Bonjour
I do not recognize on these photos neither vulgaris nor grandiflora .
can you take 3 corolla picture : profile to see the spur ; the throat to see it drawing , the sepal
It would be very interesting to have a more extensive study of this plant
when I see your picture , I rather think about a South American species ,Can be an acclimated species or a horticultural hybrid , or a new species ?
She is alone on this site ?
if you have seeds , I am taker.
see here a real grandiflora subsp grandiflora to 'morphologie' or ' photos in /ex situ' :
http://fern72.free.fr/siteweb/donnees-monographie/gragra.htmlsee in particular the spur and the drawing on the throat
jeff