They are a deciduous tall tree that bears needle-like leaves. The trunk grows to be about 1.2 m wide, and is often planted for garden trees and windbreak forests. Cortex is tinged with red, therefore, they are named ‘Pinus densiflora’ (Akamatsu). Though they look like Pinus thunbergii Parlatore (Kuromatsu) in the same group of Pinaceae, the leaves of Akamatsu are rather thin and soft. This fact results in calling Kuromatsu by ‘male pine tree’ and Akamatsu by ‘female pine tree’. They survive to grow even at arid and poor soil to grow wild along the ridge of a plateau located around 2,000 m above sea level. Decades ago, we used to see Akamatsu even at Mt. Takao, but nowadays we seldom see them. The blossom seasons are about April to May and hermaphroditism plant (Shiyuudousyu). Yellow male flowers sprout on a new branch, while 2 to 3 of purple-red female flowers sprout at the limb of the branch. The seeds are egged-shaped and get matured next autumn to be woodsy pinecone (Matsu-bokkuri).

●Height about 25 to 40 m
●Place Near streamside