Douglas Justice's September in the Garden 2022 - UBC Botanical Garden blog is now out, a rerun of the September 2018 blog, but then, it was all Sorbus, with whitebeams being the Aria Group under Sorbus. Now, the whitebeams are genus Aria. I think this has been coming for some time now, but maybe this is their first outing at UBCBG with this name. Garden Explorer has not caught up yet, so I think there can't be a September 2022 tour on that page, and the labels on the trees haven't been changed yet, not that I can find those anyway. But I wanted to get the Aria names searchable. That led me to have to consult with Douglas on some names for whitebeams not in the blog, since I only found one that is in the blog - that's Aria hemsleyi, the one on Maries Trail. Note the silvery leaf undersides and golden-yellow russetted pomes. Douglas also told me to note "that the pomes of A. hemsleyi are flattened-globose, have a ... conspicuously lenticillate surface, and a wide cup with elevated sides (derived from the base of the persistent calyx) surrounding the tip of the carpel and remnants of the style and stamens." In the area around Wharton Glade is a favourite of mine, now called Aria caloneura. Here is an old favourite near the entrance to the garden, now Aria yuana. Well, now that Sorbus and Aria find themselves in different genera, that makes it pretty inconvenient for a tree that used to be called Sorbus x hybrida 'Gibbsii', a hybrid between S. aucuparia (European rowan) and S. intermedia (Swedish whitebeam). It's got itself a brand new name: Hedlundia hybrida. Douglas answered my query saying "yes, an intergeneric hybrid, but considered established (ancient), so no need for an x. It is an apomictic species, which means that all H. hybrida plants are genetically identical (all breed true from seed), so the cultivar name ‘Gibbsii’ is superfluous." That's Sorbus 'Joseph Rock' to the right of it. Edited - I forgot to include this spider web from the Wharton Glade.
Here's a link to photos from September 2018, where I posted photos of the Sorbus in the blog: September 2018 - Sorbus | UBC Botanical Garden Forums. This is a Sorbus I did photograph yesterday - S. harrowiana, near Wharton Glade on Lower Asian Way. Those awesome green things surrounding the branchlets are persistent stipules. This photo is the Sorbus 'Joseph Rock' on the entrance plaza.
Here is Aria thibetica, at the fence behind the Quercus myrsinifolia near the entrance to the garden. A lot of the pomes on this are pear-shaped.
This was never a Sorbus and is not an Aria, much to my surprise, but I have just learned that it's Viburnum sieboldii. It's in the Viburnaceae family, not Rosaceae. Only now I can see that it has opposite leaves, clearly shown in my photos. I've been calling it the jelly bean tree, but the fruit shape must be variable - there are several internet photos with round fruits. There was one posted for ID by @Susan G without fruit or flowers one year, and @Michael F recognized it as a viburnum. I was never ever going to figure that out, and the one in this location is not in Garden Explorer. I think there are two trees together in the habit photo.
