Cephalanthera longifolia (L.) Fritsch [ Cephalanthera ensifolia Rich.]
      
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6 222356 Cephalanthera longifolia (L.) Fritsch [125 939972 Serapias longifolia L.] Orchidaceae
Ann. Roy. Bot. Gard. (Calcutta), vol. 8(3): : t. 362 (1891) [R. Pantling]