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Pflanzenreich wolf umbelliferae
(Wilhelm Engelmann, 1927)
Pflanzenreich perkins monimiaceae
(Wilhelm Engelmann, 1911)
HISTORY OF BOTANY (1530— 1860)
(Clarendon press, 1906)
Pflanzenreich schulz cruciferae part araceae
(Wilhelm Engelmann, 1919)