This small-flowered plant is one of the few yellow species, and the source of much of the yellow color in hybrids.
Other photos can be seen in a slideshow by clicking one of the links below:
- The small population of plants that included the flower in the photo above, in Michoacan State, Mexico,
- A flower on a plant in cultivation at the Smithsonian Institution research greenhouses, near Washington, DC, USA
- A cluster of flowers in cultivation, possibly an earlier instance at the Smithsonian Institution greenhouses