A bottlebrush by any other name. I have two in my tiny yard. I call them B1 and B2. B1 (on the left) is shy and hardly ever flowers. B2 (on the right) struts the stage several times a year with prolific flowering and a family of ever feasting noisy mynahs.

From https://www.oznativeplants.com/plant/Callistemon.html

Callistemon brachyandrus (Prickly Bottlebrush) Height 1m - 4m Spread 1m - 3m

Prickly Bottlebrush is a stiff shrub or small tree growing about 4 m tall. The leaves are linear with a pointed tip, growing about 2 cm to 4 cm long and 1 mm wide. Flowers are produced in bottlebrush spikes, about 3 cm to 5 cm long. The flowers are crimson red with yellow anthers.

Callistemon citrinus ‘Firebrand’ Height 0.6m Spread 2.5m

Callistemon ‘Firebrand’ is a semi-prostrate shrub growing to about 60 cm tall. It originated from a seedling grown by Austraflora Nursery and was originally known as Callistemon ‘Austraflora Firebrand’ . It produces bottlebrush spikes of red flowers.

Callistemon citrinus ‘Splendens’ Height 2m - 2.5m Spread 1.5m - 2m

Callistemon ‘Splendens’ is an upright shrub growing to about two metres in height (sometimes taller). The leaves are elliptical and grow to about 9 cm long. New growth is pink. The It produces red bottlebrush spikes mainly in spring, and sometimes more often.

Callistemon citrinus (Crimson Bottlebrush) Height 2m - 5m Spread 2m - 4m

Crimson Bottlebrush is a shrub growing to 5 m tall. The leaves are hard and flat, narrow with the widest portion near the tip, and grow to about 2.5cm to 10 cm long and 4 mm to 25 mm wide. The leaf tip is pointed. The flowers are red with purple anthers.

Callistemon glaucus (Albany Bottlebrush) Height 2m - 3m Spread 1.5m

Albany Bottlebrush is a shrub growing to 3 m tall. The leaves are flat and narrow growing 4 cm to 13 cm long and 3 mm to 18 mm wide. The flowers are bright red, and produced in bottlebrush spikes, 7.5 cm in diameter.

Callistemon linearis (Narrow-leaved Bottlebrush) Height 2m - 3m Spread 2m - 3m

Narrow-leaved Bottlebrush is a stiff shrub growing to 3 m tall. The leaves are narrow and linear growing 4 cm to 11 cm long and about 1 mm to 3 mm wide. The flowers are red and produced in bottlebrush spikes, about 5 cm to 10 cm long and 4 cm to 6cm wide.

Callistemon montanus (Mountain Bottlebrush) Height 2m - 6m Spread 1m - 2m

Mountain Bottlebrush is a shrub or small tree growing to 6 m tall. The leaves are flat, narrow oval with the widest portion nearer the pointed tip, growing 5 cm to 10 cm long, 6mm to 11 mm wide. New growth is pinkish. The flowers are bright red or crimson.

Callistemon pachyphyllus (Wallum Bottlebrush) Height 0.5m - 3m Spread 0.5m - 1.5m Wallum Bottlebrush is a shrub that grows to about 3 m tall. The grey-green leaves are flat, narrow with the widest portion near the tip, growing about 5 cm to 9 cm long. The leaf tip is pointed. The flowers are crimson or (rarely) greenish yellow.

Callistemon pallidus (Lemon Bottlebrush) Height 2m - 5m Spread 2m - 5m Lemon Bottlebrush is a shrub or tree growing to 5 m tall. The leaves are flat, narrow elliptical, growing 3 cm to 7 cm long and about 1 cm to 1.5 cm wide. The flowers are yellow or cream and produced in bottlebrush spikes, about 3 cm to 7 cm long.

Callistemon pearsonii (Blacktown Callistemon) Height 1.5m Spread 1.5m Blacktown Callistemon is a shrub growing to 1.5 m tall. The leaves are flat, narrow and linear with a sharp tip growing to about 3 cm long. The flowers are red and produced in bottlebrush spikes, about 4 cm long and 5 cm to 6 cm in diameter.

Callistemon phoeniceus (Lesser Bottlebrush) Height 2m - 6m Spread 3m - 5m Lesser Bottlebrush is a shrub or small tree growing to 6 m tall. The leaves are blue-green, flat and linear growing 3 cm to 7 cm long. The flowers are red or scarlet and produced in bottlebrush spikes, about 10 cm to 15 cm long and 5 cm to 6 cm in diameter.

Callistemon pinifolius (Pine-leaved Bottlebrush) Height 0.5m - 3m Spread 2m - 3m Pine-leaved Bottlebrush is a shrub growing to about 3 m tall. The leaves are narrow and linear with sharp points, growing 4 cm to 10 cm long and about 1 mm wide. The flowers are yellowish green or red and produced in bottlebrush spikes, about 5 cm to 7 cm long and 4 cm to 5 cm in diameter.

Callistemon pityoides (Alpine Bottlebrush) Height 1m - 3m Spread 1m - 2.5m Alpine Bottlebrush is a shrub growing to 3 m tall. The leaves are flat, narrow linear growing about 1 cm to 2 cm long and about 1 mm wide with a sharp point. The flowers are yellow or cream and produced in bottlebrush spikes, about 3 cm to 7 cm long and 2 cm to 2.5 cm in diameter.

