452 PATAGONIAN EXPEDITIONS I BOTANY. 



The capsule is intermediate between the Siliquosae, as Arabis, and the 

 Siliculosae, as Draba. 



(B. uniflora Hook. f. &Thou. growing in Thibet at 4,500 meters of ele- 

 vation, has connate sepals, a unique case in this family of 1,500 species.) 



Species 12, in cold parts of all continents. Members of this genus belt 

 the world, from Eur. Alps, by Thibet, Himalayas, Siberia, Arctic regions, 

 to Chili, Patagon. and N. Zeal. 



KEY TO THE SPECIES. 



A. Leaves narrow-linear, acute, margin pectinate-spinulose. Peduncle short. lycopodioides. 

 A2. Leaves ovate-obtuse, rather small, similar. 



b. Forming cushions. Leaves ciliate, silvery. Flowers sessile. glebaria. 



l>2. Branches crowded. Peduncle as long as the leaves. patagonica. 



A$. Leaves ovate-linear, acute, pectinate-ciliate, all similar. Flowers sessile. pectinala. 

 A^. Basal leaves spatulate-linear, fleshy, hispid to ciliate. Stem-leaves scanty or none. Flowers 



racemed. pusilla. 



A$. Leaves small, triangular-ovate; stem-leaves smaller; large leaves enclosing the solitary 

 flower. Peduncle short. pycnophylloidcs. 



i. BRAYA GLEBARIA Speg. 



Robust perennial with rather large caudex, and crowded branches 

 making hemispherical cushions. Leaves densely imbricate, small, ovate, 

 obtuse, all isomorphous, densely fimbriate-ciliate on their margin, cinere- 

 ous silvery. Flowers largish, acrogenous, solitary, sessile. Sepals ellip- 

 tic-elongate, oblong-obtuse, glabrous, saccate and green at the base. 

 Petals ochroleucous, exceeding the sepals, spatulate. Silicles unknown. 



Chubut, in basalt rocks near Lago Musters and Choique-lauen. 



2. B. LYCOPODIOIDES Speg. 



Subdichotomoiisly branching, creeping, erect at apex. Leaves rather 

 large, narrow-linear, acute, coarsely keeled, the margins aculeolate-pecti- 

 nate, all similar. Flowers apical. Silicle rather large, obovate to broad 

 lanceolate. Peduncle not exceeding the uppermost leaves. 



S. Patagon., on dry plains near Rio Chico de Sta. Cruz; between San 

 Julian and Rio Deseado. 



B. LYCOPODIOIDES CONTRACTA Speg. 



Branches short and densely crowded. By Rio Deseado. 



