Spiranthes magnicamporum Vs. Spiranthes cernua

I was delighted by how well received the comparison between the purple fringed orchids was and decided to make more illustrations for identification purposes. As requested, I will be focused mainly on Spiranthes for the time being. S. magnicamporum was considered the same species as S. cernua up until 1973. It can often be distinguished from S. cernua by the flared lateral sepals, the lack of basal leaves, the yellow thickened area on the labellum and by the shape of the flowers. S. cernua will often have a white labellum and basal leaves should be present while in flower. However, morphological differences can often be misleading since S. cernua is a species complex, and will occasionally exhibit traits from S. magnicamporum . Perhaps the best way to distinguish between the two is to examine the seeds, which are often polyembryonic on S. cernua, unlike those produced by S. magnicamporum

@sambiology and @eraskin, it is done! I will continue to make other illustrations throughout the year. Hope this is helpful.

<img src="https://johngangenexus.files.wordpress.com/2017/10/img_2973.jpg?w=525"

Posted on 20 October, 2017 00:55 by arethusa arethusa



Hopefully @gcwarbler will look at this too — great journal entry! :)

Posted by sambiology over 6 years ago

Excellent! Looking forward to more. I'll have to make myself a little pocket-reference with these. Thanks.

Posted by eraskin over 6 years ago

Great! I should add a new one sometime this month.

Posted by arethusa over 6 years ago

I have added links to this post from both taxon pages.

Posted by eraskin about 5 years ago

When I lived in Dallas, I had Spiranthes sp. in my front lawn. I remember determining that they were S. magnicarporum, but I don't recall how I made that determination. One difficulty with them was that the flowers never opened. That was in the 1980s in Pleasant Grove.

Posted by victorengel over 4 years ago

Add a Comment

Sign In or Sign Up to add comments