Soft pine

...The base of the scale leaves on the long branches does not extend downward, so the branch surface is smooth, the leaf sheaths on the short branches fall off early, the tips of the seed scales do not form diamond-shaped scales, and the wings of the seeds do not easily separate. The wood is soft, has little resin, and is pale in color, so it is also called soft pine (white pine). On the other hand, the compound vascular pine is also called the two-needle pine, but there are also species with three, four, or five branches, and two to five branches. ...

*Some of the terminology that mentions "soft pine" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…長枝の鱗片葉の基部が沿下しないため枝面が滑らかで，短枝の葉鞘（ようしよう）は早く脱落し，種鱗の先端はひし形の鱗背をつくらず，種子の翼は離れにくい。材が軟らかくまた樹脂が少なく色も淡いので，軟松類soft pine(white pine)ともいう。一方，複維管束類は二葉松類ともいうが，これにも3本あるいは4,5本，そして2～5本の種がある。…

※「soft pine」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報