362. PROCEEDINGS OF THE AMERICAN ACADEMY 



2. Descriptions of New Species of Plants, chiefly from our Western 



Territories. 



Myosurus cupulatus. Scapes slender, 2 to 6 inches high : 

 anthers oblong, much shorter than the filaments : fruiting heads loose, 

 long-conical, about an inch (3 to 1 G lines) long : akeues short and 

 subquadrate, cupulate at the summit with a raised and at length irreg- 

 ularly thickened light-colored margin, and witli a broadly triangular 

 slightly curved ascending beak. — Arizona ; hills between the Gila 

 and San Francisco Rivers, Rev. E. L. Greene ; on the Santa Catalina 

 Mountains, at 8,000 feet altitude, J. G. Lemmon ; found by both col- 

 lectors in April, 1880. Readily distinguished in fruit by the peculiar 

 akenes. In habit it resembles M. minimus, which has less attenuated 

 closely compact heads, on often very stout scapes, the rectangular 

 akenes truncate and beakless or with a very short strictly appressed 

 beak ; the anthers linear and nearly equalling the filaments. In the 

 usually small M. aristatus the loose heads are rarely more than 3 or 4 

 lines long, the oblong-ovate akene with a long slender somewhat 

 spreading beak. 



Myosurus sessilis. Without scapes, the flowers sessile or very 

 nearly so : fruiting heads usually several (1 to G) and crowded, much 

 shorter than the leaves, stout and conical (2 to 6 lines long by a line 

 or more in thickness at base) : akenes with a prominent costa termi- 

 nating in an erect or spreading subulate beak. — On alkali flats in 

 Umatilla County, Oregon ; J. & T. J. Howell, May, 1882. 



Arabis furcata. Perennial, the slender stems ascending from 

 a slender branching rootstalk, a foot high or more, glabrous : leaves 

 sparingly pubescent and ciliate with branched hairs, the lower petio- 

 late, oblong-obovate, acutish, with few teeth, an inch or two long, the 

 cauline sessile, oblong to linear, mostly glabrous : flowers white, 3 to 

 5 lines long, with yellowish sepals : pods narrow, i to li inches long, 

 beaked by the thick style, on slender spreading pedicels 6 to 10 lines 

 long. — On the blufi^s of the Columbia, near the mouth of Hood River, 

 Oregon ; J. & T. J. Howell, in 1879, and with immature fruit in 

 May, 1882 ; received also from Mrs. P. G, Barrett, of Hood River. 

 A dwarf alpine form, with shorter pedicels, was collected on Mount 

 Adams at the White Salmon glacier by W. N. Suksdorf in 1877, and 

 again in 1879. 



Arabis suffrutescens. Perennial, with a decidedly woody 

 branching base, glabrous or sparingly stellate-pubescent, the erect 

 subfastigiate stem^ a foot high : lower leaves linear-oblanceolate, acute. 



