PIjANTS OP SOUTHERN NEW JERSEY. 191 



dd. Spikelets pubescent. 



e. Spikelets 3 mm. or more long. 



f. Blades elongated leaves 2-5 mm. wide. 



P. depouperatum, p. 198 

 ff. Blades not elongated. 



g. Nodes bearded, leaves 15-30 mm. wide. 



P. boscii, p. 211 

 gg. Nodes not bearded. 

 h. Sheaths glabrous. 



i. Spikelets 3.5-3.8 mm. long. 



P] latifolium, p. 211 

 a. spikelets 3 mm. long. 



P. commutatum, p. 208 

 hh. Sheaths pubescent. 



i. Pubescence appressed, spikelets 3.5-4. 



P. oligosanthes, p. 209 

 M. Pubescence spreading. 

 }'. Blades 20 mm. wide. 



P. clandestinum, p. 211 

 jj. Blades 6-12 mm. wide. 



P. scrinerianum, p. 209 

 ee. Spikelets less than 3 mm. long. 



f. Blades elongated. P. linearifolium, p. 198 



ff. Blades not elongated. 



g. Spikelets attenuated at the base. 



h. Autumnal blades flat, blades 80-120 X 4-8 mm. 

 P. angustifolium, p. 199 

 hh. Autumnal blades involute, blades 40-60 X 2-5 

 mm. P. aciculare, p. ipg 



gg. Spikelets not attenuated at base. 

 h. Ligule manifest l-S mm. long. 

 i Sheaths glabrous. 



/. Panicle narrow 54-/^ as wide as long. 



P. spretum, p. 202 



jj. Panicle open nearly as wide as loi^g. 



P. lindheimeri, p. 202 



JJ. Sheaths pubescent. 



j. Ligule 1-1.5 mm. long, culms and 

 sheaths appressed pubescent. 

 k. Spikelets 1.8-1.9 mm. long, plant 

 bluish green. P. tsugetorum, p. 206 

 kk. Spikelets 1.5 mm. long, nearly gla- 

 brous, plant olivaceous. 



P. oricola, p. 204 

 jj, Ligule 2-5 mm. long. 



k. Spikelets 1-1.3 mm. long, culm and 

 sheath soft appressed pubescent. 

 /. Spikelets i. 2-1.3 mm. long. 



P. leucothrix, p. 202 



