240 PATAGONIAN EXPEDITIONS I BOTANY. 



Beautiful with its long ligules ; habit of F. antarctica Kth. 

 Staaten I., Fuegia; rare in maritime, rocky places. 



54. BROMUS Linn. Bromegrass. 



Leaves flat, the sheaths often closed. Panicles exserted, the pedicels 

 thickened above ; the rachilla articulated between the floral glumes. 

 Spikelets large, several-flowered. Chimes unequal, the empty glumes not 

 awned, or the second sometimes with a short awn ; floral glume longer, 

 5~9-nerved, the apex hyaline, bifid, the midnerve produced as an awn; 

 palea as long, its two keels ciliate. Stamens 3 or fewer. Styles short, 

 lateral. Grain adhering to the palea. 



Species 40, in temperate regions. Brit. & Br. i, 219. 



KEY TO THE SPECIES. 



A. Spikelets i-4-flowered, plant robust, with rather broad, long leaves. 



Rays in 5's, each i-3-spiculate. Spikelets 13 mm. long. patagonicns. 



A2. Spikelets 2-6-flowered, 12-25 mm - l n g. tne flowers not imbricate. Awn jointed and 



twisted. Cespitose, 60 cm. tall. trinii. 



A$. Spikelets 4-7(1 2)-flowered. 



b. Spikelets 5-flowered, with short awns. Culms about 25 cm. 



c. Panicle simple, its rays i-spiculate; spikelets to 15 mm. Leaves linear, velvety. 



Floriglumes 5 -nerved. pellitus. 



c2. Panicle 4-spiculate ; spikelets longer than their pedicels, purplish. Leaves puberu- 



lous ; floriglume silky. picttts. 



b2. Leaves hairy or rough. 



c. Culm 10 cm.; leaves narrow, convolute-setaceous. Spikelets 1-3, each 6-i2-flow- 



ered. Floriglume 9-nerved, awn rather long. macranthus. 



c2. Culm 50 cm.; leaves linear. Panicle nutant, rays mostly in twos. Spikelet 5-6- 



flowered. Floriglume g-nerved, with short straight awn. hcenkeanus. 



CT>. As hcenkeanus, but spikelets 4-5 -flowered, and floriglumes /-nerved. andimts. 



4. Culm 75 cm. ; leaves flat. Panicle rays 2-3-spiculate. Floriglume 14 mm., very 



acute, short-awned or awnless. uniolaides. 



3. Leaves glabrous, flat. Culms i meter tall. Awns short. 



c. Stout, nodes all subbasal. Leaves linear. Panicle 18 cm. long, rays 2-spiculate. 



Spikelets 2 cm., green and violet, 4-6-flowered. Floriglume 16 mm. long, 7- 



nerved. hackeli. 



c2. With woody rhizome. Leaves lanceolate, rough-edged. Panicle 30 cm. long ; rays 



i-3-spiculate. Spikelets violet to white, variegated. Empty glumes short. 



coloratus. 

 I. B. ANDINUS Phil. 



Culms i meter high, smooth ; leaves and sheaths except the lowest gla- 

 brous ; leaves plane, with a long ligule. Panicle 25 cm. long, few-flow- 



