FEATURES OF ULTRASCULPTURE OF SPERMODERM SEEDS OF REPRESENTATIVES OF THE GENUS PYCNANTHEMUM MICHX. (LAMIACEAE LINDL.)

Abstract

The result of the introduction of any type of plant is the final comprehensive
assessment, which is based on the results of a number of studies, the main place
among which occupy morphological. Changes in the morphology of organs that plants
can acquire after introducing in new growth conditions characterize the adaptive
potential and lability of the species, and static characteristics - help in taxonomic
identification.The article presents the results of a comparative study of seeds (erems)
of 2 species of the genus Pycnanthemum Michx. (Lamiaceae Lindl.): Pycnanthemum
tenuifolium Schrad. and P. virginianum (L.) T. Durand & B.D. Jacks ex B.L. Rob &
Fernald, introduced in the M.M. Gryshko National Botanical Garden National
Academy of Sciences of Ukraine (Right Bank Forest-Steppe). As for Ukraine,
Pycnanthemum is a new representative of the cultural flora, in the context of
morphological studies, the features of ultrasculpture of spermoderm of the seed are
revealed, since its features are considered constant and taxonomically significant, and
information on this issue has not been revealed. he result of the research is the
description and photocopied documented morphological features of the hens of two
species of the genus Pycnanthemum: P. tenuifolium and P. virginianum, introduced in
the conditions of the National Botanic Garden. MM Grishko National Academy of
Sciences of Ukraine (Right Bank Forest-steppe).It was found that the seeds of these
species are quite small and have a different type of relief. For the seeds P. tenuifolium
is characterized by roundness, combined relief, U-shaped bend of the scar, whereas
the P. virginianum seeds are indistinctly sculptural spermoderm, sharp longitudinal
faces, V-shaped bend of the scar. Presented descriptions are important as auxiliary
taxonomic features for the species identification of introducers of this genus.
Keywords: introduction, genus Pycnanthemum, ultrasculpture, seeds, sign,
spermoderm.