Table 1.

The five species of subgenus Strobus used in the study

Species	Subsection*	Source
Pinus bungeana Zucc.	Gerardianae	Institute of Botany, Chinese Academy of Sciences, Beijing, China
Pinus koraiensis Sieb. et Zucc.	Cembrae	Changbai Mountain, Jilin, China
Pinus armandii Franch.	Strobi	Shengnongjia, Hubei, China
Pinus wallichiana Jackson.	Strobi	Yadong, Tibet, China
Pinus strobus L.	Strobi	North Carolina State University, NC, USA

^*The taxonomic system of Little and Critchfield (1969) is followed.