Pieter Burggraaf notes:
The two photos from Altman Growing Grounds could be somewhat confusing in identifying O. aciculata encountered in the wild or in gardens maintained with little supplemental water. The Altman Growing Grounds photos show plants with an abundance of longer spines; this may be due to excessive watering (as would occur at a plant nursery) or perhaps natural hybridization of aciculata with another species. In addition, the Altman photo of the bloom of aciculata is almost too orange, too bright, which could be, again, an indication of hybridization (or simply a color variation due to digital photography). Anderson's "The Cactus Family" states that the bloom color for O. aciculata is yellow, but it is my experience that the bloom is a dull or faded red (tomato red) in the mornings, fading to a dull pink by late afternoon. Perhaps this is a typo in Anderson or perhaps I have just not seen the yellow variation yet?
-Pieter Burggraaf
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