來自北越的新屬與新種——裂唇早田蘭（蘭科）

Hayata glandulifera (Orchidaceae), New Genus and Species From Northern Vietnam

來自北越中部低山區的新屬早田蘭與己知的指柱蘭、斑葉蘭、Rhomboda與線柱蘭有密切關係。早田蘭與斑葉蘭屬不同在它具有二個分離的側面柱頭，唇瓣基部內無毛，具有大塊結狀的唇瓣中段與先段形成二片具有裂齒。它與指柱蘭之不同在有甚大的花朵而且花瓣分離，唇瓣基部內側壁上具有腺体，地下莖不具有膨大的節間，與地下莖並沒有被覆根毛。與Rhomboda屬之不同在新屬唇瓣上不具任何龍骨，唇瓣基部具有內側腺体，蕊柱不具有翅狀附屬物。新屬與線柱蘭屬非常相近，但新屬之外形，大的花朵，裂唇與蕊柱先端之附屬物均可與之區別。除了越南的產地外，新屬尚有分佈於台灣之裂唇早田蘭與分佈於布丹的H. sherriffii。本文內尚介紹了新屬之分類處理與檢索表。

New orchid related to Cheirostylis, Goodyera, Rhomboda and Zeuxine discovered in lowland central part of northern Vietnam is described in rank of separate genus Hayata. Proposed genus differs from Goodyera in 2 separate lateral stigmas; in not hairy hypochile; in massive, knob-like mesochile and in large 2-lobed, dentate epichile. It differs from Cheirostylis in large flowers with completely free sepals (newer forming tube); in peculiar bunches of capitate glands on lateral walls of hypochile and in not swollen succulent rhizome forming normal adventitious roots, not modified into ridges or pillows covered by root hairs. From Rhomboda discovered genus differs in absence of any keels on the lip; in specific papillae bunches inside hypochile and in not winged column. New genus may be also close to Zeuxine, from which it differs in plant habit, large flowers, large dentate lobes of epichile and in specific shape of stelidia and rostellar arms. Described plant not fits well with any genera of subtribe Goodyerinae and certainly desires generic segregation. Besides Vietnamese plant, described genus includes H. tabiyahanensis from Taiwan and H. sherriffii from Bhutan. Standard taxonomical treatment of new genus and key for its species identification is presented in the paper.