There were 19 illustrations found for G. Hansen

2 859519 Quercus engelmannii Greene
E.L. Greene, Ill. W. Amer. Oaks: t. 9, fig. 3 (1889) [G. Hansen]

2 859413 Quercus douglasii Hook. & Arn.
E.L. Greene, Ill. W. Amer. Oaks: t. 12, fig. 4,5 (1889) [G. Hansen]

1 862509 Quercus undulata Torrey
E.L. Greene, Ill. W. Amer. Oaks: t. 13, fig. 3,4 (1889) [G. Hansen]

2 859519 Quercus engelmannii Greene
E.L. Greene, Ill. W. Amer. Oaks: t. 15, fig. 2,3 (1889) [G. Hansen]

2 861113 Quercus palmeri Engelm.
E.L. Greene, Ill. W. Amer. Oaks: t. 25 (1889) [G. Hansen]

1 862398 Quercus tomentella Engelm.
E.L. Greene, Ill. W. Amer. Oaks: t. 26 (1889) [G. Hansen]

2 862490 Quercus turbinella Greene
E.L. Greene, Ill. W. Amer. Oaks: t. 27 (1889) [G. Hansen]

58 861098 Quercus pacifica Nixon & C.H.Müll.
E.L. Greene, Ill. W. Amer. Oaks: t. 28 (1889) [G. Hansen]

58 859428 Quercus dumosa Nutt.
E.L. Greene, Ill. W. Amer. Oaks: t. 29, fig. 1 (1889) [G. Hansen]

Quercus sp.
E.L. Greene, Ill. W. Amer. Oaks: t. 29, fig. 2 (1889) [G. Hansen]

1 862509 Quercus undulata Torrey
E.L. Greene, Ill. W. Amer. Oaks: t. 30 (1889) [G. Hansen]

6 862509 Quercus undulata Torrey
E.L. Greene, Ill. W. Amer. Oaks: t. 31 (1889) [G. Hansen]

6 862509 Quercus undulata Torrey
E.L. Greene, Ill. W. Amer. Oaks: t. 32 (1889) [G. Hansen]

1 859708 Quercus gambelii Nutt.
E.L. Greene, Ill. W. Amer. Oaks: t. 33 (1889) [G. Hansen]

2 860668 Quercus macdonaldii Greene & Kellogg
E.L. Greene, Ill. W. Amer. Oaks: t. 34 (1889) [G. Hansen]

12 859719 Quercus garryana Douglas ex Hook.
E.L. Greene, Ill. W. Amer. Oaks: t. 35 (1889) [G. Hansen]

12 859719 Quercus garryana Douglas ex Hook.
E.L. Greene, Ill. W. Amer. Oaks: t. 36, fig. 1 (1889) [G. Hansen]

2 859719 Quercus garryana Douglas ex Hook.
E.L. Greene, Ill. W. Amer. Oaks: t. 36, fig. 2 (1889) [G. Hansen]

2 1268668 Quercus gilberti Greene
E.L. Greene, Ill. W. Amer. Oaks: t. 37 (1889) [G. Hansen]