244 PATAGONIAN EXPEDITIONS I BOTANY. 



S. Patagon., by R. Sta. Cruz. 



B. UNIOLOIDES HUMILIS Speg. 



Dwarf, 10-15 cm. high, glabrous. Leaves narrow, short, subrigid. 

 Culm erect, few-flowered. Spikelets 4-5-flowered, shining. 

 S. Patagon., by RR. Gallegos and Sta. Cruz. 



B. UNIOLOIDES MICRANTHUS Speg. 



Variety slender, tall and glabrous ; panicles narrow, erect ; spikelets not 

 nutant, small, 3-4-flowered (8-10 mm. by 3 mm.), compressed and pale 

 green. Glumes and palece acute, not awned. 



Patagon., Chubut, in marshy woods. 



55. LOLIUM Linn. Darnel. 



Flat leaves, and terminal, often long, spikes; spikelets solitary, sessile 

 and alternate in the notches of the rachis ; compressed with their edge 

 towards the rachis ; having each only i empty ghime, except the terminal 

 spikelet which has 2. 



Species 6, of the Old World ; introduced to Amer. 



I. L. BRASILIANUM NeCS. 



Root repent, with leafy fascicles. Culms ascending, 15-45 cm. high, 

 simple, compressed, above retrorsely scabrous. Leaves linear, plane, 

 acuminate. Spike nearly muticous (5-15 cm.) ; spikelets 5-io-flowered. 

 Floriglumes acute, the upper short-setulose below their apex. Perennial. 



(Brazil) ; N. Patagon., in elevated places near Rio Negro. 



2.^ L. PERENNE Linn. Ryegrass. 



Root perennial. Empty ghime shorter than the 8-i5~flowered spikelet; 

 floral glume awnless or shortly awned. 



(Eur., nat. in N. Amer., Brit. & Br. i, 225.) 

 Magellan (Dusen) ; Falklands, on sandy shores. 



3. L. TEMULENTUM (Desv.) Hack. Bearded Darnel. 



Root annual. Empty ghime as long as the 5-7-flowered spikelet ' ; awn 

 1 2 mm. long, exceeding the flower. The seeds have a narcotic poison. 

 (Eurasia; N. Amer.) Magellan. (Dusen.) 



