22O PATAGONIAN EXPEDITIONS I BOTANY. 



4. P. LEPTOSTACHYS (Speg.). 



Small, cespitose, glabrous. Culms not sheathed, simple. Leaves 

 fasciculate, erect, very short, the ligules lanceolate. Spike linear, few- 

 spiculate ; spikelets minute, remote, sessile, 3-flowered. Glumes unequal. 



Magell. 



5. P. MAGELLANICA (Hook. f.). 



Glabrous, with culm erect and covered by the leaf sheaths, which are 

 longer than the involute leaf blades. Panicle long, lax ; its rays in flower 

 apically elongated. Spikelets 4-6-flowered ; glumes apically eroded ; 

 floral glumes 5-nerved. 



S. Patagon., by R. Sta. Cruz ; Magell., in wet meadows by Gregory 



Bay. 



51. ATROPIS Ruprecht. 



Panicle at length contracted. Spikelets 2-9-flowered. Empty glumes 

 3-nerved, or the first i -nerved, much shorter than the flowers ; floral 

 glumes chartaceous or scarious, convex or slightly keeled, obscurely par- 

 allel 5-nerved, midnerve sometimes produced, the side nerves short; 

 Palea with convergent ciliolate nerves, 2-toothed. Stigmas subsessile. 

 Grain obcompressed, enclosed but free. 



Species 14, in all temperate regions. 



i. A. CARINATA Griseb. 



Cespitose, glabrous, 10 cm. high. Leaves involute, acuminate, rigid, 

 their sheath lax below, their ligules long. Panicle ovate-oblong, the 

 rachis sulcate on one side. Spikelets oblong, 4-5-flowered ; floral glume 

 silky below, 2-toothed above with a median mucro. 



(Paraguay ; Argentina) ; N. Patagon. 



2. A. MAGELLANICA Hook. f. 



Glabrous, 30 cm. tall ; leaves involute ; ligules ovate-acute ; sheaths 

 lax. Panicle 15 cm. long, its rays long, slender. Spikelets oblong, 

 4-6-flowered, 8-12 mm. long, the flowers distant, cylindraceous ; floral 

 glume narrow, 4 mm. long, attenuate to an obtuse spike, glabrous except 

 the pilose callus ; palea as long. 



"Differs from A. parviflora by flowers twice as large, keels of the palea 

 spinulose, ciliate the whole way, panicle lax, branches naked in the lower 

 two thirds, and its simple spiculiferous branching.' 1 '' (Dusen.) 



E. Fuegia. 



