The plant is part of Magnolia Gardens (wholesaler/grower) Plants For Texas® program, plants that do well all over Texas. I've had it at least 5 years and it's never received a cultivar name. And it certainly isn't a new selection as Mr Lowrey died in 1997 and collected it probably in the 70s-80s.
Another Lowrey collected plant at the arboretum, a dwarf Scutellaria suffrutescens, is sold by Magnolia gardens as common name Pink Texas Skullcap, but was given an unregistered working name as 'Texas Rose' and is sold by Plant Delights as such.
Both Yucca Do and Plant Delights sell selections collected in the wild without giving them cultivar names. For instance, I had Trismeria trifoliata Collection #A1AG-103.
If these plants are sold by local and online retailers across chunks of the country, why wouldn't they be in the database?!
Here's a possibility for working with these plants following how the Rose Rustlers handle unidentified roses. Now the system automatically adds the single apostophes to cultivar names. If someone entered a plant in the cultivar field with double quotes, could the system just leave it that way?
I'd enter Hamelia patens "Lynn Lowrey Selection at SFA Mast Arboretum", Common Name: Compact Texas Firebush. It would show up in the header with the double quotes.
Is that feasible?