30 HOUGH'S AMERICAN WOODS. 



USES. The Arizona Sycamore is not a wood of commercial import- 

 ance though of a highly ornamental nature and possessing the same 

 useful properties that are found in the eastern species. 



ORDER JUGLANDACEJB: WALNUT FAMILY. 



Leaves alternate, pinnate and without stipules. Flowers monoecious and 

 apetalous, except m some cases in the fertile flowers. Sterile flowers in catkins 

 with an irregular calyx adnate to the scale of the catkin. Fertile flowers solitary 

 or in small clusters, with calyx regularly 3-5-lobed, adherent to the incompletely 

 2-4-celled, but 1-ovuled ovary. Fruit a sort of dry drupe (a tryma), with a 

 fibrous and more or less fleshy and coriaceous outer coat very astringent to the 

 taste, a hard, bony inner coat, and a 2-4-lobed seed, which is orthotropous, with 

 thick, oily and often corrugated cotyledons and no albumen. . 



All representatives of the order are trees. 



GENUS JUGLANS, L. 



Leaves odd-pinnate, with numerous serrate leaflets; leaf -buds few-scaled or 

 nearly naked. Sterile flowers in long, simple, imbricated, axillary catkins from 

 the wood of the preceding year; calyx unequally 3-6-cleft; stamens 12-40 with 

 very short and free filaments. Fertile flowers several in a cluster or solitary at 

 the ends of the branches; calyx 4-toothed and bearing in its sinuses 4 small 

 petals; styles 2, very short; stigmas 2, somewhat club shaped and fringed. Fruit 

 drupaceous with a fibrous and spongy,- somewhat fleshy, indehiscent epicarp and 

 a rough irregularly furrowed endocarp; embryo edible and wholesome. 



Trees with strong-scented resinous-aromatic bark and a pith which separates 

 into thin transverse disks. (Juglans is contracted from Latin Jovis glans, the 

 nut of Jove.) 



233. JUGLANS RUPESTRIS, ENGELM. 



MEXICAN WALNUT, ARIZONA WALNUT. 



Ger., Arizonischer Wallnuszbaum ; Fr., Noyer & Arizona ; Sp., 



Nogal de Arizona. 



SPECIFIC CHARACTERS: Leaves from 15-17 in. in length, with pubescent 

 petioles and 9-23 lanceolate to ovate-lanceolate acuminate leaflets which are 

 2 1-2-5 in. long, quite inequalateral, short-petiolate or nearly sessile, thin and 

 glabrous or somewhat pubescent especially beneath. Flowers (April to May) the 

 staminate in slender puperulous catkins from 2 1-2-4 in. in length, with ovate- 

 lanceolate acute pale-tomentose scales; perianth 3-5-lobed, light yellowish green; 

 stamens about 20 with nearly sessile yellow anthers and slightly lobed connec- 

 tives; pistillate flowers in few-flowered spikes, tomentose and from 1-8-1-4 in. in 

 length; bractlets puberulous at apex, laciniate; calyx lobes puberulous outside; 

 stigmas about 1-3 in. long, plumose, spreading, greenish red. Fruit subglobose, 

 1-2-1 1-2 in. long, with thin glabrate epicarp and globose or laterally compressed 

 nut, blackish, deeply sulcate, thick-walled, without sutural ridges and containing 

 a sweet edible kernel. 



The specific name, rupestris, from the Latin rupes, a rock, is significant of the 

 nature of the regions in which this tree is found. 



A handsome tree occasionally attaining a height of 50 ft. (15 m.) 

 with a trunk 4 or 5 ft. (1.50 m.) in diameter, covered with grayish 

 brown bark, fissured into longitudinal and obliquely connecting ridges 

 which exfoliate in thick elongated fibrous scales. 



