Please be patient during our upgrade, thank you. Acidity is an indication of the absence of lime or other alkaline material. Compare dormancy and rest period Aerial roots- Roots that arise in the air, from stems not necessarily in contact with a surface. Aerial roots are often capable of clinging to trees and other supports, and they can usually absorb moisture from the air.
Alkalinity can be an indication of the presence of lime.
The opposite of acid. Refers to the placement of leaves on a stem. Alternate leaves are borne singly at different heights, more or less alternating from one side of the stem to the other. A plant that grows from seed to flower and seed production and then dies within a single growing season. Compare biennial and perennial.