TREES AND SHRUBS 49 



species to subspecific rank only temporarily, for lack of suf- 

 ficient data. The plant is a rather large tree when grown 

 under the best conditions, is found only in the mountains or 

 their foothills at an elevation of 1500 to 2,000 feet higher than 

 the habitat of the other species. The trunk of this tree is not 

 infrequently 18 inches or more in diameter and from 6 to 10 

 feet high, though it sometimes branches nearer the ground. 

 The leaflets are considerably larger and broader and have a 

 serrate margin. This species has also been confused with a 

 Calif ornian one, but we are informed by those who have seen 

 both gowing that they are amply distinct. 



Nuts of what is probably another species have been 

 brought to us from the Mogollon region, but we are unable 

 to determine the species from the material received, and have 

 not seen the plant growing. The nuts in question were almost 

 twice as large as those of either of the other species. The 

 plant is a good sized tree. Further observation and collection 

 will be necessary to determine this species. 



The Black Walnut (Juglans nigra) of the Eastern States 

 has been cultivated successfully in a few places in the State. 

 Experience at the Experiment Station has shown that walnuts 

 grow rather readily from seed and make good shade trees in 

 the irrigated valleys of the southern part of the State. It 

 is altogether probable that they will grow at almost any level, 

 if supplied with sufficient water. 



JUGLANS L. Walnut 



Strong- scented tress or shrubs; buds few scaled or naked; 

 flowers in simple pendulous catkins from the wood of the previous 

 year: calyx 3 to 6-cleft: stamens 12 to 40 on short filaments; styles 

 2. short; fruit drupaceous, the exocarp fibrous-fleshy, indehiscent; 

 the enuocarp an irregularly roughened "nut" with an edible embryo. 



Large shrub 12 to 18 feet high: branching 

 from the ground, rarely if ever with a no- 

 ticeable trunk. 1. J. rupestris. 



Tree 25 feet tall or more, with a trunk often 



10 feet high and 12 to 18 inches in diameter. ?. ■/. major. 



