北美洲的一种兰花，叶单生，花具有丝状反析花瓣。
North American orchid having a solitary leaf and flowers with threadlike petals.
有稀少似羊毛的绒毛层的小枝；叶背面脉具白色的毛和具具稀疏蛛丝状毛。
Branchlets with sparse woolly tomentum; abaxial veins of leaves with white hairs and with sparse arachnoid tomentum.
全部相似的叶，通常沉水的，具丝状的裂片。
Leaves all similar, usually submerged, with filiform segments.
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