232 PATAGONIAN EXPEDITIONS : BOTANY. 



cookii Hook. f. 1847 = P a cookii Hook. f. 1879, is the commonest grass 

 in Kerguelen I., affording excellent fodder.) 



The chief mark of this genus is the rounded floral glumes without any 

 prominent keel, at least at the base, and acute or awned at the top. 



KEY TO THE SPECIES. 

 A. Panicle lax. 



b. Spikelets 2-3-flowered. Culm 50 cm., slender, exceeding the convolute leaves. Panicle 



cernuous, smooth. Glumes and floriglume subequal, awnless. pogonantha. 



b2. Spikelets 3-4-flowered, some viviparous. Culm 50 cm., exceeding the rush-like, pungent 



leaves. Glumes scabrid, floriglume larger, setulose. commersoni. 



3. Spikelets 4-5 -flowered, 10 mm. long. Culm tall, sheathed. Rays in 2's, capillary. 

 Glumes unequal ; floriglume 8 mm., short-awned. glaucophylla. 



64. Spikelets 5-7-flowered. Culms 45 cm., fertile and sterile ; leaves narrow, puberulous. 



Raylets few-spiculate. Floriglumes /-nerved, mucronulate. lechleriana. 



5. Spikelets about 8-flowered. Culms tall. 



c. Culms slender, glabrous. Upper glume thrice as long as lower. Floriglume 5 -nerved, 



awned. Leaves short, flat. purpurascens . 



c2. Culms naked a long way. Floriglume 8 mm., cuspidate. Spikelets few, 18 mm. long, 



8 lo-flowered. serranoi. 



b6. Spikelets large, 8-25 mm. long, often viviparous. Culm 45 cm.; leaves strict, short, 



ligules long. Floriglume acuminate, silky. fuegiana. 



A2. Panicle oblong-contracted. Floriglumes acute, awnless. 



b. Leaf-blades long, smooth, 68 mm. broad. Spikelets 4-8-flowered, with woolly rachis. 



plant robust. alopecurus. 



bz. Leaf-blades narrow-linear, rigid, acute. Spikelets compressed, patent. antarctica, 

 A$. Panicle contracted, subsecund. Culms slender, 40 cm., tufted or creeping. Leaves one 

 third as long. Spikelets 3-8-flowered ; floriglume short-awned. Also sterile shoots. 



ovina. 

 A^.. Panicle racemose, secund. 



b. Leaves narrow-linear ; culm and sheaths glabrous. Rays alternate. Spikelets 5-9- 



flowered. Awns rough, exceeding the smooth floriglumes. muralis. 



b2. Leaves convolute, with auriculate ligules. Culm 20 cm., basally jointed and sheathed, 



Glumes unequal, the lower setaceous. Flowers in 5's, long-awned. myums. 



b$. Leaves linear-setaceous ; culm 25 cm. Panicle spike-like in upper part. Lower glume 



small. Awn twice as long as floriglume. bromoides. 



A$. Panicle long-racemose, not secund. 



b. Leaves linear-filiform. Culm i meter, slender. Panicle inclined, few-spiculate. Spikelets 



7-9-flowered. Awn short. gracillima. 



b2. Leaves linear, with long ligules ; culms thrice as long, 28 cm. Spikelets 4-flowered. 



Floriglume i-nerved, keeled above, awnless. patagonica. 



b$. Leaves flat, narrow, 1-4 cm. long ; culm 25 cm., branching. Spikelets few, 2-flowered. 



Lower glume the longer. Floriglume 5-nerved, awnless. biflora. 



A6. Panicle strict, its rays paired or solitary. Leaves thickish, lanceolate, acuminate. Spikelets 

 few, 7-flowered. Floriglume setulose. platyphylla. 



