Helleborine and Stream orchid

Helleborine noun - Any of several small temperate and tropical orchids having mottled or striped leaves and spikes of small yellowish-white flowers in a twisted raceme.

Stream orchid and helleborine are semantically related. In some cases you can replace phrase "Stream orchid" with "Helleborine", this terms are similar.

Stream orchid noun - Orchid growing along streams or ponds of western North America having leafy stems and 1 greenish-brown and pinkish flower in the axil of each upper leaf.

Helleborine and stream orchid are semantically related. You can use "Helleborine" instead a noun phrase "Stream orchid".