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

Coryphantha erecta

Coryphantha erecta was described about 150 years ago, but generally neglected by cactus collectors. It is a somewhat trivial looking plant, with very pretty summer blooms.

Copiapoa laui

The smallest of all Copiapoas, with tiny button-head stems, is underground plant in the nature. Stems are usually flat to the ground, and really hard to find when not in bloom. In culture they form small multi-headed clumps.

Mammillaria grahamii

Mammillaria grahamii is a common plant of southern and central Arizona. There are several different forms of this plant found throughout the state. This form with tight white radial spines covering the steam and striped flower comes from Organ Pipe Cactus National Park.