It is white the same reason snow is white — because of the pockets of air in the petal. If you find that a preposterous idea, the next time you walk under a frangipani tree, pick up a flower from the ground and crush out the air pockets in the petal with your fingernail. The result? A limp, transparent petal that is no longer white. This is true for the majority of white flowers.
Did you know that some trees give out toxic substances to keep other plants from growing too close? One Greek scientist in 1 A.D. described the shade of a Black Walnut as "heavy" and "poisonous".
Other plants such as the Alpine Pennycress absorb large amounts of lead, zinc, and cadmium, storing them safely in their cells. In Boston, the Alpine Pennycress was used to clean up a backyard that was contaminated with toxic waste! Apparently, Sunflowers are also capable of absorbing radioactive material. That bit of information made me a bit worried about eating too many sunflower seeds...
(Like my photos? Smole and I took these at MacRitchie a while back. Flowers make the best models.)
Sounds like a great book -- but it would be better if YOUR photos were in it. They're wonderful!
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