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18 October 2007 Pentachaeta aurea Subsp. Allenii (Asteraceae), a New Subspecies from Orange County, California
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Abstract

Pentachaeta aurea Nutt. subsp. allenii Keil is described as new. It is apparently endemic to southwestern Orange Co., California. Lamina tips of ray corollas of living specimens of the plants are pale yellow in early morning but turn brilliant white after 1–2 hr in sunshine; laminae of subsp. aurea are solid yellow.

David J. Keil "Pentachaeta aurea Subsp. Allenii (Asteraceae), a New Subspecies from Orange County, California," Madroño 54(4), 343-344, (18 October 2007). https://doi.org/10.3120/0024-9637(2007)54[343:PASAAA]2.0.CO;2
Published: 18 October 2007
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