162 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



1. JTTGLANS L. Walnut. 



Strong-scented trees or shrubs; buds few-scaled or naked; flowers in simple pendu- 

 lous catkins from the branches of the previous year; calyx 3 to 6-cleft; stamens 12 to 40, 

 with short filaments; styles 2, short; fruit drupaceous, the exocarp fibrous-fleshy, 

 indehiscent, the endocarp and irregularly roughened "nut" with an edible embryo. 



There are at least two species of Juglans in New Mexico and possibly a third. The 

 two do not occur together so far as any records show or as we know. The small bushy 

 species occurs only in the southeastern part of the State in the Lower Sonoran Zone, 

 while the tree grows in the mountains, mostly in the Transition or just at the top of the' 

 Upper Sonoran Zone. Mr. 0. B. Metcalfe once collected some nuts from a tree in the 

 mountains of the western part of the State which were much larger than those of 

 either of the species mentioned here. These were not accompanied by any other 

 material, so that we are unable to characterize the species. 



KEY TO THE SPECIES. 



Large shrub 4 to 6 meters high, branching from the ground, rarely if 



ever with a noticeable trunk 1. J. rupestris. 



Tree 8 meters high or more, with a trunk often 3 meters high and 30 to 



50 cm. in diameter 2. J. major. 



1. Juglans rupestris Engelm. in Sitgreaves, Rep. Zuni & Colo. 171. /. 15. 1854. 

 Type locality: "New Mexico." 



Range: Western Texas and southeastern New Mexico. 



New Mexico: Guadalupe Mountains; east slope of the Sacramento Mountains; 

 Pecos Valley. Along streams, in the Lower Sonoran Zone. 



This walnut is a large branching shrub, in New Mexico usually less than 5 meters 

 high, with several stems from one root, branched down to the ground. It is not uncom- 

 mon along the Pecos and its tributaries in the southeastern part of the State and may 

 go some distance back up the tributaries toward the mountains. It is common on the 

 Pecos and the Devils River in western Texas, where it reaches a larger size but still 

 retains the shrubby habit. Its leaflets (6 to 12 pairs) are lanceolate, acuminate, sub- 

 falcate, with oblique bases, entire or with relatively few teeth which are rendered more 

 inconspicuous because the margin is revolute. It has been confused with the other 

 New Mexican species by many writers and collectors, although Doctor Torrey had a 

 good conception of the two when he described them. He evidently believed them 

 to be distinct and assigned one of them (/. major) to subspecific rank, as he says, 

 "for the present," probably because of the statements of some of the collectors who 

 had not seen both. The species is easily recognized by its smaller size, shrubby 

 habit, smaller and more numerous leaflets, and very small, thick-walled nut only 

 10 to 15 mm. in diameter. 



2. Juglans major (Torr.) Heller, Muhlenbergia 1: 50. 1900. 



Juglans rupestris viajor Torr. in Sitgreaves, Rep. Zuni & Colo. 171. pi. 16. 1854. 



Type locality: "Western New Mexico." This is certainly Arizona. 



Range: New Mexico and Arizona and southward. 



New Mexico: Magadalena Mountains; Burro Mountains; Mangas Springs; Fort 

 Bayard ; Black Range; Dog Spring; Animas Mountains; White Mountains. Mountains, 

 in the Transition Zone. 



In his original description of this species Doctor Torrey says that "Dr. Woodhouse 

 found the plant in western New Mexico and Dr. Bigelow collected it at the Copper 

 Mines." "Western New Mexico" at that time included Arizona. The plant com- 

 mon in the region of the Copper Mines is a good-sized tree, not infrequently with a 

 trunk 3 to 4 meters to the first branch and 40 to 50 centimeters in diameter, with a 



