California native-plant classic gets a 21st-century makeover

Thanks to new molecular-genetic tools and intensive field research, scientists’ understanding of the native flora of the Golden State -- one of the world’s hotspots of botanical diversity -- has grown exponentially in the 18 years since publication of The Jepson Manual, the authoritative reference on California botany. New native plants have been discovered, evolutionary relationships redefined, additional species threatened or endangered by development and climate change — the list goes on.

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