This page is in Japanese, so use Google translate, via chrome. This page has detailed photos and descriptions. Might be my new favorite! Page compares Acer palmatum: -Acer palmatum : Iroha-momiji -Acer matsumurae : Yama-momiji -Acer amoenum : Oh-momiji 葉と枝による樹木検索図鑑−類似種の見分け方 他：イロハモミジ-ヤマモミジ-オオモミジ Very detailed photos and information for each. The bottom of the page discusses how to distinguish between the three.
This link compares: Acer japonicum : Hauchiwa-kaede Acer sieboldianum : Ko-hauchiwa-kaede Acer tenuifolium : Hina-uchiwa-kaede Acer shirasawanum : Oh-itaya-meigetsu 葉と枝による樹木検索図鑑−類似種の見分け方 他：ハウチワカエデ-コハウチワカエデ-ヒナウチワカエデ-オオイタヤメイゲツ
This link covers: Acer rufinerve: Uri-hada-kaede Acer nipponicum: Tetsu-kaede Acer crataegifolium: Uri-kaede 葉と枝による樹木検索図鑑−類似種の見分け方 他：ウリハダカエデ-ウリカエデ-テツカエデ-カラコギカエデ
As an example, this is the translated page for Acer palmatum: (Note it is best to go to the website using Google translate via Chrome, because the page is in a table format for easy comparison) Ilohomomiji Yamamomiji Oomomiji Muclawaceae Kaede Muclawaceae Kaede Muclawaceae Kaede Leaves and branches ① Distribution etc.: Deciduous trees growing naturally in the mountains of Honshu (west of Fukushima prefecture), Shikoku, Kyushu. Male and female stocks. It will be 10 ~ 15 m in height. ② Classification: Hardwood (erect) - Single leaf - Mitotic leaf - Birth (Fig. 10). ③ Leaves are living. ① Distribution etc.: Deciduous trees growing naturally in places with a little humidity such as valleys in Hokkaido, Honshu (Aomori prefecture ~ Shimane prefecture mainly on the Sea of Japan side). Male and female stocks. Indigenous species in Japan. It will be 10 ~ 15 m in height. ② Classification: Hardwood (erect) - Single leaf - Mitotic leaf - Birth (Fig. 10). ③ Leaves are living. ① Distribution etc.: Deciduous trees growing naturally in mountains of Hokkaido, Honshu, Shikoku and Kyushu.Male and female stocks.Indigenous species in Japan. It will be 10 ~ 15 m in height. ② Classification: Hardwood (erect) - Single leaf - Mitotic leaf - Birth (Fig. 10). ③ Leaves are living. Leaf table ④ Lamina isapproximately circular with a length of 4 cm to 6 cm and a width of 3 to 7cm .. ⑤ Petiole is 1.5 - 3 cm. ⑥ Leaf margin deeply deeply palm-shaped 5- to 7-fold (rarely 9 fissures). ⑦ Each piece of lengthens in a caudate shape with a sharp pointededge , withirregular heavy teeth . ⑧ The base is truncated or heart shaped with 5 to 9 palmar arteries. ⑨ Leaf quality is paper quality, the surface is green, there is first hairs, but then it becomes hairless. ④ leaf blade is approximately circular with a length of 5 to 10 cm and a width of 5 to 10 cm . ⑤ Petiole is 4-6 cm. ⑤ Leaf margin is 9 fissures (rarely 5-7 fissures) from medium to deep in the palm shape. ⑦ Each piece of lengthens in a caudate shape with a sharp pointed edge, and there areirregular heavy teeth on theedge . ⑧ The base is heart-shaped with 5 to 9 palmar arteries. ⑨ Leaf quality is paper quality, the surface is dark green and hairless. ④ The leaf blade isapproximately circular with alength of 7 to 12 cm and a width of 7 to 12 cm . ⑤ Petiole is 3 to 5 cm. ⑤ Leaf margin deeply palms deeply 5-7 fissures (rarely 9 fissures). ⑦ Each tear strip has a long tip and a sharp pointed tip, and there are fine single teeth or heavy teeth on the rim . ⑧ The base is truncated or shallow heart shape with 5 to 9 palmar arteries. ⑨ Leaf quality is paper quality, the surface is green and hairless. Expansion of leaves table ⑦ Each pieceof lengthens in a caudate shape with a sharp pointededge, and there areirregular heavy teeth on the edge . ⑦ Each piece of lengthens in a caudate shape with a sharp pointed edge, and there areirregular heavy teeth on theedge . ⑦ Each tear strip has a long tip and a sharp pointed tip, and there are fine single teeth or heavy teeth on the rim . Leaf table expansion 2 There is no groove on the upper surface of the petiole. Many petiolets have grooves on the top . . There is no groove on the upper surface of the petiole. Enlargedleaflets ⑪ The back side of the leaves is pale green with early hair, but after that it becomes hairless, but the hair remains in the base vein axil. ⑫ The young branches are green, but the surface may be reddish and hairless. ⑦ The back side is green, hair is present at the base of thepalmar vein and the axilla ⑦ The back side is light green,with light yellowish brown hair remaining at the base of thepalmar vein . The surface of the petiole has a reddish color. ⑧ Young branches are green to purplish purple and hairless. Points of how to distinguish Iroha Homiji, Yamamomiji and Oomomiji are similar in that the leaf margin is divided into 5 to 9 leaf margins in the genus Aceraceae and the shape of the leaves is almost circular, but in the following points It can be distinguished. (1) The size of the leaves is the smallestIrohomomorida is less than 6 cm in length , and the leaves of Yamamomiji and Oomomiji are about the same size and more than 6 cm in length. (2) Oomomiji leaves are large, fragments are mixed finely prepared single teeth and heavy teeth, whereas Irohomomiji and Yamamomiji have heavy teeth. (3) Both of Iroha Homiji and Yamamomiji have both irregular heavy teeth, while Yamamomiji has a larger leaf size than Iohamomiji, there are many cases where there are grooves in the upper part of the petiole, whereas the leafhopper is small There is no groove in the petiole . (4) Yamamomiji is mainly distributed on the Japan Sea side. Note: Many garden cultivars are made from these three species, and accurate distinction is difficult.
Done. I called it How to distinguish similar species, as what shows on the browser tab is "Search tree for trees with leaves and branches How to distinguish similar species Others:" (followed by four names that I don't think are names we use). So it's alphabetized under H.
