Helia Bravo Hollis

Lophophora diffusa, commonly known as false peyote, is a species of plant in the family Cactaceae and one of the species in the Lophophora genus. It is endemic to Mexico in the outskirts of Querétaro. This species contains only trace amounts of the psychedelic alkaloid mescaline. Instead, the sedative pellotine is the principal alkaloid. The species name diffusa refers to the flat tubercles that are outspread without the plant having prominent ribs.

Mammillaria matudae, commonly known as the thumb cactus, is a species of cactus from Mexico. It was named after the botanist Eizi Matuda. Mammillaria matudae is a succulent subshrub. It grows either solitarily or in clusters from its base. Its cylindrical stems are slender, reaching 10–20 cm in height and about 3 cm in diameter, and have a sprawling or creeping habit. A variety, described as var. serpentiformis but no longer separately recognized, can grow up to a meter long and 7 cm wide. The axils are smooth and bare. It features 18–20 delicate, translucent white radial spines, each just

Ferocactus lindsayi is a species of Ferocactus found in Mexico.

Cephalocereus mezcalaensis is a species of Cephalocereus from Mexico.

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Opuntia huajuapensis, commonly known as the Huajuapan prickly pear or the Chumbera, is a species of prickly pear cactus in the family Cactaceae. It was described by Helia Bravo Hollis in 1953, and named for the town of Heroica Ciudad Huajuapan de León in Oaxaca, Mexico, from which the first specimens were described.

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Ferocactus haematacanthus is a species of Ferocactus from Mexico.

Mammillaria perezdelarosae is a species of cactus – a member of the family Cactaceae, placed in the tribe Cacteae. This cactus is common. It blooms with light pink and white flowers and is native to Jalisco, Mexico.

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Stenocereus chacalapensis is a species of cactus in the genus Stenocereus, endemic to Mexico.

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