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Great Plains ladies'-tresses flowers are arranged in three rows spiraling up around the stem. The petals and sepals are both white with a tinge of yellow on the lower lip (lower petal). The two petals are top and bottom of the bloom, with the lower, ruffled petal extending out and down; the two sepals are narrower than the petals and flank the side of the bloom, sometimes arching higher than the petals. Typically, there is a single stamen; the style is fused to the surface of the lower petal deep in the flower. The base of the flower is nestled between oval green bracts which cup the ovary and taper to a sharp point above the flower. Great Plains ladies'-tresses are probably pollinated by bumblebees, but information is sparse. If you get down on your hands and knees (or, better, lie down beside the plant) and put your nose up against the blooms, it is really true that they smell like vanilla(!). A closely related species, nodding ladies'-tresses (Spiranthes cernua) was once considered to be the same species as Great Plains ladies tresses, but the former still has its basal leaves on blooming and no scent while the latter never has the basal leaves when blooming and the flowers smell like vanilla.

Spiranthes

Spiranthes magnicamporum

Great Plains ladies'-tresses [Blooms: Sep]