Yes, 'way out west here, in southern Alberta and a few particularly hot, dry parts of British Columbia, live some small wild cacti, which can surprise unwary hikers with their sharp spines. These photos were taken yesterday by my husband, Richard Schear, in the coulee not far from our house.
The cacti with the yellow flowers are Prickly Pear Cactus, he says, while ones the with pink flowers he described as Escobaria Vivipara.
In the first photo we see a prickly pear with a fully open blossom, and with one unopened brown bud below it. See the brown buds again in the photo below.
Below are some Escobaria
in bloom, but I rather like this photo of unblooming cacti, despite the fact that they are the most likely to surprise an unwary walker in the coulee. They have sharp spines and will attach themselves to a hiker's clothing.