Subjects: Biology >> Botany >> Applied botany submitted time 2023-07-13 Cooperative journals: 《广西植物》
Abstract： The genus Habenaria exhibits a highly diversity in floral morphology and has complex taxonomy problems. In order to identify key taxonomic features of this genus, floral structure and column ultrastructure of Habenaria dentata and Habenaria glaucifolia were investigated using the stereo microscope and scanning electronic microscope (SEM). The results were as follows: (1) The two Habenaria species exhibited significant differences in floral structures, specifically in terms of the presence or absence of lateral petal lobes, the morphology of the 3-lobed lip, and the ratio of the length between the spur and the ovary. (2) The column ultramicro characteristics of two Habenaria species were significantly varied, containing morphology of staminode, anther chamber exine cell, “anther-canal” exine cell, elongated stigma and papilla at the junction with style. (3) Exine sculptures of massula were distinguished in two species, the reticulate type in Habenaria dentata, and the baculate → reticulate type in Habenaria glaucifolia. This study investigates the taxonomic implications of floral features and column ultrastructure in Habenaria species, with a specific focus on the examination of Habenaria glaucifolia. Through the analysis of available data, certain selected features were identified as potentially valuable for species delimitation, including the presence or absence of lateral petal lobes, variations in spur morphology, the length ratio of the spur to the ovary, and the types of pollen exine sculpture. Additionally, the floral structure and column ultrastructure of Habenaria glaucifolia were supplemented and thoroughly analyzed based on reported data. Notably, it was not confirmed that Habenaria glaucifolia should not be treated as an independent genus from Habenaria. The results of this study provide novel insights and serve as a valuable reference for the classification of Habenaria species distributed in Asia.
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