Callistemon polandii (Gold-tipped Bottlebrush) Height 2m - 4m Spread 1m - 3m Gold-tipped Bottlebrush is a shrub growing to 4 m tall. The leaves are flat, narrow elliptical tapering to a point. The flowers are bright red with yellow tips and produced in bottlebrush spikes, about 5 cm to 6 cm in diameter.

Callistemon rugulosus (Scarlet Bottlebrush) Height 2m - 4m Spread 2m - 4m Scarlet Bottlebrush is a shrub growing to about 4 m tall. The rigid leaves are flat and narrow growing about 5 cm long and 7 mm wide, with a sharp point. The flowers are crimson or purple with yellow tips produced in bottlebrush spikes.

Callistemon salignus (Willow Bottlebrush) Height 5m - 15m Spread 3m - 5m Willow Bottlebrush is a shrub or tree growing to 15 m tall. New growth is pink. The leaves are flat, narrow elliptic in shape. The flowers are creamy white and produced in bottlebrush spikes about 5 cm to 8 cm long and about 3 cm in diameter.

Callistemon teretifolius (Needle Bottlebrush) Height 1m - 2m Spread 1m - 3m Needle Bottlebrush is a shrub growing to 2 m tall. The leaves are needle shaped, growing 5 cm to 11 cm long and 1 mm to 1.5 mm wide with sharp point. The flowers are bright red or orange and produced in bottlebrush spikes, about 5 cm to 7 cm long.

Callistemon viminalis ‘Hannah Ray’ Height 3m - 5m Spread 2m - 3m Callistemon ‘Hannah Ray’ is a large weeping shrub growing to about 4 m tall. It is a cultivar of Callistemon viminals, the Weeping Bottlebrush. The leaves are narrow and lance-shaped. New growth is bright pink. The plant produces profuse clusters of red bottlebrush flowers in spring and autumn.

Callistemon viminalis ‘Wildfire’ Height 4m Spread 2m Callistemon viminalis ‘Wildfire’ is a tall growing shrub or small tree soft pale green new growth. It produces masses of bright red bottlebrush flowers mainly in spring. The growth habit is lightly weeping.

Callistemon viminalis (Weeping Bottlebrush) Height 3m - 6m Spread 1.5m - 5m The Weeping Bottlebrush is a small to medium sized weeping tree with red bottlebrush flowers in spring, with flushes in summer and autumn.

Callistemon ‘Eureka’ Height 2m - 4m Spread 2m - 3m Callistemon ‘Eureka’ is a dense upright shrub growing up to about 4 m tall. It is fast growing producing flushes of pink red new growth. Clusters of bright pink bottlebrush flowers are produced in spring.

Callistemon ‘Harkness’ Height 3m - 6m Spread 2m - 6m Callistemon ‘Harkness’ produces long dense bottlebrush flower spikes that grow up to 15 cm long, and are red in colour. The cultivar is named Mr. GLJ Harkness of Gawler, South Australia.

Callistemon ‘Kings Park Special’ Height 3m - 5m Spread 3m - 4m Callistemon ‘Kings Park Special’ is a small tree grows from 3 to 5m tall and 3 to 4m wide. It produces bottlebrush flower spikes that grow up to 13 cm long and 6 cm wide, and are bright red in colour. The cultivar was grown from a seedling at Kings Park and Botanic Gardens in Perth.

Callistemon ‘Lavender Showers’ Height 2m Spread 1.5m - 2m Callistemon ‘Lavender Showers’ is a large shrub or small tree with lavender pink bottlebrush flowers in spring and summer. The leaves are rigid, narrow and lance shaped. The flower spike is a typical bottlebrush shape.

Callistemon ‘Little John’ Height 1m Spread 1m Callistemon ‘Little John’ is a dwarf shrub. It produces red bottlebrush flower spikes. The shrub was selected by Ken Dunstan of Alstonville, New South Wales.

Callistemon ‘Mauve Mist’ Height 2m - 4m Spread 2m - 4m Callistemon ‘Mauve Mist’ is a dense shrub that grows to a height of about 3m.It produces bottlebrush flower spikes that grow up to 7 cm long and 5 cm wide, and are pink mauve in colour.

Callistemon ‘Pink Champagne’ Height 3m Spread 2m Callistemon ‘Pink Champagne’ is a upright shrub with pink bottlebrush flowers with yellow anthers in spring and autumn. The grey green foliage is fairly hard and lance shaped.

Callistemon ‘Purple Splendour’ Height 2m - 4m Spread 2m - 4m Callistemon 'Purple Splendour" is a dense bushy shrub with clusters of red purple bottlebrush flowers with yellow tipped stamens in spring. There are a number of similar cultivars including Callistemon “Violaceus”, “Purple Cloud” and “Mauve Mist”.

Callistemon ‘Rose Opal’ Height 1.5m - 2m Spread 1.5m Callistemon ‘Rose Opal’ is a compact dwarf form of the Weeping Bottlebrush, Callistemon viminalis. It produces clusters of red bottlebrush flowers in spring and autumn. The flower spike is 70mm to 80mm long and fades to rose red.

Callistemon ‘Taree Pink’ Height 2m - 3m Spread 2m Callistemon ‘Taree Pink’ is a medium sized shrub with long slender bright pink bottlebrush flowers in spring. The shrub is dense growing, especially when pruned, and has soft pink new growth.