JUGLANDACE^. 



SILVA OF NORTE AMERICA. 



125 



JUGLANS RUPESTRIS. 



Walnut. 



Leaflets 9 to 23, lanceolate to ovate-lanceolate. Fruit usually spherical; nut 

 globose, deeply sulcate, 4-celled at the base. 



Juglans rupestris, Engelmann, Sitgreaves' Rep. ITl, t. 15 Koehne, Deutsche Dendr. 75, f. 24 B. B. — Coulter, Con^ 



(1853). 



Mex. Bound, Surv. 205 ; Ives^ 



trib. U. S. Nat. Serb. ii. 412 (Man. PL W. Texas). 



Rep. 27. — C. de CandoUe, Ann. Sci. Nat. s^r. 4, xviii. Juglans rupestris, var. major, Torrey, Sitgreaves' Rep. 



28, t. 2, f . 11 ; Prodr. xvi. pt. ii. 138, — Brewer & Wat- 

 son, Bot. Cal. ii. 93. — Rusby, Bull. Torrey Bot. Club^ 

 ix. 54. — Lauche, Deutsche Dendr. 305- — Hemsley, Bot. 



171, t. 16 (1853) ; Bot. Mex. Bound: Surv. 205 ; Pacific 

 R. R. Rep. vii. 20. — C. de Candolle, Prodr. xvi. pt. ii. 

 138. 



Biol. Am. Cent. iii. 164. — Sargent, Forest Trees N. Am. Juglans Calif ornica, Rothrock, Wheeler's Rep. vi. 249 



10th Census U. S. ix. 131 (excl. syn. Juglans Califor- 



nica). 



Dippel, Handb. Laubholzk. ii. 323, f. 146. 



(not Watson) (1878). — Coulter, Contrib. U. S. Nat 

 Herb. ii. 412 {Man. PI. W. Texas). 



A tree^ sometimes fifty feet in height, with a short trunk occasionally four to five feet in diameter, 

 and sometimes dividing near the ground, or usually ten or fifteen feet above it, into several stout 

 branches, which are nearly upright throughout, forming a narrow head of rather formal outline, or, 

 when the tree is growing in moist soil, sometimes begin to spread a few feet above the division of the 

 trunk and become more or less pendulous at the extremities, making a handsome symmetrical round- 

 topped head ; or often reduced to a shrub sending up from the ground a cluster of stems only a few 

 feet in height. The bark of the trunk varies from a quarter of an inch to nearly an inch in thickness. 



d is deeply furrowed and broken on the surface into thin appressed 



that of young trunks and 



of the branches is smooth, pale, and sometimes nearly white. The branchlets, when they first appear, 

 are coated, Hke the petioles, with a pale or light brown scurfy pubescence or tomentum, which often 



does not entirely disapp 



til the end of the second or third year 



their first winter they 



orange-red, and marked by many small pale lenticels, growing lighter in their second season, and grad- 

 ually become pale or nearly white. The terminal buds, which vary from one quarter to one half of an 

 inch in length, are compressed, narrowed and often oblique at the apex, and are covered by two pairs 

 of strap-shaped scales, the outer pair being pointed and often obscurely pinnate at the apex, and 

 clothed with rusty or pale tomentum, while the inner pair are thicker, rounded on the back, flat on the 

 inner face, and half an inch long when fully grown. The axillary buds are an eighth of an inch long, 

 compressed, covered with dark scales, often open at the apex during the winter, and coated with pale 

 pubescence- The leaves, composed of from nine to twenty-three leaflets and slender pubescent petioles. 



are from seven to fifteen inches in length ; the leaflets are lanceolate. 



ceolate 



or 



Tely 



ovate. 



ually very unequal on the two ed 



8 



coarsely or finely crenulate 



xly 



and rounded or wedge-shaped on the other edge, and distinctly 



the base, which is rounded on one 

 petiolulate or sometimes nearly sessile 3 when they unfold they are bronze-red, pubescent below, and 

 puberulous above, and at maturity are from two and a half to five inches long, one third of an inch to 

 an inch and a half wide, thin, dark yellow-green and glabrous, or often pubescent on the lower surface, 

 especially along the stout yellow midribs and primary veins, which are also sometimes pilose above. In 



leaves turn yellow before falling. The catkins of staminate flowers, which protrude 



the autumn the leaves turn 



slio-htly from the bud-scales during the winter 



C5 



are slender, slightly puberulous, and from two and one 

 The bract of the staminate flower is ovate-lanceolate, acute, and coated with 



half to four inches loi 



thick pale tomentum. The perianth, which opens in April and May after the leaves are about half 



