ribs. Areoles reside in deep recesses in the ribs, with 3 to 5 dark spines. Nocturnal flowers are red outside and white centers, borne laterally.

Needs semi-shade and to be kept above 50 degrees F. Fast growing.

Reported to contain unspecified alkaloids.

Myrtillocactus

Myrtillocactus geometrizans -