For many years Sinningia richii was known in cultivation and in herbaria from collections originally made in Mexico, far outside of the expected range for the genus. This “original” form, featured above, was white with a few throat markings, and a flower and habit reminiscent of species like S. eumorpha and S. conspicua. When genetic analysis was done it turned out that it wasn’t closely related to either of these species, but rather was at the edge of the Corytholoma clade, which includes micro-miniature species like S. concinna and tall stemmed species like S. aggregata, among many widely variable others.
After that analysis was conducted additional collections were made in Brazil, adding new colors and somewhat different growth forms. A white collection from Espirito Santo State is very similar to the old Mexican form, and may be ancestral to it. A yellow collection, also from Espirito Santo State, is referred to as S. richii ‘Robson Lopes’ after the person who discovered it, and a purple form sometimes called S. richii ‘Itimaraju’ was found in Bahia State. As far as we know, none of these have been subject to molecular/genetic examination.
The purple-flowered form has a somewhat different growth and flowering habit than the others. It is indeterminate (the stems keep growing and adding leaf pairs) and the flowers are more obviously produced from leaf axils, rather than appearing as a cluster at the top of the plant.
It should be noted that all Sinningias do in fact produce flowers from leaf axils, but in some species (and some collections of S. richii) the top part of the stem and the top leaf pairs can be much reduced, and the flowers appear as a terminal cluster.
Additional photos can be seen in a slideshow by clicking one of the links below:
- An inflorescence of the white “Mexican” collection, long in cultivation
- Another blooming plant of the “Mexican” collection
- A plant with white flowers, S. richii ‘Jaguari’, growing in Espirito Santo State, Brazil
- A beautiful plant of the yellow collection, S. richii ‘Robson Lopes’
- A close view of the flower on ‘Robson Lopes’
- A plant of ‘Robson Lopes’ growing in Espirito Santo State, Brazil
- Sinningia richii ‘Purple’ (sometimes called ‘Itimaraju’) growing in Bahia State Brazil; note that the flowers are more obviously emerging from below the top leaf pair
An excellent overview of this species can be seen on the website “Sinningia and Friends”.