Viola × williamsii explained

Viola × williamsii, known as hybrid horned pansy, tufted pansy, or just horned pansy, is a hybrid between Viola cornuta and V. × wittrockiana (which itself is a hybrid of V. tricolor, V. lutea and V. altaica).^{[1] [2]} The epithet is named for Benjamin Samuel Williams.

It differs from V. cornuta in having wider, slightly overlapping petals, the lateral ones directed outwards or upwards, and more deeply dentate to laciniate stipules with the apical lobe clearly narrowed towards the base. It differs from V. × wittrockiana in at least one of the following characters: perennial habit, scented flowers and a longer spur.^[3]

Bibliography

• Web site: MBG. Missouri Botanical Garden. Viola cornuta . Plant finder . 28 April 2020. 2020.
• Web site: Viola ×williamsii . Plant Encyclopaedia . Alpine Garden Society. 28 April 2020 . 2018. .
• Web site: Dave's Garden. Viola, Horned Violet, Tufted Pansy 'King Henry'. 28 April 2020. 2020. .

Notes and References

1. Wittrock. Veit Brecher. 1897. Viola-studier I. Morfologisk-biologiska och systematiska studier öfver Viola tricolor (L.) och hennes närmare anförvandter. Acta Horti Bergiani. 2. 1. 117.
2. Viola-studier II. Bidrag till de odlade penséernas historia med särskild hänsyn till deras härkomst. Wittrock. Veit Brecher. Acta Horti Bergiani. 7. 1895. 2. 5–6.
3. Book: Karlsson, Thomas. Thymelaeaceae - Apiaceae. Marcussen. Thomas. Wind. Peter. Jonsell. Bengt. Royal Swedish Academy Sciences. 2010. 9789186510619. Jonsell. Bengt. Flora Nordica. 6. Stockholm. Violaceae. Karlsson. Thomas.