OF ARTS AND SCIENCES. 849 



liispul and quite spinulose ; stipules oblong-lanceolate ; leaves thin, 

 ovate or the upper oblong-lanceolate, 2-4 inches long, acute, subcor- 

 date or rounded at base, coarsely serrate, finely hispid beneath, tuber- 

 culately roughened above ; petioles |—1 1- inches long ; flowers in short 

 loose open panicles, scarcely exceeding the petioles ; perianth obovate, 

 obtuse, minutely hispid, nearly a line long, twice longer than the broadly 

 ovate acheniura. — Los Angeles, California, frequent in waste places 

 (Brewer, n. 9.3) ; collected also by Bigelovv on the banks of the Limpio 

 in Western Texas ( U. dloica, Torrey in Bot. jMex. Boundary, in 

 part), and also by Wolf on Lieut. Wheeler's Survey in Southern 

 Colorado. 



The only other Californian species of the genus is U. holosericea 

 of Nuttall's PI. GamhelUance (the same probably as U. trachycarpa of 

 Weddell), which is found near Monterey. It is densely hoary-tomen- 

 tose, especially on the lower side of the leaves ; the oblong stipules 

 acuminate ; leaves thick, oblong-lanceolate and acuminate, on short 

 petioles ; male flowers in loose slender panicles nearly equalling the 

 leaves, the female more numerous in dense and shorter panicles ; peri- 

 anth ovate, densely hisjiid, about equalling the small broadly ovate 

 acheniura. Eastward of the Sierra Nevada, in Nevada and South- 

 ern Utah, the western finely tomentose or velvety form of U. gracilis 

 occurs, referred to U. dioica in King's Reports, vol. 5, p. 32L 



Platanus Wrightii. Leaves subtomentose beneath, very acutely 

 and deeply .o-7-lobed, the lower lobes projected backwards and form- 

 ing a deep sinus ; j^etioles ^-^ inches long ; racemes not exceeding 

 the leaves; fertile heads three, 8-10 lines in diameter; nutlets gla- 

 brous, villous at base, truncate above and tubercled with the short 

 base only of the style ; receptacle densely hairy and fruit-bearing over 

 nearly the entire surface. — Collected by Wright (n. 1880) in south- 

 eastern Arizona near the San Pedro, and described as a large tree. It 

 is very distinct from the Mexican and Californian species, in regard to 

 which there is still some confusion. 



Jdglans Californica. More or less floccose-tomentose or some- 

 times nearly glabrous ; leaflets 5-8 pairs, oblong-lanceolate, acute, 

 narrowing upwards from near the base, 2-2^- inches long; male 

 aments 4-8 inches long, often in pairs ; sepals acute or obtuse, veined, 

 1 i- lines long; stamens 30-40, the anthers a line long, with the apex 

 of the connective very short and bifid ; fruit globose, slightly com- 

 pressed, |-1 inch in diameter ; nut shallowly sulcate, the walls rather 

 thin and with two broad cavities upon each side. {J. 7-upestris, var. 

 major, Torrey in Sitgreave's Report, p. 171, t. 16.) — A large shrub 



