The stalk of an inflorescence. Penicillin

The antibiotic obtained from the fungus Penicillium. This antibiotic is an example of an unstable protection mechanism. Pennisetum clandestinum

Kikuyu grass. A fodder grass from Kenya that is now widespread throughout the tropics. Pennisetum purpureum

Elephant grass, also known as Napier grass. This grass is so-called because it grows tall enough to hide an African elephant. It occurs wild in the general area of Uganda. It is a highly productive fodder, and it provides an excellent mulch. It is usually propagated by stem cuttings of 3-4 nodes. Seed is produced abundantly but is difficult to collect. An appropriate target for a small local breeding club. Pennisetum typhoides

Pearl millet, also known as bulrush millet, spiked millet, and cat-tail millet, and as bajra in India. This is an ancient crop and the most important of all the millets. It originated in Africa but was taken to India at an early date. Its value lies in its tolerance of poor soils and low rainfall. The plant is open-pollinated and exhibits extreme variation. An attempt to produce hybrid varieties in India was highly successful until the breakdown of vertical resistance to downy mildew (Sclerospora graminicola). A suitable crop for amateur breeders who should aim at horizontal resistance and purely local requirements. Pentaploid

A plant with five sets of chromosomes. Pentaploids are usually sterile.

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