These doctors work with deaf and mute children to assist in their learning to communicate. They typically work in hospitals, physiciansâ offices, audiology clinics, and occasionally in schools. 2. Allergists work with a wide variety of patients who suffer from issues related to allergies, such as hay, fever, or asthma.
Japanese Knotweed is an aggressive semi-woody perennial plant that is native to eastern Asia. In the 1800's it was introduced to North America as an ornamental species and also planted for erosion control.It has since spread throughout the United States and Canada.mpacts of Japanese Knotweed. 1  Spreads quickly, creating dense thickets that degrade wildlife habitats. 2  Reduces plant biodiversity by competing with other native vegetation. 3  Aggressive plant with a strong root system that has been known to break through asphalt and concrete. 4  Plant populations are extremely persistent. 5  It can establish along ...
Pennsylvania smartweed (Persicaria pensylvanica / Polygonum pensylvanicum), which is native to Alaska and grows in the Pacific Maritime ecogeographic region, can be distinguished from spotted ladysthumb and curlytop knotweed by a combination of characteristics listed in Table 1 below.Gray.eeds are lens-shaped to three-angled, black, smooth, and shiny (Welsh 1974). Persicaria maculosa Similar species: Spotted ladysthumb can be distinguished from curlytop knotweed by the presence of stiff hairs that are up to 3.5 mm long on the margins of the leaf sheathes and erect spikes with deep pink flowers.