(i 9 o) 



And as to the plates, I stated that they are excellent. They 

 are so as far as the drawing, engraving and printing are con- 

 cerned. For the deficiencies that are to be found in them 

 the botanist alone is responsible. The confusion of species 

 in his mind is shown in the selection of material for the illus- 

 trations. Take for an example the plate of J^. undulata 

 (PL 385). Anyone can see that the figures there given 

 represent more than one species. In fact, leaves of not less 

 than six species are there illustrated, and not one of these is 

 J^. undulata Torr., unless Fig. 4 is meant to represent it. 

 This figure, however, does not give a good illustration of the 

 typical form ; if this is interpreted as J^. undulata it makes 

 the seventh species illustrated on the plate.* 



Jguercus Gambelii has in the Silva the following syno- 

 nyms : J^. Gambelii Nutt., j£. alba $? Gunnisonii Torr., 

 j£. stcllata o Utahcnsis A. DC, 4>. Douglasii ft? Gam- 

 belii A. DC, J^. Douglasii y Novomexicana A. DC, „£. 

 undulata Wats., J£. undulata a Gambelii Engelm., j£. Gam- 

 belii var. Gunnisonii Wenzig, and J^. venustula Greene. Let 

 us see what they represent. 



Jgitercus Gambelii Nutt.f was based on specimens col- 

 lected on the Rio del Norte by Gambel, the exact locality is not 

 stated. It is described as follows : " Leaves obovate, shortly 

 petioled, narrowed below, sinuately lobed, dilated and some- 

 what 3-lobed at the summit, beneath pubescent, the lobes 

 rather obtuse, the upper subdentate ; fruit sessile, small, the 

 cup hemispherical, scales ovate-acute; the glands ovate and 

 acute, about half immersed in the cup ; the conic summit 

 short." 



The oak that I take to be typical, and the only one that has 

 an acute acorn, half immersed in the cup, and "sinuately 

 lobed " leaves is not the most common one of the J%_. Gambelii 

 series. It is found, as far as I know, only in Colorado and 

 New Mexico, and was collected by Mr. Vreeland and myself 



* These are: Q. undulata Torr. (?)/. 1,4; Q. pungens Liebm./ 5; Q. 

 Fendleri Liebm./ 6-S ; Q. grisea Liebm. /. 9 ; Q. turbineUa Greene,/. 10- 

 12 ; Q. undulata var. obtusifolia A. DC. / 13 ; Q. venustula Greene,/ //. 



t Journ. Phil. Acad. II. 2 : 179. 1848. 



