Diaspores are common in weedy and ruderal species. Trees are mostly allochtoonous and typical for the ruderal habitats. These occur in a variety of weedy and ruderal species native to steppes and deserts. Certain classes of weeds share adaptations to ruderal environments. Reliance upon wind dispersal is common among many weedy or ruderal species. Reliance on wind dispersal is common among many weedy or ruderal species. Some of them are ruderal species. Nowadays it is quite common in roadsides and ruderal habitats, even in urban areas. The three strategies are competitor, stress tolerator, and ruderal. Many tumbleweeds are ruderal species, opportunistic agricultural weeds. "Kali tragus" is a ruderal annual forb. Twoleaf nightshades are ruderal species, colonizing newly disturbed lands. It grows in ruderal places, as well as dry pastures and disturbed fields. Some species can be found in ruderal sites and salt marshes up to subalpine altitudes. "Syngonium" species generally inhabit tropical rainforests, subtropical forests, ruderal areas, thickets, urban areas, and wetlands.