1 The sun's rays are strongest during the hours of 10 a.m. to 4 p.m. The sun's rays are also stronger at higher altitudes and lower latitudes (closer to the tropics). Reflection off water, sand, or snow can make the sun's burning rays stronger.  Sun lamps can cause severe sunburn.
Marchantia polymorpha, sometimes known as the common liverwort or umbrella liverwort, is a large liverwort with a wide distribution around the world. It is variable in appearance and has several subspecies.
Verbascum blattaria. Verbascum blattaria, or moth mullein, is a flowering biennial weed belonging to the Scrophulariaceae (figwort) family. An invasive species native to Eurasia and North Africa, it has naturalized in the United States and most of Canada since its introduction. It has been declared a noxious weed by the state of Colorado.