Field of Science

Friday Fabulous Flower - pretty tiny

Today's FFF is perhaps one of the rarest plants in our gardens.  It probably isn't all that uncommon, but it still is rarely seen, and so it seems rare.  The other interesting thing is that this is a total volunteer plant, all on its own, it found its way into our garden and found a fairly protected site under our star Magnolia.  Generally plants don't like growing under this Magnolia because its roots are very shallow and so it can compete strongly for water and nutrients.  But when you are such a small plant it doesn't take much in the way of resources for you to grow.  The whole plant is only about 6-8" tall, and each individual flower is only about 4mm long.  The flowers are spirally arranged on the spike and so the scientific name Spiranthes seems most appropriate.  TPP is no certain but this seems to be S. cernua (nodding ladies' tresses).  This also points out that small inconspicuous plants are often considered rare.  This little orchid is in flower now, in early October, and TPP thinks there are two little seedlings growing nearby.



3 comments:

Roger Latour said...

I'm not sure of the identity of that Spiranthes, I'm rusty in my orchid studies. But these flowers are peloric and cleistogamous (inflated ovary all the way to the top). Principal author of this article has introduced a lot of changes on the genus taxonomy. I never found time to seriously look into it. Maybe you will find it useful:


https://bioone.org/journals/systematic-botany/volume-42/issue-4/036364417X696537/The-Systematics-of-the-Spiranthes-cernua-Species-Complex-Orchidaceae/10.1600/036364417X696537.full

The Phytophactor said...

Peloric! That's a surprise, guess I'll have to take a flower to campus and have a close look under a dissecting scope. Well, I know nothing of the taxonomy and was relying on a field guide to Illinois plants. Many thanks for the information. I'm getting too old for flowers that small!

Roger Latour said...

Please share your dissection report! I had always found identifying plants of this genus, specifically the "compilospecies" S. cernua... a risky task. Latest literature doesn't really help... but age is probably a factor...