Endemic variant species - found only on Mt. Apoi and featuring two or three morphological changes from fundamental species due to the influence of peridotites
Apoiazumagiku (Erigeron thunbergii var. angustifolius), Samaniyukiwari (Primula modesta var. samanimontana), Himeshiraneninjin (Tilingia ajanensis var. angustissima), Apoiyamabukishoma (Aruncus dioicus var. subrotundtus), Apoitsumekusa (Arenaria katoana var. lanceolata), Apoimantema (Silene repens var. apoiensis), Apoikinbai (Potentilla matsumurae var. apoiensis), Apoikaramatsu (Thalictrum foltidum var. apoiense)
Quasi-endemic variant species - found only in ultrabasic rock and limestone areas on the Apoi Mountains and in one or two other regions
Chaboyamahagi (Lespedeza bicolor var. nana, Cape Erimo), Hidakatorikabuto (Aconitum yuparense var. apoiense, Hidaka Mountains), Himeezonegi (Allium schoenoprasum var. yezomonticola; Mt. Obira), Ezosaiko (also known as Hosobanokoganesaiko, Bupleurum nipponicum var. yesoense; Hidaka Mountains, Yubari Mountains), Ezokisumire (Viola brevistipulata var. hidakana; Hidaka Mountains, Yubari Mountains, Teshio Mountains), Birodoezoshiogama (Pedicularis yezoensis var. pubescens; Hidaka Mountains, Yubari Mountains, Shiribeshi), Apoizekisho (also known as Chabozekisho, Tofieldia coccinea var. kondoi; Hidaka Mountains, Yoichi Mountains, Mt. Obira, Okushiri Island; classified as a quasi-endemic variant species due to nomenclature with the proper-noun prefix Apoi)
Endemic varieties - found only in the Apoi Mountains and featuring one or two morphological changes from fundamental plants (species, subspecies, variant species) due to the influence of peridotites
Apoikuwagata (Veronica schmidtiana var. yezoalpina f. exigua), Apoihahako (Anaphalis alpicola f. robusta), Apoimisebaya (Hylotelephium cauticolum f. montanum), Apoijaninjin (Cardamine schinziana O.E.Schulz var. lasiocarpa (H. Hara) Koidz; unconfirmed)
Quasi-endemic varieties - found in the Apoi Mountains and one or two other regions
Ezonohakusanbofu (Peucedanum multivittatum f. linearilobum; Kariba Mountains, Mt. Washibetsu)
Hosobanoezonokogiriso (Achillea ptarmica ssp. macrocephala var. yezoensis; a rare ultrabasic species found in rocky tracts along the Horoman River; Toikanbetsu in Horonobe Town, Kamui Kotan)
Ezorurimurasaki (Eritrichium nipponicum var. yezoense; not classified as a Hokkaido endemic forms due to presence in Sakhalin; Hidaka Mountains, Yubari Mountains, Kitami Mountains, Rebun Island, Sakhalin)