CATALOGUE. 31 



3-lobed at the apex, with a broad ciliated petiole ; lobes rounded, obtuse ; 

 scapes scarcely exceeding the leaves, 1-5-flowered ; flowers unknown ; pods 

 ovate, narrowly bidentate above, a line in length, thrice longer than the 

 style ; cotyledons accumbent.— Whole plant scarcely an inch high, in dense 

 mats, the caudcx branching into numerous heads, each terminated by a 

 crowded cluster of small leaves. On a dry gravelly knoll at the head of 

 Holmes Creek, Nevada; 6,000 feet altitude; September. Plate IV. Fig. 

 5. A branch ; natural size. Fig. 6. A branchlet ; enlarged two diameters. 

 Fig. 7. A leaf; enlarged four times. (127.) 



Thlaspi alpestee, L (?) Perennial, glabrous ; stems ascending, 3-12' 

 high, simple ; radical leaves petioled, ovate or obovate, entire or denticulate, 

 the cauline ovate or oblong, cordate-clasping ; racemes crowded or usually 

 elongated and loose, h-Q' long ; flowers rather large, the petals 1-3" long ; 

 pods 2-4" long, acutely margined but not winged, short-oblong, cuneate at 

 base, emarginate, truncate, or rounded at the apex, 4-8-seeded ; style i-1" 

 long. — Usually referred to T. cochlearifonne, DC, and including T. Fendleri, 

 Gray, but the same as European and Tibetian specimens of T. alpestre, ex- 

 cept in its usually larger flowers. In the Rocky Mountains, from the head- 

 waters of the Columbia to New Mexico. Frequent in the East Humboldt 

 and Clover Mountains, Nevada, and in the Wahsatch and Uintas ; 8,500-11,000 

 feet altitude ; July-September. (128.) 



Thysanocarpus^ elegans, Fisch. & Mey. Leaves oblong-lanceolate, 

 radical ones pinnatifid or repandly toothed, the cauline mostly entire and 

 sagittate-clasping ; silicles orbicular-obovate, plano-convex, broadly winged, 

 obscurely crenate, the margin entire or perforated, not marked by elevated 

 radiating veins.' — Stem 1-2° high, branched above; quite variable in foliage, 

 pubescence, and development of the wing. The species doubtless includes 

 T. curvipes, Hook., and T. pulchellus, F. & M. T. radians, Benth., is clearly 

 distinct, as also T. laciniatus, Nutt., (which probably should include T. crena- 

 tus,) and T. pusillus, Hook, {=T. oWongifolius, Nutt.) California and Ari- 

 zona, north to the Columbia. .Near Carson City and in the West Humboldt 

 Mountains, Nevada; 5,000 feet altitude ; April-June. (129.) 



' THYSANOCAEPUS, Hook. Petals small. Pod ovate, obovate, or orbicular, much compressed, 

 1-celled, indehiscent, membranously winged ; style filiform. Seed pendulous, wingless ; cotyledons aocum- 

 bent or obliquely incumbent. — Slender branched annuals ; flowers small, racemed, on filiform pedicels, 

 which are nodding in fruit. Bbnth. & Hook. 



