This is the second part of our series on understanding the anatomy of the plant you would like to paint.
In this article we will focus on complex flowers "Asteraceae" which includes daisies, sunflowers and asters. We hope you enjoyed the accompanying online broadcast and look out for our next session in a few weeks time. This is of course dependent on what is flowering.
For those members who missed the "live" session here is a link to the recorded version on the ABBA YouTube Channel.
Episode 2. Complex Flowers
If you have a few minutes it may be useful to view the broadcast first and then dive into this piece or the other way round. While you are there subscribe to the ABBA YouTube Channel and get notification when a new video is added.
The Three B's... Complex Flowers
In this second session we are going to look at the daisy family and it's clear from the title that the flower we are looking at today is not simple. These are plants that people often want to illustrate but are put off by the seeming complexity of their structure. Understanding how parts fit together makes it easier to produce an accurate image.
Species: L. vulgare
Common names: Ox-Eye daisy, dog daisy, field daisy, moon daisy, moon-penny, poor-land penny, poverty daisy and white daisy
The name Leucanthemum derives from the Greek words – leukos ("white") and – anthemon ("flower").
The beautiful white flowers of the Ox-Eye daisy adorn our verges and make a beautiful sight amongst red poppies, white and red Campion and native grasses. However, outside of its native habitat of Europe, Turkey and Georgia it can be considered as an invasive species. Ox-eye daisy spreads by seeds and by shallow, creeping rhizomes so can be hard to eradicate once established. Those in the garden are quite invasive but so beautiful they are soon forgiven.
The flat open structure makes them an ideal food source for insects and they are visited by bees, pollen beetles and other small insects. When viewed from above as shown in Figure 2, you can see the complex arrangement of the parts that make up the flower head, particularly the spiral whorls feeding off the centre which is a characteristic of the early stages of development of the flower.
When you look closely as shown in a partially dissected specimen (Figure 3) the flowers in this family are are not just single flowers but a bunch of numerous tiny flowers, termed florets, grouped together like pins on a pincushion. The florets are attached to a structure known as the receptacle and the two combined with the bracts underneath are termed a capitulum. Each capitulum is situated on the end of a flower stalk, the pedicel.
The florets can be further divided into two different types:
tubular disc florets (the yellow florets in Figure 3)
ray florets (white) attached the the outer edges of the receptacle
Flowers within the family may have:
a mix of floret types
all ray florets
all tubular disc florets
A floret is made up of an an inferior ovary as the flower parts are arranged above the ovary, five petals joined to form a petal tube and a tube of five anthers surrounding the style capped with two stigmas as shown in Figure 4. In this figure the florets A and B are typical of the Ox-Eye daisy while the floret C, shows the addition of a pappus which is formed from modified sepals. This structure is important for wind dispersal since it acts like a parachute. Think about a dandilion!
The fertilised ovary develops into a striking ten ribbed seed and upto 26,000 seeds can be dispersed from any one plant.
At the top of the stem underneath the base of the receptacle are a cup shaped structure known as the Involucre which is made up of green bracts. These are tipped with deep purplish-brown as shown in Figure 5.
In the video that accompanies this blog you can follow the complete dissection of this complex flower which will give you a good understanding of how this plant is constructed. Lets just say a little bit of reverse engineering. If you do this for all the plants you would like to paint then the parts can then be photographed and added to your sketchbook with the appropriate notes.