coenopopulation

REPRODUCTIVE BIOLOGY OF CYPRIPEDIUM GUTTATUM SW. (ORCHIDACEAE, MONOCOTYLEDONES) AT THE NORTHERN BORDER OF ITS HABITAT

Authors: Kirillova I. A., Pestov S. V., Kirillov D. V.

The paper presents data on the reproductive biology of Cypripedium guttatum Sw. (Orchidaceae) in the Komi Republic, at the northern border of its habitat. Bees (Lasioglossum calceatum and L. brevicorne) are pollinators of C. guttatum in the region. The pollination efficiency is 21%. C. guttatum seeds are the largest ones among those of other orchid species in the region (1.11×0.22 mm). The size of seeds depends on the growing conditions of mother plants. The seed productivity of C.

ECOLOGICAL-PHYTOCENOTIC ASSESSMENT OF THE POPULATION STATUS OF THE RARE SPECIES DICTAMNUS GYMNOSTYLIS STEV. (RUTACEAE, MAGNOLIOPSIDA) IN THE SOUTHERN URALS

Authors: Abramova L. M., Mustafina A. N.

The results of our ecological-phytocenotic assessment of the natural coenopopulations of the rare (in Bashkortostan Republic) species Dictamnus gymnostylis Steven are given. In the Southern Urals, the species is on the northeastern border of its habitat. The ontogenetic, demographic and vitality structures of 20 coenopopulations were studied, the existence optima were found. The majority of the surveyed coenopopulations of D. gymnostylis have densities within 1 - 10 ind./sq.m and an incomplete ontogenetic spectrum, the basic ontogenetic spectrum being centered.