Springthorn ( 牝 1889 栗毛 Morgan )
 |-- Go On ( 牝 1895 栗毛 Isosceles )
 |   `-- Polar Star ( 牡 1904 栗毛 Pioneer )
 |-- Spring Chicken ( 牝 1904 栗毛 Gallinule )
 |   |-- Yokohama ( 牝 1911 鹿毛 Santoi )
 |   |   |-- Royal Yoke ( 牝 1917 芦毛 Roi Herode )
 |   |   |-- San-Utar ( 牡 1921 栗毛 Sunder )
 |   |   `-- Yam ( 牝 1922 黒鹿毛 Hapsburg )
 |   |-- Spring Thyme ( 牡 1912 鹿毛 Spearmint )
 |   |-- Scaramuccia ( 牝 1916 栗毛 Spearmint )
 |   |   `-- Scarborough ( 牝 1924 黒鹿毛 Bridge of Earn )
 |   |-- Scuola d'Atene ( 牝 1917 鹿毛 Bayardo )
 |   |   |-- Scuola Genovese ( 牝 1924 鹿毛 Galloper Light )
 |   |   `-- Sanzio ( 牡 1928 鹿毛 Papyrus )
 |   |-- Scopas ( 牡 1919 鹿毛 Sunstar )
 |   |-- Scarsellino ( 牡 1920 黒鹿毛 Signorino )
 |   `-- Scopello ( 牡 1923 鹿毛 Havresac )
 `-- Shrike ( 牝 1905 鹿毛 Gallinule )
 |   `-- Gaba Tepe ( 牝 1914 鹿毛 St. Frusquin )
 |   |   `-- Miss Meadowes ( 牝 1921 鹿毛 Black Jester )