I lost my chance to ask Moriso Teraoka, who planted this cactus garden at Kapiolani Community College in Honolulu, as I didn't notice this until I was leaving, on my third visit, not when I had his attention. But many of the specimens were donated with no names supplied, so while I did get several names of interesting plants, some are mysteries. Like this one. This has spines on the trunk that are at least superficially arranged like on a cactus. When I saw it, I was trying to stay open to the possibility that it actually was a cactus, but I didn't notice spines on the branches, which just look like tree branches, with alternate broad leaves. The quince-like fruits are irregularly shaped, with green leafy bits here and there.
That's Pereskia? So Pereskia grandiflora? I didn't even think of it, because I thought this was Pereskia and it didn't occur to me that they were the same genus. Now I see the little green bits. Is this one below Pereskia lychnidiflora? This was the only open flower. I couldn't even figure out if the other things are flower buds or fruits. I'm pleased at least I got the cactus part.
I only know these to the genus level. In some ways the pink one looks more orthodox than the orange one. They had a grouping of much dwarfer examples of the pink one blooming at the Fullerton Arboretum during a recent winter, these were not labeled either. During the 1970s the Botany Department greenhouse on the roof of one of the buildings at WSU had a large, vining Pereskia trained against one or more of the inside surfaces of the glass. There was also a fairly big Cycas revoluta and so on. Maybe the Abelson Greenhouse replaced the building that was on the roof during my time; on the page below they are talking about the Murrow Greenhouse like it was the one I got into - but the location is wrong. http://sbs.wsu.edu/facilities/greenhouses.html
Someone just posted on my photo of Pereskia lychnidiflora that it's Leuenbergeria lychnidiflora. Tropikos shows the first name is the basionym. I'm glad to that these two have different names now.
