Echinocereus engelmannii

The very unusual blooms on this plant drew my attention. The 'petals' are very short, making it look like peony flower.

Echinocereus triglochidiatus gonacanthus

Dramatic plants at White Sands NM - also known as 'White Sands form', despite been common all the way North to Albuquerque. The thick-stemmed plants are about two feet tall, and at the time of my visit were about to burst with blooms.

Pediocactus bradyi

This photograph was taken in Marble Canyon, at one of the better known locations of this tiny cactus. The crack-open seed pod is full of large seeds, about the same size as Astrophytum seeds.
The small plants look very similar to juvenile Pediocactus simpsony plants, neat and tidy.

Echinomastus intertextus

Echinomastus intertextus near Tucson AZ. Note the petals that were eaten by some rodent (rabbit?)

Pediocactus paradinei

This Pediocactus species occurs on limited area of Kaibab plateau, but locally common. Most often the plants are growing under and inside the small bushes and are very hard to spot. 

Mammillaria heyderi

Mammillaria heyderi grows near Douglas, AZ, on volcanic soil. The plants in this area are very flat, most often level with the ground, unless found in shady area. This is a good example of a natural look to be desired for this species in horticulture.

Echinocereus coccineus

This is a common species of the American South-West, also known as Claret Cap cactus. This long-spinned form is common at higher elevations in the area from Zion National Park to Kaibab Plateau, were it sometimes called E. toroweapensis. At even higher elevation this species is replaced by somewhat similarly looking Eastern form of E. mojavensis.