The flowers grow in a cluster near the top of the stem. There are often four or five in full bloom at once, gathered round a bunch of green buds which rises in the centre of the cluster. While the first cluster is in flower, the stem continues to grow, and by the time these flowers fall off, another cluster appears at the end of the lengthened stem, and so on. If you pull off one of the flower-petals you will see that the lower half is strap-shaped. But the petal is much broader at the other end, and it is round, with a tiny nick in the outer edge. In the centre there are six stamens whose tips you can just see where the four petals meet. But the seed-vessel is hidden until the petals and sepals and stamens fall off. It then grows into a thin green pod, and you will find many of these slender pods standing out from the hairy stem. Behind the yellow petals are four thin sepals. When the flower is fully out these lie flat open. They do not form a cup. The leaves of the Wild Mustard are dusty green. They are each in one piece and are broadly pointed, with the edges cut like the teeth of a saw. 3. HEDGE MUSTARD This is a very common little plant, but it is not at all attractive. You find it by the roadside and in waste places in early summer, and it always looks very dusty. The flowers are quite small. They grow in little clusters at the end of a long spike, and there are usually four or five flowers out at the same time. These flowers have each four tiny petals of a pale yellow colour, and unless you look very closely, and pull these petals gently apart, you will not see either the stamens or the seed-vessel, which are almost hidden from sight. The little green sepals at the back of each flower stand straight up from the stalk and form a cup. This cup has slits down the sides and it holds the flower. The stalk is almost covered with thin, hairy, green pods pressed closely against it. These pods hold the seeds, and they look like green caterpillars creeping up each side of the stem. The leaves of the Hedge Mustard are a dull grey-green colour and are very rough and hairy. Those nearest the ground have no stalks, they grow like a rosette, with one leaf close above another. But the leaves further up the stem are each separate. They are very much cut up, and their edges are toothed like a saw. PLATE III: 1. YELLOW HORNED POPPY 2. ROCK ROSE 3. OPPOSITE-LEAVED GOLDEN SAXIFRAGE 1. YELLOW HORNED POPPY The Yellow Horned Poppy grows all summer on sandy seashores or among stones. It is a showy plant, with large, orange-yellow flowers. Each flower has four petals which open almost flat. These petals are very soft and are daintily waved round the edges. In the centre of the petals rises a big bunch of stamens. In the middle of these stamens stands a curious green horn. This is the seed-vessel, and it is divided at the tip into three little forks.