### plant | tracheophyte | tree:

Willow
* All willows are dioecious, producing male or female catkins on separate trees
  - fast growing and short-lived, and their wood is notably weak and prone to breaking
  - have simple leaves that are alternately arranged on spindly stems
  - produce salacin, a chemical related to aspirin
* All willows produce salacin, which is closely related chemically to aspirin
  - closely related to aspirin
* Most willows adapt to conditions
  - harsh conditions
* Most willows grow in habitats
  - wet habitats
* Most willows have branches
  - brittle limbs
* Most willows have different fiber length
* Most willows have shallow roots
  - surface roots
  - thin branches
* Most willows produce disperse seeds
  - foliage
* Some willows absorb energy
  - magical energy
  - contain substances
* Some willows grow in shallow water
  - have bunches of flowers that are usually white
* Some willows produce catkins
  - flower catkins
  - pink flowers
  - survive for years
* WIllows come in all shapes and sizes, from large trees to bushy shrubs.
* also depend on the dispersal of their seeds.
* are a home to many critters, and leaves and twigs are an important browse
  - host for the carrot aphid, which pest of carrots, parsnips and celery
  - staple year-round food for moose
  - strong and flexible material
  - very large and diverse group of trees
  - abundant nearly everywhere
* are among the most abundant small trees in Greater Yellowstone
  - common woody plants found in riparian areas
  - an important food source, and moose also feed on submerged aquatic plants
* are common along watercourses and in seep areas
  - shrubs and small trees in the northern boreal and subarctic areas
  - extremely hardy and tend to take root and grow very easily
  - important moose and ptarmigan feed
  - invasive so in some areas they are prevented from encroaching
  - notorious for their rooting abilities
  - pioneer, sun loving trees that are the first to become established on sand bars
  - plant pioneers, able to live on raw new soil wherever there is water
  - problem prone plants that require more care than other trees
  - problem-prone plants that often require more care than other shrubs
* are problem-prone plants that require more care than other shrubs
* are the best for making wreaths and swags
  - tallest of any species in the alpine tundra
  - very easy to grow and love moist soil in full sun
* contains salicin.
* do have a reputation of helping other plants root.
* do well in wet locations, such as playa lakes
  - on moist, well drained soils and tolerate flooding for up to three weeks a year
* droop along one edge, drinking their fill when the days turn too hot.
  - on moist, lowland sites and in the many brushy draws draining the side slopes
* grows everywhere and favorite food for moose who are often seen on the road eating it.
  - medicinal effects internally
  - the potential to spread rapidly along Victorian waterways
* includes bark
  - cell membranes
  - cells
  - corpi
  - cytoplasm
  - leaf nodes
  - nuclei
  - plasma membranes
  - sections
  - stumps
  - tree branches
  - treetops
  - trunks
  - vacuoles
  - xylem
* like to grow beside or even in the water.
* looks like grayish and brown tree bark.
* occur in moist areas, especially along stream banks.
* perform poorly in dry areas.
  - large volumes of seeds each spring after the blooming phase
* provide wildlife with food and excellent shelter.
* reproduce more easily than any other tree.
* require moist soil.
* vary greatly in susceptibility
  - the concentrations of salicyl glucosides in their leaves