This is the cycle of the Moonflower, a kind of Morning Glory. Night bloomers are really special flowers. They take advantage of all the light of the day to grow but don’t compete for the daytime pollinators. Instead they attract night moths such as the hawkmoth.
I love a mystery, and in looking around for information on this beauty I found a confusing array of both common and Latin names. Numerous Moonflowers are out there. Mine turned out to be currently and probably definitely named Ipomoea alba . But take a look at the synonyms I found:
Synonym:Calonyction album
Synonym:Calonyction aculeatum
Synonym:Calonyction bona-nox
Synonym:Ipomoea noctiflora
Synonym:Calonyction pulcherrimum
This is the kind of thing that gives people headaches. What is it really called? Why the confusion of names? Where is a definitive source for this pretty puzzle? In addition to a mystery I love to ferret around looking for odd things, and this expedition turned out to be easier than I though. The USDA has a plant taxonomy (names and classification) data base called GRIN which stands for Germplasm Resources Information Network. Using DNA analysis and a classification method called Cladistics, the exact relationships of one living thing to another can be assessed. Voila! The statement below is the definitive position of my mysterious plant:
“Though formerly classified as genus Calonyction, species aculeatum, it is now properly assigned to genus Ipomoea, subgenus Quamoclit, section Calonyction.” (1) and my species is alba .
A beauty by any name is still a beauty, and this is one for sure. And, as a bonus, as are most moth pollinated flowers, it is wonderfully fragrant.
1. http://www.ars-grin.gov/cgi-bin/npgs/html/taxon.pl?20135