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among large rhyolite boulders cresting steep volcanic flowstone hill just above Rio Grande River with Buddleia marrubifolia, Tecoma stans, Yucca thompsoniana, Perityle parryi, Streptanthus carinatus. SYN: Perezia runcinata
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hillside slope with calcareous gravels on over white blocky limestone outcrops. An exceptionally rich and diverse site less than 100 yards east of Coahuila state line.
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rocky rhyolite hillside drainage
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foliage, plant in open rocky rhyolite hillside drainage
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in seed, plant on open grassy slope of rhyolite rubble below roadside
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among large rhyolite boulders cresting steep volcanic flowstone hill just above Rio Grande River with Buddleia marrubifolia, Tecoma stans, Yucca thompsoniana, Perityle parryi, Streptanthus carinatus. SYN: Perezia runcinata
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steep south facing canyon wall in rhyolitic tuff gravels
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perennial on calcareous alluvium along drainage between low limestone ridges.
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