OF ARTS AND SCIENCES. 135 



tube : fruit not seen. — L. venosus, var. obovatus, Torrey in Pacif. R. 

 Rep. 4. 77. In the Sierra Nevada, in Calaveras County, where it has 

 been collected by Bigelow, Brewer (n. 1602, 1612), Dr. G. L. Good- 

 ale, and H. Mann. Other specimens fiom the Blue Mountains, Ore- 

 gon (Rev. R. D. Nevius), and from Northern Idaho (Geyer, n. 312; 

 L. polpnorphus, Hook. Jour. Bot. 6. 207), are probably the same, 

 with rather narrower and acuter leaflets. 



•^ SoPHORA Arizonica. An evergreen shrub, somewhat canescent 

 with short appressed silky hairs : leaflets two or three pairs, nar>- 

 rowly oblong, acutish, about an inch long ; stipules small, subulate : 

 racemes very short (half an inch long), and few-flowered; bracts de- 

 ciduous : pedicels bracteolate, about three lines long : calyx narrowed 

 at base : pods smooth, coriaceous, compressed, reticulated and with 

 nerve-like margins, three or four inches long, more or less contracted 

 between the thick oblong (half inch long) seeds ; stipe exceeding the 

 calyx. — S. speciosa, Torrey in Pacif. R. Rep, 4. 82. At Cactus 

 Pass and on White Cliff Creek in W. Arizona, by Dr. Bigelow ; 

 only fruiting specimens found, January. The pod is thinner and more 

 compressed than is usual in the genus and the seed less globose. 

 The more eastern »S'. speciosa, Benth., has very thick and terete silky 

 pods, with ovate seeds, and larger obtuse or emarginate cuneate- 

 obovate or broadly spatulate leaves. 



•^ Parkinsonia Torreyana. a small tree, twenty or thirty feet 

 high, with smooth light green bark ; younger branches and leaves 

 sparingly pubescent : leaflets two or three pairs in each pinna, oblong, 

 obtuse, narrower toward the somewhat oblique base, two or three lines 

 long, glaucous : flowers on long pedicels in racemes terminating the 

 branches ; pedicels jointed near the middle, the joint not evident until in 

 fruit: petals apparently bright yellow, four lines long; claw of the 

 upper petal with a thick prominent gland: ovary »labrons : pod with a 

 double groove along the broad ventral suture, usually two inches long 

 or more, 2-8-seeded, straight or somewhat contracted between the 

 seeds : seeds very thick. — Cercidium Jloridam, Torrey in Pacif R. 

 Rep. 5. 360, t. 3. Abundant on the Lower Colorado River and in 

 the valleys of Western and Southern Arizona, and known as Palo 

 Verde or Green-barked Acacia. It has been always mistaken for 

 P. jlorida {Cercidium Jloridum, Benth.), of the Rio Grande Valley, 

 which has sessile axillary racemes, pods with a narrow acute mai-gin 

 on the ventral side, thinner seeds, and somewhat smaller leaflets. 



The characters which have been relied upon to separate Cercidium, 

 Tulasne, from Parkinsonia, do not hold good in regard to our western 



