GRASS FAMILY 



31 



stem glabrous. 



liacliilla bearing the rudimentary glumes and awns glabrous; second glume 



strongly papillose-hispid on the keel. 3. B. hirsuta. 



Rachilla bearing the rudimentary glumes and awns with a tuft of Igon 



hairs at the apex; second glume scabrous and sparingly long-ciliate on 



the keel. 

 Spike solitary; tufted annual. 

 Spikes 12 or more; spikelets in each few, less than 12. 



44. LEPTOCHLOA Beauv. 



45. BtJLBILIS Raf. Buffalo Grass. 



46. SCLEROPOGON Philippi. i 



47. PHRAGMITES Trin. Reed, Cane-grass. 



48. MUNROA Torr. False Buffalo Grass. 



49. BLEPHARIDACHNE Hack. 



50. TRIPLASIS Beauv. Sand-grass. 



51. DASYOCHLOA WiUd. 



52. ERIONEtjRON Nash. 



53. TRIDENS R. & S. 



Second empty glume 1-nerved. 

 Second emptj glume 3-5-nerved. 



54. DIPLACHNE Beauv. 



55. REDFIELDIA Vasey. Blow-out Grass, Sand-grass. 



56. KOELERIA Pers. June Grass. 



57. ERAGROSTIS Beauv. 



4. B. gracilis. 



5. B. procumbens. 



6. B . curtipendula . 



1. L. filiformis. 



I. B. dactyloides. 



S. Karwinskyanus . 



1. P. Phraymilex. 



1. M. squarrosa. 



1. B. Kingii. 



I. T. purpurea. 



1. D. pulchella. 



1. E. piloaum. 



1. T. muticus. 



2. T. elonnatus 



1. D. acuminata. 

 1. R. flexuosa. 

 1. K. gracilis. 



Stink-grass, Skunk-grass. 



Plant extensively creeping, rooting at the nodes; plant dioecious. I. E. hypnoides. 



Plant not creeping, not rooting at the nodes; flowers perfect. 



Annuals, much branched, ascending or decumbent and geniculate at the base. 



Spikelets about 3 mm. broad; first empty glume only slightly shorter than the 



second. 2. E. megdstachya. 



Spikelets 1.5-2 mm. broad; first empty glume only two-thirds as long as the 

 second. 

 Inflorescence open; branches at last more or less spreading; spikelets dark 

 green or lead-colored. 3. E. Purshii. 



- Inflorescence narrow; branches erect or strongly ascending; spikelets light 

 yellowish green. 4. E. lutescens. 



Perennials, rigid, erect, often tufted. 



Spikelets scattered on the long branches. 



Branches of the panicle widely spreading in age. .5. E. peclinacea. 



Branches of the panicle erect or strongly ascending. 



Spikelets 3-9-flowered, on pedicels much longer. 6. E. Irichodes. 



Spikelets 8-15-flowered, on pedicels scarcely as long. 7. E. neo-mexicana 

 Spikelets clustered on short branches. 8. E. secundiflora. 



58. CATABROSA Beauv. Brook-grass. i. C. aquaiica. 



59. SPHENOPHOLIS Scribn. 



Second empty glume much wider than the lemma, rounded or truncate and somewhat 

 cucullate at the apex. 

 Intermediate nerves of the second glume almost as prominent as the lateral ones; 

 leaf-blades firm, much broader than the sheaths and therefore with prominent 

 auricles. 1. S. robusta. 



Intermediate nerves of the second glume faint, the lateral ones strong; leaf-blades 

 soft, not much wider than the sheaths; auricles not prominent. 2. S. obtusala. 

 Second empty glume oblanceolate, not much wider than the lemma, obtuse or acute. 

 Second empty glume rather firm, as well as the lemma obtusish. 3. S. intermedia. 

 Second empty glume thin and with a broad, scarious margin, acutish ; lemma acute. 



4. S. pallens. 



60. MELICA L. Melic-grass. 



Lemma notched at the apex, awned. 



Lemma neither notched nor awned. 



Lemma attenuate at the apex. 



First empty glume 4 mm. long; second 5-6 mm. long. 



First empty glume 6 mm. long; second about 8 mm. long. 



I. M. Smithii. 



M. subulata. 

 M. Pammelii. 



