Erect deciduous shrub 2-3 m tall. Leaves mostly more than 8 cm long, deeply 3-lobed with large, sometimes rounded saw-teeth. Epicalyx bracts 6-8. Flowers single or double with many cultivars in a range of colours; summer to autumn. Staminal column shorter than the petals.
3-lobed leaves; stamens shorter than the petals.
A selection of popular H. syriacus cultivars can be found under the Cultivar tab.
Source: (1997). Hibiscus. In: . Horticultural Flora of South-eastern Australia. Volume 2. Flowering plants. Dicotyledons. Part 1. The identification of garden and cultivated plants. University of New South Wales Press.
, 'Amablis', 'Amaroo Pink', 'Apricot Parade', 'Bali Hi', 'Betty's Bouquet', 'Boondah', 'Bronze Prince', 'Canary Girl', 'Carnival', 'Carnival Queen', 'Catherin w', 'Christopher Howie', 'Cindy', 'Copenhagen', 'Copper Queen', 'Cynthia', 'Denis Whitehead', 'Doris Hoffmann', 'Emily', 'FiFi', 'Frances Silva', 'Galaxy', 'Harold Holt', 'Hazel Cummings', 'Jean Diggs', 'Jim Howie', 'John Massie', 'Kimberley Alison', 'Lani 2', 'Lavender Marble', 'Lemon Rays', 'Madam xx', 'Margot Kelly', 'Marjory Mundt', 'Mary Bishop', 'Mary Brady', 'Masonala', 'My Fair Lady', 'Nancy Beatty', 'Neredah Banff', 'Nocturne', 'Orange Glow', 'Patricia', 'Perfection', 'Phyllis McMullen', 'Pindari', 'Pink Cameo', 'Pink Radiance', 'Pretty Baby', 'Ramblin' Rose', 'Raspberry Crepe', 'Rebecca', 'Red n' White', 'Red Blitz', 'Red Bombora', 'Revelation', 'Rhonda d', 'Rocky Road', 'Satu', 'Scarlet Pimpernel', 'Sharon Dee', 'Shirley Mae', 'Show Business', 'Sonia', 'Star Burst', 'Summer Tan', 'Sun and Sand', 'Sundown', 'Sunny Giant', 'Surfie Jack', 'Susanah Phillips', 'Sylvia McGilvary', 'Timothy Howie', 'Twinkle Star', 'Vivienne', 'Warriewood Gem', 'Yvonne'.
Flowers semi-double to 9 cm wide, soft lavender to mauve with a large crimson eye, petaloids in the centre slightly paler. Habit medium shrub to 3 m tall.
Flowers single, to 7 cm wide, pale violet with a reddish basal spot radiating out through the petals. Habit tall shrub to 4 m tall.
Flowers single, overlapping, to 13 cm wide, pure white. Habit a low shrub to 1.5 m tall.
Flowers single, overlapping, to 12 cm wide, white with a red eye. Habit low shrub to 1.5 m tall.
Flowers double, to 10 cm wide, deep red with a deeper centre. Habit low shrub to 1.5 m tall.
Flowers double, 5-7 cm wide, reddish purple, fading in strong sun. Habit low shrub to 1.7 m tall.
Flowers semi-double to 10 cm wide, basic colour white with reverse side of some petals rose and a crimson eye radiating out through the petals. Habit medium shrub to 2 m tall.
Flowers single to 12 cm wide, deep rose to reddish with a deeper coloured eye. Habit low shrub to 1.5 m tall.