识别要点：大围山杓兰与原变种的不同在于中萼片黄绿色疏生紫红色斑点;花瓣仅稍长 于唇瓣;唇瓣囊口有一黑色圈。
形态特征：A terrestrial herb with a stout rhizome bearing many long roots.Stem 5-8cm longbifoliate at apex.Leaves appressed to substratesuborbicular15-17cm long1-14cm widegrayish-green heavily spotted with purple-brown.Inflorescence one-floweredebracteate;flower large;dorsal sepals pale yellow-greensparsely spotted with purple-red;synsepal yellowish tinged with grayish-greensparsely spotted with purple-red;petals and lip yellowish densely spotted with purple-red;lip with a black circle around the mouth;staminode yellowish densely spotted with purple-rednarrowly white-margined;dorsal sepal ovate or suborbicular4-5cm long3∙5-4cm widecili- ateglabrous;synsepal lanceolate4-5cm long1∙5-1∙8cm wide;petals curved forwardsembracing the lip elliptic4∙2-4∙7cm long3-3∙5cm wideciliate on apical marginspubescent on upper side of abaxial surface; lipsubglobose3∙8-4∙5cm long3-3∙5cm widemore or less papillate on front surface;staminode tongue- shaped1∙7-2cm longca.0∙5cm widepuberulous adaxially.
