'Butterfly Lip' or 'Big Lip' phalaenopsis, shown here in purple, features a wider lower lip instead of the traditional tubular lip. In the background are pansy orchids. Both varieties are featured on the Arches display at the NYBG Orchid Show. Traditional phalaenopsis feature a closed, tubular lip. BRONX, N.Y. — Among the dancing ladies, rainbows, canes and corsages at the New York Botanical Garden's 17th annual Orchid Show, keep an eye out for 'Butterfly Lip' phalaenopsis. Also referred to…