Ephemers and ephemeroids in a dyr 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 or aerialre productive and vegetative shoots in the wet period. Ephemers include herb aceousannuals whose fulllife cycle takes a very short period of time - from 2 weeks. A characteristic feature of the ephemeraisits unique adaptability to fluctuations in environmental conditions. Ephemeroids are perennial herbs with a repeating cycle of development of aerial shoots, limited to a wet period. They experience anun favorable period of drought in the form of underground shoots. Accelerated development occursdue to stock piles of substances that are deposited in the bulbs, rhizomes, corms. There are desert-steppe, forest ephemeroids. Due to the peculiarities of their developmental rhythm, desert-step pespecies avoid competition for water with typical xerophy test hat develop incommunities some what later.