Mammillaria beiselii

Echinocereus pulchellus

Mammillaria conspicua

Mammillaria conspicua is a form of Mammillaria haageana, and with age it should develop lots of white wool under the spines. The young seedlings I gave do not show it yet, but they look pretty anyways.

Matucana haynei

The pink-flowering variance of this variable species - nice addition to any cacti collection.

Oreocereus doelzianus ssp. sericatus

AKA Moravetzia sericata, a slender Oreocereus, easiest to flower in collection. The flower comes at the tip of the stem.

Mammillaria petrophila

This modest Mammillaria is Baja California endemic, and older plants can be densely wrapped with white 'wool' formed in axilles. This plant just started to develop some of it.

Austrocylindropuntia shaferi

Two years old from seeds plant flowering in by backyard. This is a very vigorous plant, and at that young age produced unexpected flowers. The first flowers are small, but the color is striking.
The same plant 2 years back: http://cactusaficionado.blogspot.com/2012/04/austrocylindropuntia-shaferi.html