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I crossed S. douglasii with S. leucotricha in 2004. This was hardly the first time this cross had been done -- see the crossing chart). The first flower appeared in May 2007 (neither parent species is quick to bloom from seed). The parents are two of my favorite species, so I was curious to see what the result of crossing them would be. The hybrid could be a stepping stone to a nice combination, and I've harvested F2 seed from this plant. (I also note that Mauro Peixoto's Brazil Plants club offers leucotricha x douglasii F2 seed.)
The flower resembles that of S. douglasii, but is just a little smaller. At this stage, certainly, the plant is nowhere near as floriferous as S. douglasii.
The foliage is intermediate between the two parents. The leaf is definitely hairy, but the hairs are not as conspicuous as those of S. leucotricha.
Vincent Parsons, on Gesneriphiles, has said that he made crosses with S. leucotricha, and even back-crosses to it, without recovering the full leucotricha foliage.
The leafbacks look a lot like S. douglasii, with the dark red petiole and midrib.