Yellow Raspberry / Black Raspberry
My father has had these berries growing wild at his place for the last 30 years or so. We've always called them black-caps and yellow-caps. The black ones you see growing wild everywhere along fence lines or the edge of a bush. But the yellow ones I've never seen other than this patch on his property.
The plants are identical in terms of the thorny canes (I mean thorny...not like red raspberry), leaf appearance, berry shape and size and time of fruiting. They both only fruit once each season from 2nd year canes. The only difference being one produces a yellow fruit that turns darker as it ripens. The canes of the yellow raspberry remain green while the black raspberry canes are purple. The yellow taste a bit different than the black and they are also not as tart. Very delicious though.
This past year I collected seeds from the yellow fruit in hopes of propagating them as the patch has been shrinking in recent years. I'm also doing tip layering on the existing plants to produce new ones also. The seeds grew well this past spring but I noticed that about 30% of the seedlings (just a rough guess) have purple canes while the rest are green like the parent plant they came from. This got me thinking that maybe the yellow berry were somehow genetically a form of the black ones. Then I found this on wikipedia:
"As suggested by the common name, black raspberries usually have very dark purple-black fruits, rich in anthocyanin pigments. However, due to occasional mutations in the genes controlling anthocyanin production, yellow-fruited variants (yellow raspberries) sometimes occur, and have been occasionally propagated, especially in home/farm gardens in the midwestern United States (e.g.,Ohio). The yellow-fruited variants of the black raspberry retain that species' distinctive flavor, different from the similar-appearing pale-fruited variants of cultivated red raspberries (generally the Eurasian Rubus idaeus, but with some being the North American Rubus strigosus, and other cultivars representing hybrids between these two widespread species)."
I'm wondering if what I have is a mutated version of the black raspberry or blackcap??
I have not found any commercial varieties of yellow raspberry that matches the type of plant these ones grow on. All the ones I have found appear to be a variety related to the red raspberry and has similar growing characteristics as the red.
Has anyone seen this variety of berry before?