NGHIÊN CỨU ĐẶC ĐIỂM HÌNH THÁI, GIẢI PHẪU CỦA LOÀI ĐIÊN ĐIỂN (Sesbania sesban (L.) Merr.) Ở HUYỆN TÂN HƯNG, TỈNH LONG AN

Fabaceae is the second-largest flowering plant family (after Asteraceae), with approximately 17,500–18,000 species across 786 genera, primarily distributed in tropical regions. In Vietnam, over 450 species from 90 genera have been reported, showcasing a rich diversity in habitat and distribution. Many species in this family are valued for their timber, such as Rosewood (Dalbergia cochinchinensis Pierre) and Sua wood (Dalbergia tonkinensis Prain); they also provide medicinal ingredients and food sources like Mung beans (Vigna radiata (L.) R. Wilczek) and Black gram (Vigna mungo (L.) Hepper). This research was conducted to identify the morphological and anatomical characteristics of Sesbania sesban (L.) Merr., a species found in Tan Hung District, Long An Province. Fresh samples of the species were collected and analyzed to describe the morphological features and anatomy of the reproductive and nutrient organs. The study revealed that the stems and leaves of S. sesban exhibit adaptations to high-light conditions, with stomata primarily concentrated on the lower leaf surface, stem hairs that aid in light reflection and moisture retention, and root nodules containing Rhizobium bacteria for nitrogen fixation. The anatomical structure of the nutrient organs showed strong development of pith and wood rings, indicating the adaptation of S. sesban to windy environments near riverbanks and canals.