Image © 2006 Owen Davies
Passiflora racemosa. In about 2002 Mark Cooper kindly sent me some wild collected seed (from Brazil?) from an unidentified red flowered Passiflora. Only a few seed came up and all appeared to be P. tarminiana. I did think it odd though as P. tarminiana is pink. I gave one very young seedling to Owen Davies believing it to be P. tarminiana.
I thought no more about it till in 2006 Owen tried to describe the flowers as red and how they were growing in an odd manner. I didn't believe him to be honest & asked him to take some pictures. The P. tarminiana was in fact Passiflora racemosa Clone 1 above!
Passiflora racemosa is a very variable species. It is a stunning plant which unusually for a passion flower produces racemes (chains of flowers with no leaves) with up to 30 flowers on them. Sometimes there are two flower buds at one joint so technically they may be pseudoracemes? Killip comments that leaves can be three lobed or entire with the colour of the flower varying from red to white. Also the series of three corona filaments are variably banded and coloured from white to predominantly reddish/purple.
Dr Les King in June 2007 observed the stamens on many P. racemosa clones are distributed asymmetrically in a similar but less exaggerated manner compared with bat pollinated Passiflora flowers such as that of P. mucronata. This and the slightly curved androgynophore (stalk in the middle of the flower) encourage entry to the flower from one side by pollinators which will get dusted with more pollen that if the flower was symmetrical. Interestingly P. pinnistipula shows the curved androgynophore but the anthers still appear symmetrical.