Nutation (botany) flowers to open or close by movements which resemble the simple nutation of dorsiventral organs. Thus, the tulip, crocus, and other vernal flowers are very sensitive to changes in temperature. The crocus can perceive a change of 0.5°C (0.9°F), and will respond to a change of 20°C (36°F) in two minutes. Nutation (botany) Nutation is the bending movements executed by some plant organs, such as stems, leaves, roots, etc., by which the part is inclined successively in various directions. Nutations are due to the unequal rate of growth of different sides of the organ, an inequality which, so far as
Botany 2000 the newsletter, the UNESCO Botany 2000-Asia program sponsors occasional workshops on the taxonomy, ethnobotany and chemistry of various plant families, as well as training courses in herbarium techniques and curation. Botany 2000-Africa is implemented by UNESCO's Nairobi Office and deals with the conservation and use of the medicinal flora of Africa. Some of the activities of the Botany 2000-Africa program are published in: S. Edwards and Z. Asfaw (Editors): "The Status of Some Plant Resources in Parts of Tropical Africa". Botany 2000: East and Central Africa; NAPRECA Monograph Series No. 2. Published by "Natural Products Research Network for Eastern and