Abstract
Lepidium subcordatum Botsch. et Vved. (Brassicaceae) is a rare endemic species of relict mountains of the Kyzylkum desert. The plant is listed in the “Red Data Book of Uzbekistan”. It grows on stony and rocky slopes of relict mountains. The ontogenetic structure of five coenotypical populations of this taxa growing in the Kuldzhuktau and Auminzatau mountains had been revealed. The ontogenesis duration is more than 20 years in natural habitats. All investigated coenopopulations can be assessed as normal and incomplete. The typical spectrum of coenopopulations is centralized with a peak in the middle-generative individuals. The ontogenetic spectrum of the most studied coenopopulations coincides with the characteristic ontogenetic structure that indicates a favorable environmental condition in region for self-maintenance of L. subcordatum coenopopulations.
Highlights
The genus Lepidium L. is one of the largest genera of the Brassicaceae consisting of 175 species
The ontogenetic spectrum of the most studied coenopopulations coincides with the characteristic ontogenetic structure that indicates a favorable environmental condition in region for self-maintenance of L. subcordatum coenopopulations
The ontogenesis of present species has been described during the field studies in the Kyzylkum desert (Figure 3)
Summary
The genus Lepidium L. is one of the largest genera of the Brassicaceae consisting of 175 species. It is distributed worldwide, primarily in temperate and subtropical regions; the genus is poorly represented in Arctic climates, and in tropical areas it grows in the mountains. In Uzbekistan, there are found only 10 species [3]. The most species of Lepidium in Uzbekistan have a wide environmental range. They grow on saline and solonetz of deserts, on river valleys, on fine-grained slopes of low mountains and in the rock crevices at the middle mountain belt. There were attempts to introduce some species of Lepidium into the culture under desert conditions due to their rather soft shoots among numerous rough-stemmed desert shrubs [5]
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