GRASS FAMILY 23 



Loinmas entire or at most 3-lobed. 



Hairs on the rachilla or the lemma very long and enclosing the latter. 



47. PHR.\GMITE3. 

 Hairs, if any, on the racliilla and the lemma shorter than the latter. 



Stigmas barbellate on elongated styles; spikelets in three.s in the axils of spinescent 



leaves. 48. Munroa. 



Stigmas plumose, sessile or on short styles. 

 Lemma 1-3-nerved. 



Lateral nerves of the lemmas hairy. 

 Lemma deeply 3-lobed. 



Internodes of the rachilla long, often half as long as the lemma; 



plants without stolons. 50. Tripl.\sis. 



Internodes of the rachilla short, many times shorter than the lemmas. 

 Fertile flower one, with 2 empty lemmas below and one above. 



49. Blepharidaciixe. 

 Fertile flowers 3 or more, with no empty lemmas below. 



51. Dasydchloa. 

 Lemma entire or slightly 2-lobed; internodes of the racliilla short. 

 Inflorescence a short congested raceme; leaf-blades with thick car- 

 tilaginous margins. 52. Erioneurox. 

 Inflorescence a panicle; leaf-blades not with cartilaginous margins. 

 Panicle simple or compound, the spikelets on pedicels of vary- 

 ing length. 52. Tridens. 

 Panicle composed of long branches, along which the appressed 

 spikelets are arranged on short pedicels. 54. Dipl.achxe. 

 Lateral nerves of the lemmas glabrous. 



Callus of the lemma copiously pubescent with long hairs; panicle open 



55. Redfieldia. 

 Callus of the lemma glabrous. 



Second empty glume similar to the first one or nearly so. 



Panicle narrow, dense and spike-like, sliining; its" branches erect. 



56. Koeleria. 

 Panicle open; its branches spreading. 



Rachilla continuous (except in E. megaslachya); lemma decidu- 

 ous; palet persistent; plants of dry soil. 



57. Eragrostis. 

 Rachilla articulated; lemma and palet both deciduous with 



the rachilla-internodes ; water plants with 2-flowered 

 spikelets. 58. Catabrosa. 



Second empty glume very unlike the first one, broad at the summit . 



59. Sphenopholis. 

 Lemma 5-many-nerved. 



Spikelets with two or more of the upper glumes empty, broad and enfold- 

 ing each other. 60. Melica. 

 Spikelets with upper glumes flower-bearing or narrow and abortive. 

 Stigmas arising at or near the apex of the ovary. 



Spikelets borne in one-sided fascicles which are arranged in a glom- 

 erate or interrupted panicle; lemma herbaceous. 



61. Dactylis. 

 Spikelets borne in panicles or racemes. 



Glumes more or less compressed and keeled. 



Spikelets cordate, large. 62. Briza. 



Spikelets not cordate. 



Plants dioecious; lemma of the pistillate spikelets cori- 

 aceous; palet strongly 2-keeled and serrate on the 

 margin. 63. DiSTlCHLis. 



Plants with perfect flowers or in some species of Poa dioe- 

 cious; spikelets all alike; lemma tliin; palet ciliate 

 or smooth on the margin. 

 Lemma scarious-margined ; rachis glabrous or with 



webby hairs. 64. Poa. 



Lemma membranous, not scarious-margined; rachis 

 with stiff hairs, extending into a hairy appendage. 

 35. Graphephorum. 

 Glumes rounded on the back, at least below. 



Lemma with a basal ring of hairs, prominently 7-nerved, 



toothed at the apex. 65. Scolochloa. 



I.,emma naked at the base. 



Lemma obtuse or acutish and scarious at apex, usually 

 toothed. 

 Lemma distinctly 5-7-nerved; style present. 



66. Panicularia. 

 Lemma obscurely 5-nerved; style none. 



67. Puccinellia. 

 Lemma acute, pointed or more commonly awned at apex. 



Stigmas bilaterally pluino.se; flowers hermaphrodite. 



68. Festuca. 

 Stigmas subplumose. the branches arising on all sides; 



plant dioecious. 69. Hesperochlo.\. 



Stigmas plainly arising below the apex of the ovary which is tipped by 

 a hairy cushion. 70. Bromus. 



Tribe 10. HORDEAE. 

 Spikelets usually single at the nodes of the rachis. 



Empty glumes broad, with their sides turned to the rachis. 



