| Section | Trigonocarpae Gordon | |
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| Scientific Name | Type species | Viola obtusa (Makino) Makino Nioi Tatitubo Sumire Published in: B. M. T. 26: 151 (1912) |
| Variety |
V. obtusa var. tsuifengensis T.Hashim. Taiwan Nioi Tatitubo Sumire 翠峰菫菜 First published in Ann. Tsukuba Bot. Gard. 6: 3 (1987) V. obtusa var. lucida Hama Nioi Tatitubo Sumire in Flora-Kanagawa Association, Flora of Kanagawa 1988:952 (1988)
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| Form |
V. obtusa f. hemileuca Sugimoto Otome Nioi Tatitubo Sumire Published in: Keys Herb. Pl. Jap. 1 (Dicot.): 352 & 735 (1965) V. obtusa f. chibae (Makino) Hiyama et F.Maek. Sirobana Nioi Tatitubo Sumire First published in H.Hara, Enum. Spermatophytarum Japon. 3: 210 (1954) V. obtusa f. nuda (Ohwi) F.Maek. Teriha Nioi Tatitubo Sumire First published in H.Hara, Enum. Spermatophytarum Japon. 3: 210 (1954) |
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| Synonym | Viola ovato-oblonga (Miq.) Makino var. obtusa Makino [B. M. T. 21: 59 (1907)] | |
| Origin | obtusa : roundish | |
| Common names | [Taiwanese ] 翠峰菫菜 | |
| Stalk Form | A flower scape is extended from a stalk, and a flower blooms from each scape. | |
| Habitat | It grows wild under the wood which is bright and dried. | |
| Distribution | Japan domestic | It grows naturally in the Japanese whole country from South Hokkaido to Yakushima. |
| Japan overseas | Korean Peninsula, Northeastern China, and Taiwan. | |
| Others | ||
| Flower | Shape | Middle size. Round and organized. The individual petals are also round. The side valve is hairless. |
| Color | The whole flower is purplish red from dark purple, and the central part is white, purple-striate on low petal. | |
| Spur | Thick cylindrical shape. | |
| Season | Bloom a little early. | |
| Stigma | Rod-shaped. | |
| Aromatic | Has a sweet fragrance. | |
| Others | White fine hairs are dense on the flower stem. | |
| Leaf | Shape | Middle size. Egg shape. It changes into a long and narrow triangle in summer. |
| Color | Both sides are deep green. | |
| Others | ||
| Seed | Shape | Rounded. |
| Color | Dark brown. | |
| Others | ||
| Characteristics of roots | ||
| Endangered Information | Yamagata：EndangeredⅡ, Tokyo：EndangeredⅠ | |
| Type Specimen |
V. obtusa f. chibae : Rikutyu : Mukaiyama near Ichinoseki、may 2, 1909 by Yoshio Chiba
V. obtusa f. nuda : Nasu vil., Totigi Pref. (Kyoto University Collection)
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| Chromosome Number | 2n=20 | |
| Reference Information | ||
| Others ( Sample ) |
V. obtusa f. hemileuca White flower with pink spur Iwate / May 2, 2002 
V. obtusa f. chibae Pure-white flower Tokyo / April 3, 2006 Cultivation 
V. obtusa f. nuda Gloss and hairless Kanagawa / March 21, 2007 Cultivation |
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