l6o PATAGONIAN EXPEDITIONS : BOTANY. 



<f3. Spikelets 2-many-flowered, placed sidewise on the axis, mostly in thick spikes, 

 the joints usually not coming apart. Glumes ovate, 3-many-nerved. Floral 

 glume with a callus, falling away when ripe along with a single grain attached 

 to the palea. 57- Agropyron, p. 245. 



d2. Spikelets 2-6 on every segment of the rachis. Stamens 3. 

 e. Spikelets i -flowered, with at most the rudiment of a second. 



58. Hordeum, p. 248. 

 e2. Spikelets 2-many-flowered. Empty glume slightly smaller than the floral. 



59. Elymus, p. 252. 



B2. Culm woody at least at base. Leaves often with short petiole, jointed to the sheath. 



(BAMBUSE.E.) 



Section with 3 stamens; paleae 2 -keeled. Fruit without a soft pericarp. Spikelets i- 

 flowered, panicled. 60. Chusquea, p. 255. 



i. ELIONURUS Humb. & Bonpl. 



Andropogonece, with i -flowered awnless spikelets, some sessile, some 

 pediceled. Rachis jointed, easily breaking into segments, the 2-pointed 

 lower glume strongly fragrant when fresh or wet, having a balsamiferous 

 gland. 



Species 15, chiefly in warm parts of America, and some in Africa, the 

 Orient and Australia. Savanna-grasses, avoided by cattle; the scent 

 seeming to deter them. 



E. c AND i BUS (Trin.) Hack. 



Leaves filiform, below generally piliferous. Ligule composed of long 

 hairs. Spikes (7-10 cm.) ; pedicel of acute male spikelet, and inferior 

 glume of both spikelets white-silky villous. Perennial grass. 



(Brazil) ; N. Patagon., in sandy meadows by Carmen de Patagones, 

 and Bahia de S. Bias. The Patagonian specimens differ from the descrip- 

 tion by the pilosity of the culms below the nodes, and of the outside of 

 the leaves, which are subtrigonal in section, and with 3 larger nerves, and 

 in the absence of balsam-glands. 



2. ANDROPOGON Linn. Beard-grass. 



Spikes terminal and axillary, having a jointed hairy axis, with spikelets 

 in pairs at each node, one of each pair being sessile and perfect, the other 

 pedicellate and staminate or rudimentary. Perfect spikelet with ^glumes, 

 of which the uppermost (the flowering glume) is awned and subtends a 

 palea with a perfect flower. (Britt. & Br. i, 100.) 



