Du, R. 1931: The Long-tubed New Zealand Species of Euphrasia (= Siphonidium Armstr.). Svensk Botanisk Tidskrift 25: 108–125.
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Du, R. 1931: The Long-tubed New Zealand Species of Euphrasia (= Siphonidium Armstr.). Svensk Botanisk Tidskrift 25: 108–125.
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