MACLOSKIE : CRUCIFERyE. 425 



Chili ; N. W. Patagon., on dry rocks near Lago Nahuel-huapi. 



2. HEXAPTERA NORDENSKJOLDI Dusen. (Plate XVII.) 

 Root stout, fusiform. Stems numerous, simple or nearly so, thickish, 

 with the leaves crowded upwards. Leaves woolly, cuneate, 3-nerved and 

 3-lobed, the lobes narrow, rounded at the apex. Racemes dense, hemi- 

 spherical. Sepals oval, 3-nerved, hairy outside. Petals spatulate, twice 

 as long as the sepals, pale yellow, reddish up\vards. 



S. Patagon., O. Nordensk. at Cerro Contreros, 900 meters altitude ; 

 near source of Rio Coy, by Hatcher ; "abundant in Cordilleras above the 

 timber-line." Hatcher's specimens have the petals and the lobes of the 

 leaves broader than in Dusen's description. 



3. H. TRIDENS Phil. 



Hoary pilose. Leaves obscurely and long triangular, apically truncate 

 and 3-toothed. Petals white. 



Mountains at Cuestada Maracoyo, S. Amer., at 4,000 meters elevation. 

 (Not in Patagonia?) 



3. LEPIDIUM Linn. Pepper-grass. 



White flowers, often with fewer than 6 stamens. Petals short or none. 

 Silkies oblong or obovate, flat with narrow septum, its valves keeled, 

 dehiscent. Seeds i in each cell, flat. Cotyledons incumbent (or falsely 

 accumbent through torsion). (Figs, in Eng. & Prantl, iii, 2, p. 160.) 



Species 160, most in temperate zones; some in Chili, Argentina, Aus- 

 tralia and New Zealand. 



KEY TO THE SPECIES. 



A. Leaves entire, or the lower pinnatifid, linear. Silicles orbicular, longer than the pedicel. 



Flowers small. spicatum. 



A2. Leaves bipinnatifid, and further cleft. bipinnatifidum. 



A$. Leaves once -pinnatifid. Silicles wingless. bonariense. 

 A^.. Lower leaves pinnatifid, others entire. 



b. Silicles suborbicular, wingless. Petals none. Flowers small. ruderale. 

 b2. Silicles oval-orbicular. Petals none in upper flowers. Pedicels inclined, racemosum. 



b^. Silicles oval, winged all round. sativunt. 



I. L. BIPINNATIFIDUM DeSV. 



5-30 cm. high, branches pubescent. Leaves 2-pinnatipartite, their lobes 

 multifid ; rachis winged. Silicles oval, emarginate, half as long as the 

 pedicels. 



