JUGLANDACE^E 



173 



long; calyx nearly orbicular, long-stalked, pale yellow-green, 5 or 6-lobed, the lobes ovate, 

 acute, hoary pubescent on the outer surface, their bract acute, coated with thick pale 

 tomentum; stamens 30-40, with nearly sessile yellow anthers, and slightly divided con- 

 nectives; pistillate not seen. Fruit subglobose to slightly ovoid or oblong, abruptly con- 

 tracted at apex into a short point (J. elaeopyren Dode), densely tomentose when half 

 grown, l'-l-|' in diameter, with a thin husk covered with close rufous pubescence; nut dark 

 brown or black, slightly compressed, usually rather broader than high, or ovoid, rounded 

 or bluntly acute at apex, rounded and sometimes depressed at base, longitudinally grooved 

 with broad deep grooves, thick shelled; seed small and sweet. 



A tree sometimes 50 high, with a straight trunk occasionally 3-4 in diameter, or 

 divided at the ground into several large stems, stout branches forming a narrow head, and 

 slender branchlets thickly coated when they first appear with rufous pubescence, becoming 

 red-brown, pubescent or puberulous and marked by many small pale lenticels at the end 

 of their first season and ashy gray the following year. 



Distribution. Banks of streams in the canons of central and southern New Mexico and 

 Arizona, and on Oak Creek near Flagstaff, Arizona on the Colorado plateau (P. Lowell). 



4. Juglans rupestris Engelm. Walnut. 



Leaves 9'-12' long, with slender pubescent or puberulous petioles and rachis, and 13-23 

 narrow lanceolate long-pointed usually falcate finely serrate leaflets entire or nearly entire 

 on their incurved margins, cuneate or rounded at base, thin, light green, glabrous or pubes- 



Fig. 166 



cent on the midrib below, 2'-3' long and i'-f wide. Flowers: staminate in slender 

 aments, 3'-!' long, pubescent when they first appear, becoming glabrous; calyx short- 

 stalked, nearly orbicular, light yellow-green, puberulous on the outer surface, 3-5-lobed 

 with rounded lobes, their bracts ovate-lanceolate, coated with hoary tomentum; stamens 

 about 20, with nearly sessile yellow anthers and slightly lobed connectives; pistillate flowers 

 oblong, narrowed at the ends, thickly coated with rufous pubescence; bract and bractlets 

 irregularly divided into a laciniate border rather shorter than the ovate acute calyx-lobes; 

 stigmas green tinged with red, %' long. Fruit globose or subglobose, tipped with the persis- 

 tent remnants of the calyx, pubescent or puberulous with rusty hairs, ^'-f in diameter, 

 with a thin husk; nut subglobose to slightly ovoid, sometimes obscurely 4-ridged from the 

 apex nearly to the middle (J. subrupestris Dode), deeply grooved with longitudinal sim- 

 ple or forked grooves, 4-celled at base, 2-celled at apex, thick shelled; seed small and 

 sweet. 



A shrubby round-headed tree occasionally 20-30 high, with a short generally leaning 



