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Genus Arethusa
- genus of bog orchids of North America and Japan
Genus Bletia
- genus of tropical American terrestrial orchids with large purple or pink flowers
Genus Bletilla
- small genus of chiefly east Asiatic hardy terrestrial orchids similar to genus Bletia
Genus Brassavola
- genus of tropical American epiphytic or lithophytic rhizomatous orchids
Genus Brassia
- genus of tropical American epiphytic orchids having striking axillary racemes of yellow to green spiderlike flowers with long slender sepals and warty lips: spider orchids
Genus Caladenia
- terrestrial orchids of Australia to New Caledonia
Genus Calanthe
- large and widely distributed genus of terrestrial orchids
Genus Calopogon
- terrestrial orchids of North America
Genus Calypso
- 1 species found throughout much of northern North America and Eurasia
Genus Catasetum
- genus of tropical American orchids having showy male and female flowers usually on separate inflorescences