I am posting this with some trepidation, as there has been talk about how hard these Acanthus, or bear's breeches, plants are to distinguish, but my interest was piqued by Douglas Justice's August 2020 In the Neighbourhood - UBC Botanical Garden blog, in which he included Acanthus hungaricus, saying that "[t]he most common of these is A. hungaricus (which is sometimes sold as A. balanicus, and often misidentified as A. spinosus). I of course had never heard the name "hungaricus" at all. I have posted this quote elsewhere, which Douglas sent me in an email: Acanthus hungaricus (syn. A. balanicus) has dissected leaves with deep, broad sinuses, the base of the sinus is a flange of leaf tissue that parallels the midrib. The spine tipped lobes are not particularly sharp.Well, it turns out these are pretty common, in spite of my impression that I was seeing more of another species. Here are some photos. Looking very similar to me, but feeling very different is Acanthus spinosus, which Douglas described: In A. spinosus, the lobe tips are sharp and numerous and the sinus is narrower and does not terminate in a flange along the midrib.Here is a boulevard planting that called out to me as I was driving by yesterday. These leaves have a much higher owie factor. I'm not sure about the other characteristics, but there are more places where there isn't a midrib flange. At the other end of the owie spectrum is Acanthus mollis - "mollis" means soft, referring to the leaves. These still have spiky flowers, but the leaves do not have spiny edges and the sinuses are much more shallow, leaving a large central flange. Some of these seem to have more spines on the flowers than others. A few years ago I photographed this Acanthus mollis Latifolius Group plant at UBCBG. I really don't know what to learn from this. I would for sure have assumed it was A. hungaricus. IF I had known that name yet.