Published in Särtyk ur Meddelanden från Göteborgs Botaniska Trädgård (Acta Horti Gothoburgensis) 1:151-152. 1924.

         The type description of Oreorchis nana by Schlechter, based on specimens collected by Harry Smith in the Huanglong valley on July 21, 1922 and that of O. oligantha Schlechter, 1924, also based on specimens collected by H. Smith in Huanglong valley on July 23, 1922, are rather confusing. Schlechter mixed characters of O. nana with those of O. oligantha and vice versa, which subsequently let to many misidentifications by later authors. Finally the revision of the genus Oreorchis Lindley, 1859, by Nicholas R. Pearce and Philip J. Cribb (1997) cleared the matter, based on investigations of type material of both species. O. nana looks very much like a small version of O.erythrochrysea Handel-Mazzetti, 1925, with a shorter leave and has not much in common with O. oligantha. The leaf of O. nana is about the same size as that of O. oligantha but is usually much wider. It is a relatively common species in the Minshan. It sometimes forms dense populations in the Huanglong and neighboring valleys at altitudes from 2900-3400m. The inflorescence of O. nana reaches 15-20cm in height and carries 7-15 flowers with a diameter of about 7mm, the leaf is 3-4cm long and 1.5-3cm wide.

         Flowering: June.

        鲁道夫•施勒希特对典型硬叶山兰形态描述所依据的标本是哈里•史密斯1922年7月21日在黄龙沟采集的， 而少花山兰O. oligantha Schlechter, 1924形态特征的描述所依照的标本是哈里•思密斯1922年7月23日在黄龙沟所采集的。有关这两种山兰花形态特征的记述都很模糊。鲁道夫•施勒希特将这两种山兰混淆在一起，使得后来一些学者在鉴定时也发生错误。直到1997年尼古拉斯•皮尔思和菲利普•克里珀对这两种山兰的模式标本产地进行实地调查后，才澄清了这个问题。硬叶山兰看起来更像短梗山兰O. erythrochrysea Handel-Mazzetti,1925，而不是少花山兰，但它的叶片较短，这与短梗山兰不同。硬叶山兰与少花山兰的叶片大小差不多，但叶片更宽一些。硬叶山兰广泛分布于四川岷山，在黄龙沟及其相邻溪谷它通常会形成比较大的居群。硬叶山兰为总状花序，花序长15-20厘米，通常具7-15朵花，花直径约7毫米，叶片长3-4厘米，宽1.5-3厘米。

        花期：6月。