Seed, seedling, tirodendro morphology and germination of Anadenanthera macrocarpa (Benth.) Brenan (Fabaceae, Mimosoideae)

Sementes, plântulas, morfologia do tirodendro e germinação de Anadenanthera macrocarpa (Benth.) Brenan (Fabaceae,Mimosoideae)

ABSTRACT

The specie Anadenanthera macrocarpa (Benth.) Brenan, angico-vermelho, is little studied regarding the morphological characters of its seeds, seedlings and tirodendo. Therefore, the aims of this study were to describe and illustrate the morphology of seed germination, seedling and tirodendro of angico-vermelho. Seeds of five matrices were harvested and submitted to germination test at 28 °C on paper roll and vermiculite substrates. The seeds are euryspermics with horseshoe-shaped pleurograma and seedlings epigeal-phanerocotylar. The seedling eophylls are compound, bi-pinnate, opposite, oblong-shape laminar and based asymmetric. Petiole has reddish oval gland at the beginning, and two to three rounded glands between the last pinnae. Eophylls and metaphylls have similar morphological characteristics, except for the pinnae number. The tirodendro presents metaphylls compounds bi-pinnate opposite, with gradual hypertrophy of the taproot 27th day after sowing, the xylopodium, that becames larger until 180 days.

Keywords:
angico; biometry; botany; dry forest; xylopodium