Ephemeroids

Ephemeroids

 

a group of perennial herbaceous plants for which fall-winter-spring vegetation is common. During the dry season the plants remain dormant in the form of seeds, bulbs, tubers, or rhizomes. The vegetative period of ephemeroids in arid zones (tulips, sedge, meadow grass) is two to eight months. Optimum growth occurs in the spring. Ephemeroids are important as pasturage in Middle Asia and Kazakhstan. The vegetative period of ephemeroids in the forest-steppe region (squill, buttercup anemone) is two months, lasting usually until the formation of leaves on trees. Flowering and fruit formation make up a large part of the vegetative period. Many species flower until the onset of leaf formation.

References in periodicals archive ?
There are also ephemeroids, plants with underground perennating organs that complete their growth cycle when the environmental conditions are favorable.
Ephemerals and ephemeroids are plants that are well adapted to life in the deserts and to dry summers.
The temperate deserts have a large variety of spring ephemeroids with underground storage organs.
The large umbellifers of the genera Ferula and Dorema are typical monocarpic ephemeroids.
Another species of ephemeroid is Zygophyllum [=Miltianthus] portulacoides, which grows in the gypsum deserts and has similar tuberlike roots and greatly reduced petals.
Orchids are very infrequent in deserts, but in the tokay of the Turan lowland, Afghanistan, and Iran, there is a rhizomatomous ephemeroid orchid, Zeuxine strateumatica, whose shoots have a very short growing cycle (45-50 days).
Many parasitic species such as the species of Cistanche (Orobanchaceae) are also characterized by an ephemeroid growth-form.
Some of these ephemeroid grasses hardly ever produce any seeds and instead reproduce vegetatively or by viviparity, forming bulbils within the inflorescences or in the leaf axils.
Thus, the zones the herds graze in spring are rich in ephemeroids, while in winter they move to sites dominated by artemisias, as these typical desert plants tend to reach their greatest size in the autumn.