XVI International Botanical Congess

Seedlings of herbaceous and woody species of 7 series of 2 sections of Mimosa are compared. The highest germination percentages of scarified seeds were obtained on the second day after sowing. Laboratory grown seedlings are phaneroepigeal, and have stipulated, widely oblong to orbicular cotyledons with 3-5 main veins. On the first stage, radicule is straight, hypocotyl develops quickly, and epicotyl is reduced to the plumule, while the cotyledons expand. On the second stage, the epicotyl lengthens and the first paripinnate eophyll develops, form and number of leaflets vary in each species. On the third stage, the second paripinnate eophyll develops in the woody species, or the first biparipinnate metaphyll appears in the herbaceous ones. A taproot system is developed.