Ephemers and ephemeroids in adyr, ferghana region

This article indicates the species composition of ephemeral and ephemeroid plants in the flora of the Ferghana Valley according to the Raunker system. Ephemera and ephemeroids, herbs with a short complete development cycle of the whole plant oraerial reproductive and vegetative shoots in the wet period. Ephemers include her baceous annuals whose fulllife cycle takes a very short period of time - from 2 weeks. A characteristic feature of the ephemerais its uniquead aptability to fluctuations in environmental conditions. Ephemeroids are perennial herbs with a repeating cycle of development of aerial shoots, limitedto a wet period. They experience an unfavorable period of drought in the form of underground shoots. Accelerated development occurs due to stock piles of substances that are deposited in the bulbs, rhizomes, corms. There are desert-steppe, foreste phemeroids. Due to the peculiarities of their development alrhythm, desert-step pespecies avoid competiti on for water with typical xerophytes that developin communities some what later.