The paper presents comparative-morphological analysis of biomorphs Limosella aquatica L., stolon-rosette perennial mesophyte grasses (Viola odorata L.), and yearling vegetative hydrophytes (Stratiotes aloides L. and Hydrocharis morsus-ranae L.). It is shown that L. aquatica is a monopodial growing monocarpic with side stolon-rosette shoots and their systems with up to four branching orders. The primary shoot, as well as rosette parts of stolon-rosette shoots, is made of metamers with foliage leafs, axil complexes with differently sets of constituents: two collateral buds and/or their derivatives: flower buds/flowers/fruit, side stolon-rosette shoots or their systems. At the initial stage the shoot-forming mode of L. aquatica is similar to that of V. odorata: a monopodial rosette one with green assimilating leaves, flowers, and stolon-rosette shoots. But iterative branching of stolon-rosette shoots changes the shoot-forming mode of L. aquatica to a sympodial semirosette as in S. aloides, and especially in H. morsus-ranae. Biomorph L. aquatica combines the features of stolon-rosette perennial mesophyte grasses and stolon-rosette yearling vegetative hydrophytes: stolon-rosette shoot formation from axil buds, iterative branching, collateral buds, reduction inflorescence to one flower (S. aloides). Thus of habit L. aquatica can be viewed as a stage of perennial flower mesophyte plants’ shifting to life in water.
The authors of the article have evaluated the state and structure of coenopopulations of nemoral species using the example of Convallaria majalis L. and Polygonatum odoratum (Mill.) Druce. Three cenopopulations of P. odoratum (CPP.1 – CPP.3) and four of C. majalis (CPC.4 - CPC.7) have been described while studying three quarters of the Medvedsky Bor nature sanctuary. The authors have come to the conclusion that all the studied coenopopulations of P. odoratum and C. majalis were normal juvenile incomplete. Due to the high demand of C. majalis and P. odoratum in soil moisture, their existence in the pine communities of the Medvedsky Bor nature sanctuary is ensured by the presence of green mosses that retain moisture on the substrate surface.
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