Overview of Cruciferae
- These are annual herbs.
- The leaves are radical and cauline, simple, alternate, often lobed, or rarely pinnately compound.
- A raceme (corymbose towards the top).
- The flowers are regular and cruciform, bisexual, and completely hypogynous.
- They are sepals, 2+2, which are free, and in two whorls.
- There are four petals, free, in one whorl. They alternate with the sepals. They are cruciform. Each petal has a distinct limb and claw.
- There are six stamens in two whorls, two short, outer ones and four long, inner ones (tetradynamous).
- There are two syncarpous carpels. The ovary is superior, at first one-celled, but later two-celled owing to the development of a false septum. There are often many ovules in each cell, sometimes only two. They are anatropous or campylotropous. The placentation is parietal.
- The fruit is a long, narrow siliqua or a short, broad silicula.
- These are exalbuminous. The embryo is curved. The seeds remain attached to a wiry framework, called the replum, which surrounds the fruit.
Examples: Black mustard (Brassica nigra).
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