凹脉 concave veins
- 营养枝具叶2-4枚;叶鞘长2-10厘米,边缘膜质,叶耳钝圆;叶片长5-35厘米,宽1-2毫米,先端钝或微凹;初级脉3条,平行。
Vegetative branches with 2-4 leaves; sheath 2-10 cm long, margin membranous, auricle obtuse; leaf blade 5-35 cm long, 1-2 mm wide, apex obtuse or slightly emarginated; primary veins 3, parallel.
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