Seed are sometimes sold commercially while still enclosed within the hard wall of the fruit, which must be split open to reach the seed. Different groups of plants have other modifications, the so-called stone fruits (such as the peach) have a hardened fruit layer (the endocarp) fused to and surrounding the actual seed. Nuts are the one-seeded, hard-shelled fruit of some plants with an indehiscent seed, such as an acorn or hazelnut. Seeds are produced in several related groups of plants, and their manner of production distinguishes the angiosperms ("enclosed seeds") from the gymnosperms ("naked seeds"). Angiosperm seeds are produced in
Lapeirousia lobes may be subequal and spreading, or unequal with upper largest petals erect, the lower three forming a lip. The stamens are symmetrically arranged. The fruit is a membranous capsule containing many small seeds, either globose or angled by pressure. Some forty species have been described from sub-Saharan Africa, of which about a third are endemic to fynbos. Common names are various and regional, including "painted petals", "cabong", "chabi", "" (Afrikaans for "wheat flower"). The flowers are commonly scented, though possibly only at certain times of day. The plants are of considerable biological and evolutionary interest because of their adaptions