88 



POACEAE 



Spikelets less than 1 mni. long. 

 SDikelets 1-2 mm. long. 



T.iffule .5 mm. long to almost wanting. 

 ^Blades of the primary stem-leaves, the larger 

 ones, 8-l-'i mm. wide. j, , , j 



Spikelets 1.3 ram. long: basal leaf-blades 

 equallim,' or larger than those on the 

 stem which are usually 5-7 in number 

 Soikelets 1 .5mm. long or more : basal leat- 

 ' blades smaller than those on the stem 

 which usually number 4 or less. 

 Upper surface of the blades very rough. 

 Upper surface of the blades smooth : 

 stems much-branched : sheaths m- 



Blades of the i.rimary stem-leaves, the larger 

 ones, rarelv exceeding 6 mm wide : 

 With a l:.road cartilaginous white much- 

 thickened margin. , ^ f^^O 

 Upper portion of the stem naked, the 1 



leaves below the middle. . 



Stems leafy almost to the panicle: 

 leaves "usually 3. 

 With no conspicuous white ma,rgin. 

 Leaf-blades glabrous on both surfaces. 

 Spikelets barely exceeding 1 mm. 

 long, obovoid : primary leaf- 

 blades .5-7 cm. long. 

 Spikelets 1.5 mm. long, elliptic : pri- 

 mary leaf-blades usually less 

 thaii 5 cm. long. 

 Leaf-blades i-ubescent, at least below. 

 Stems very slender, weak: stem- 

 leaves" light green. thin. spread- 

 ing, usually less than 2 cm. long. 

 Upper surface of the blades pubes- 

 cent with very long weak 

 hairs. , , , 



Upper surface of the blades gla- 

 brous. . , 

 Stem stouter: stem-leaves grayish 

 green, firm, 2-;^ cm. long. 

 Ligule of hairs 2-4 mm. long. 



Leaf-blades glabrous on the ower s^ii/Jace 

 Plant bright green : panicle broadly o\oia, 



its branches spreading. 

 Plant gravish green, the leaves purplish : 

 panicle oblong, its branches ascend- 

 ing or nearly erect. 

 Leaf-blades pubescent beneath with short 

 hairs. 

 Stems slender, glabrous. ■„ ,.;i; 



Plant bright gi'een : sheath margin dil- 

 ate with long hairs. 

 Plant grayish green; sheath margin 

 naked. 

 Stems rather stout, the lower portion 

 densely pubescent with long nearU 



erect liairs. 

 ??iSpikelets exceeding 2 mm. in length. 



Primary leaf-blades elongated, broadly linear, olttn 



2 dm. long and 1.5 cm. wide, spreading. 

 Primary leaf-1)!ades lanceolate : 

 Rounded or truncate at the base. 



Margins ciliate, at least for the lower half. 



Margins naked, or sometimes with a few haiis 



at the very base. i/ „= i,^,.cr 



Leaf-blades spreading : first scale K as long 



as the spikelet, acute. , , i„,i„. 



Stems puberulent: primary leaf-blaccs 



less than 4 cm. long : plant usually 



Stems"slabrous : primary leaf-blades 5-7 



cm long: plant usually green. 



Leaf-blades erect : first scale lir% as long as 



the spikelet. rounded at the apex. 



Cordate at the clasping base. ,„ „„ ti-,o 



Leaf-blades glabrous, sometimes ciliate on the 



Sterns^ 'puberulent : blades naked on the 



Stems'llabrous : l)lades ciliate on the margin. 



Leaf-blades pubescent. 



tt Leaf-sheaths pubescent with l<]"J^.l;"^ir^- leaf-blades 



Spikelets very strongly ai d *'li*''; '>."^.".\^'' .^h,'' te the larger 

 elongated, broadly linear or Imeiu-lanc toiatt. me ux. ^ 



ones often 2 dm. long and 1 cm. wide. 



67. P. M'rightianuni. 



91. P. crectlfoliinii. 



89. P. spliaeromrpon. 



90. P. inflatani. 



73. P. aWomarnhiiitnin. 



74. P. trifolium. 



71. P. gracilicaiilf. 



72. P. flavoidrens. 



70. P. CuthherlU. 

 69. P. ensifoUinii- 

 75. P. glabrissiiiiaiii. 



81. P. nitidiini. 

 77. P. jMucipiluin. 



81. P. iiitidum. 



76. P. longilifiulattim. 



80. /'. pan-isi>iciilniii. 



107. P. equilatcvalr. 



.52. P. Xashinnv III . 



53. P. patent ifoli II in. 

 101. P. cpilijoliuiii . 

 iA. P. Wehbcriuiuuii.' 



108. P. Aflici. 



111. P. com iiintai Kill. 



109. P. ovale. 



105. P. scahnuscidum. 



