Matucana madisonorum

This is a more common Matucana, usually known as a naked ball with eventual spine or two. When grown on strong light, they actually develop long brown spines, somewhat twisted.

Mammillaria schiedeana 'plumosa'

The close-up of spines of Mammillaria schiedeana 'plumosa' shows that actually the spines are not 'feathery' like M. plumosa's. Each spine turns into fin hair-like stricture, giving the plant the overall 'puffy' look.

Rebutia fiebrisii

Many day-flowering cacti close buds for the night, protecting the precious pollen from the night moisture. Here is Rebutia at dusk, ready for the night.

Maticana paucicostata

This is truly the smallest of Maticana species, and the slowest. Vivid red flowers are produced repeatedly over the summer.

Denmosa rhodacantha

Denmosa is a South American genus with single variable species. These are mountain plants, becoming tall barrels with age. They also have a very curious-looking flower adapted for humming bird pollination.

Coryphantha sulcata

The young C. sulcata plant, blooming for the second year. The specific name - 'silky' - refers to the white flock that is produced already and with age will cover all the upper part of the plant.

Echinocereus websterianus

Echinocereus websterianus is endemic to a single island in California Gulf, similarly to E. grandis - closely related species found on three other island in the gulf. Administratively the birthplace of E. webstarianus belongs to Sonora state, but I consider it to be one of Baja California species, based more on ecological than administrative divide.