Bottlebrush - Callistemon Citrinus

Members : Muhammad El-Hajje, Mariam Shadid, Zachary Thomas, Luisa Olmo

The Bottlebrush, is a native Australian plant belonging to the species Callistemon Citrinus.

Table 1: The floral characteristics of the Bottlebrush












1
2
3
4
5
6
7
8
Mean
SD
Stigma (cm)
1.75
1.95
1.75
1.6
1.8
1.7
1.75
1.8
1.76
0.0991
Anther (cm)
1.6
1.5
1.75
1.7
1.75
1.5
1.55
1.6
1.64
0.1032
Flowers per unit
30
34
*
*
*
*
*
*
32
2.8284
Height (cm)
7
6.5
*
*
*
*
*

6.75











0.353
Notes:

  • The above measurements were recorded using a ruler, therefore its accuracy is questionable
  • Height was measured starting from the first flower/pod


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Figure 1: Schematic illustration of the various components of the bottle brush, and its floral structures.

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Figure 2: Photograph displaying the size of the bottle brush


Nectar collections indicated that a maximum of 24microlitres, and it had a 21.2% concentration.
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Figure 3: View of pollen extracted from bottlebrush at x40 magnification. Pollen morphology

Animal vectors which pollinate these flowers are nectar feeding birds, such as Hummingbirds and insects.
Fertilisation methods involve using soil rich in organic components such as manure. Bottle brush plants require extreme heat to release their seeds and usually disperse their seeds after bush fires.
Bottle brush plants flower commonly in the warmer months of the year and produce many flowers.
The floral morphology of the Bottle Brush consists of small petals and a bright, distinctive flower which is often red. The most obvious part of the bottle brush unlike other flowers is the stamens. Each flower which extends from the fruiting capsule is an individual flower.

These colour of flowers ranges from pink, mauve, green and cream.