However the wood is omitted from this list for two main reasons.
The softest hardwood.
A hardwood named quipo cavanillesia platanifolia is commonly reported as the softest known wood with an alleged janka hardness of 22 lb f 98 n.
And while this example lists just some of the most popular hardwood species there are hundreds of varieties representing the north american hardwood population.
On a hardness scale alder ranks just above pine and poplar.
The hardest commercially available hardwood is hickory and it is five times harder than aspen one of the soft hardwoods.
Other soft hardwoods.
For example balsa wood is known as one of the softest and least dense types of wood yet it is categorized as hardwood.
Wood is categorized as either softwood or hardwood based on physical structure and makeup.
This happens to be generally true but there are exceptions such as in the cases of wood from yew trees a softwood that is relatively hard and wood from balsa trees a.
Because hardness is an important factor and hardness.
Similarly wood from the yew tree which is one of the toughest woods and is harder than most types of oak is classified as softwood.