Calla lily, Poinsettia, Bougainvillea. Three of the plants in which people sometimes mistake leaves for flowers. Gardens and hedges in Mumbai are full of the splashy colours of Bougainvillea right now. But the colourful stuff isn’t petals, they are just the leaves surrounding the true flower. The youngest niece asked me, “What’s the difference?” Well, the petals unfurl from inside the bud, but the bracts, these differently coloured leaves, develop from the stem just as normal leaves would do. Hers was a deep question if I read it differently. One parts of the “abominable question” of the rise of flowering plants which exercised Darwin was the origin of petals. Are they modified leaves, or modified stamen? Modern methods are beginning to answer this question, but the understanding can change yet. Current opinion leans towards petals rising from bracts.
In our balcony I caught the bracts in the middle of changing colour. In the featured photo you can see the green stalks of the buds just about to open into tiny flowers. The leaves around them have started losing their chlorophyll. The transformation has progressed further in the leaves closest to the bud. A few of the leaves in this cluster are more green, presumably having started the transition later. Further back in the same branch you see a small cluster of leaves which have just begun to turn colour.
Just for fun, here is another of my experiments with black and white. This time I wanted to get the difference in texture between the leaf and the bract, and colour distracts from texture. I’m happy to have caught this plant at the right time.