MACLOSKIE ! GRAMINE^E. 213 



Styles distinct. Grain subtriquetrous, enclosed in the palea, not adherent. 

 Species about 2, in southern U. S. and S. Amer. 



M. AUSTRALIS Speg. 



Densely pulvinate-cespitose ; the short branches pectinately leafy. 

 Leaves small, complicate, rigid, callous-pointed. Spikes acrogenous, sub- 

 sessile, compressed ; with 2, rarely 3 flowers ; often with a produced 

 glumiferous rachilla ; floriglume subcarinate ; palea bicarinate, all glabrous. 

 (Only the male specimens known.) 



S. Patagon., dry salinas between S. Julian and Rio Deseado. 



41. GYNERIUM Humb. & Bonpl. Pampas-grass. (Cortaderia Stapf.) 



Tall, tubular grasses, often with woody base. Leaves very long, narrow, 

 crowded at the base ; ligules a line of hairs. Panicle ample, dense, be- 

 coming lax and nodding, silvery or dark. Spikelets 3-y-flowered, dice- 

 cious, racliilla longish, articulate in both sexes, with long hairs arising 

 from the membranaceous or thin narrow glumes. Empty glumes as long 

 as the spikelet, scarcely equal, i-3-nerved or nearly nerveless, acuminate. 

 Floral glumes 3-nerved, the mid pointed and produced as an awn, mostly 

 glabrous in the male, long-pilose in the female. Stamens 3 in the male 

 flowers, also rudiments in the female, and rudimentary ovary in the males. 

 Grain narrowly oblong, free within the glume and palea. 



Species 5, in extratrop. S. Am. and along the Andes northwards. 



i. G. ARGENTEUM Nees. (Cortaderia dioica Speg.) Pampas-grass. 



3-6 m. tall. Leaves 1-3 m., gracefully pendent. Panicles 30-60 cm. 

 long, 10-15 cm. broad, the males broad-pyramidal, the females long- 

 linear, beautifully silvery or pinkish. Floral glumes of the male flowers 

 scarcely awned. (Fig. in Eng. & Pr. ii, 2, p. 67.) 



(Cult, in lawns ; Brazil ; Argent.) ; N. Patagon., Patagon., near source 

 of Rio Chico ; Nahual-huapi. 



2. G. PILOSUM (d'Urv. sub Arundo Cortaderia pilosa Hack.). 



Panicle contracted, subovate. Empty glumes smooth, carinate, acute, 

 as long as the spikelet. Floral glumes copiously girt with long, white 

 villi. Leaves striate, distichous, mostly exceeding the culm. Panicle 

 contracted, subovate. Glumes ' violaceous, scarious-margined. Empty 



