Penstemon digitalis which repeat with two flowers multiple times. The pedicels are almost one fourth of an inch long and produce 1.25 inch long two-lipped tubular flowers over dark green foliage. The plant has elliptic basal leaves and lance-shaped to oblong stem leaves. It is called beardtongue because the plant has a fifth stamen which resembles a hairy beard due to having small hairs. "Penstemon" is a combination of the Greek words, "penta", "five" and "stemon", referring to the stamen, every flower containing five stamens. Four of the stamens are fertile while the fifth one is sterile. The Latin word "digitalis" means
Chemical plant workers typically include engineers, plant operators, and maintenance technicians. Other personnel at the site could include chemists, management/administration and office workers. Types of engineers involved in operations or maintenance may include chemical process engineers, mechanical engineers for maintaining mechanical equipment, and electrical/computer engineers for electrical or computer equipment. Large quantities of fluid feedstock or product may enter or leave a plant by pipeline, railroad tank car, or tanker truck. For example, petroleum commonly comes to a refinery by pipeline. Pipelines can also carry petrochemical feedstock from a refinery to a nearby petrochemical plant. Natural gas is a product which comes