164 PATAGONIAN EXPEDITIONS I BOTANY. 



i. P. CHLOROLEUCUM Griseb. 



Rush-like perennial, branching at the base, 30-40 cm. tall, ascending, 

 glaucous-white, woolly at nodes and ligules. Leaves arcuate, as long as 

 the culm, linear-acuminate, convolute, hairy. Panicle patent, 12 cm. long, 

 its branches woolly, paired or solitary, racemiform or branched. Sterile 

 glumes 3, equal, ovate, acute, 5-y-nerved, slightly exceeding the 5-angled 

 compressed obtuse floral glume. N. Patagon. (Argentina). 



(P. lachnanthum O. Ktze. (Torr.) = Anthcenantia lanata Benth.) 



2. P. MAGELLANICUM Lam. 



Spikes filiform, fasciculate. Glumes pediceled, oblong, acute, very 

 slender. 

 Magellan. 



3. P. URVILLEANUM Kth. (P. patagonicum Hier.) 



Perennial with branching base, glaucous white, and ascending culms, 

 60 cm., hard, distichously leafy at base. Nodes glabrous or villous. 

 Leaf-sheaths velvety, with reversed hairs, 15 cm. long, i cm. broad; lam- 

 ince 25-55 cm - by 4-5 mm., linear-acuminate, -terete, not scabrid. Ligule 

 densely villous. Panicle patent, with triquetrous alternate racemiform 

 branches, sucessively long and short. Spikelets velvety, subsecund. 

 Sterile glumes 3, ovate, hairy on back, the lowest 5-7-nerved, the second 

 i3-nerved, the third y-g-nerved, with a neutral flower. Floral glume 7- 

 nerved, coriaceous. 



(Chili; Argent.) ; N. Patagon., by Rio Negro and the coast. 



7. SETARIA Beauv. {Chamaaphis R. Br., Ixophorus Schl.) 



Annuals with spike-like panicle, awnless, but with awn-like branches 

 projecting above the spikelets. Glumes 4 ; i small, 2 and 3 equal or 3 

 larger, all membranous ; the third enclosing a male or neuter flower ; the 

 fourth, or. flowering glume, enclosing the perfect terminal flower, is firm, 

 and at length indurated along with the palea about the grain. 



Species 35, in warm and temperate regions. 



i. S. GLAUCA Beauv. Yellow Foxtail. 

 (Ixophorus glaucus in Brit. & Br. i, 126.) 



30-60 cm. high. Leaf-sheaths smooth, loose, the lower compressed, 

 reddish ; lamince flat, scabrous, twisted. Spike simple, cylindrical, tawny 



