The criterion level, often abbreviated as Lc, is the steady noise level permitted for a full eight-hour work shift. This is 85 dB(A) in most jurisdictions, but it is 90 dB(A) in Quebec and 87 dB(A) for organizations that follow the Canadian federal noise regulations.
Royal Catchfly (Silene regia) This striking plant may grow as high as five feet, with bright red flowers. It flowers from May through September, and can be seen in remnant prairies and open woods. In Missouri, it is known only in the Ozarks.
The Ozark Swallowtail looks exactly like the Black Swallowtail. It can only be separated by habitat and host plant choices (the host plant is the plant that the caterpillar feeds on). It is found in woodlands. The host plants are Meadow Parsnip (Thaspium barbinode) and Yellow Pimpernal (Taenidia intregerrima).