This endangered species of cactus from Brazil lacks a common name. Parodia warasii is native only to Brazil’s southernmost state, Rio Grande do Sul, where it grows in the cracks of rock walls at four different locations.
Dangers to the populations at these four locations–all at elevations between 800-1000m (2600-3300 ft.)–include landslides, extreme sports (rappelling), and potential construction of dams. The generally difficult-to-access locations at least protect them from overcollection. The plants bear yellow flowers that cover the top of the stem when in bloom (though some resources also include white-flowered plants).
The plant in today’s photograph is from Huntington Botanical Gardens in southern California, which is on my mind because several of my colleagues are presently in the area attending this year’s American Public Gardens Association conference. In fact, this photo was taken when I attended the conference there ten years ago. Perhaps one of them will run into this plant (well, not literally) and provide an update!