1. Weeds which bear fruit of a downy or wingy nature;

2. Sagebrush, chaparral, and any other brush or weeds which attain such large growth as to become, when dry, a fire menace to adjacent improved property;

3. Weeds which are otherwise noxious or dangerous;

4. Poison oak and poison ivy when the conditions of growth are such as to constitute a menace to the public health;

5. Dry grass, stubble, brush, litter, or other flammable material which endangers the public safety by creating a fire hazard.