The leaves of the involucre are spiny in thistles and in teazel (Dipsacus), and hooked in burdock.
9) and teazel.
In the American button-bush the heads are globular, in some species of teazel elliptical, while in scabious and in composite plants, as sunflower, dandelion, thistle, centaury and marigold, they are somewhat hemispherical, with a flattened, slightly hollowed, or convex disk.
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