A plant of unknown origin, and it came to me erroneously labelled as B. delavayi. The individual flowers are a little larger than others of this type, and the inflorescence panicle is more densely packed. It has crossed readily with other B. forrestii plants.
Another collection from the Cangsham above Dali (Yunnan, China). I grew several of these from seed, and this one was my favourite. It has darker mauve flowers than either its siblings or other collections from this location, for example ACE 2522.
This plant with mauve flowers is a mystery. Labelled as B. limitanea, and looking exactly the same in habit and leaf as that form, the flowers are rather atypical in having longer, cylindrical corolla tubes and slightly tomentose (felted) parts. Its origins are unknown, and I suspect it is either a natural hybrid or one raised ex situ. It certainly looks to be descended from B. forrestii, and probably the B. limitanea form; what other species is involved is more of a mystery, but B. davidii is possible. I have speculated it may be the hybrid Buddleja X ‘Hotblackiana’ (B. forrestii X B. davidii) currently thought lost to horticulture, although I am unable to confirm this. It’s fully fertile and I have raised a number of its seedlings. It can cross with several different species.
A chance hybrid I raised a while back, the pollen parent is probably B. davidii 'Gulliver'. Very long pancicles like the seed parent; although the individual flowers are more delicate. Heavy B. forrestii foliage, and generally looking like that species, it's proving hardy and not too vigorous.
Not every hybridisation I try works, and in this case the reciprocal failed. B. nivea is quite promiscuous and can be pollinated by many of the Asian species. With most of these hybrids, the B. nivea traits tend to dominate. This one is unusual: the foliage isn't very hairy and the individual flowers are quite large.
An example of the species growing in situ at 2000m, Lenteng, Mizoram, India. Some plants have these very upright and dense panicles. However, the individual flowers are identical to any other member of the species.
Photo by Paul Barney, Edulis Plants.
An example of the species growing in situ, Shirui, Manipur, India. The more familiar less upright panicle.
Photo by Paul Barney, Edulis Plants.
B. macrostachya seedling from a cross I made of RF 040 X
GWJ 9286. In some seedlings RF 040’s features were dominant and a
couple even had pink flowers. This one has inherited some of the
features found in the flowers of GWJ 9286, such as the intense orange
throat and softer, pure white corolla lobes. Interestingly, it also
flowered much later (well into October) than its siblings. Only one of
ten inherited the smaller, silvery foliage of GWJ 9286.
Buddleja macrostachya is a polyploid species with a large genome, so a cross of two unrelated plants can throw up surprises. Two white-flowered parents may produce seedlings with pigmented flowers. This is a full sibling of the one above and has flowers that are bright pink; otherwise it's essentially the same as its siblings in form. The genetics of flower colour in Buddleja has not been extensively studied, although white flower colour is known to exhibit some dominance in B. davidii.
B. macrostachya seedling from the reciprocal cross to the two shown above: GWJ 9286 x
RF 040. The variable siblings were all intermediate between the
parents, although the features of RF 040 showed some dominance. This
one has inherited the inflorescence form of RF 040. All the plants of
both reciprocals were unmistakably B. macrostachya and all set
seed. They gave no reason to think they might be inter-specific