ORDER 155. GRAMINE^E. 



391 



18. MILLIUM, L. MILLET G. Spikelets awn- 

 less, consisting of 2 coriaceous pales enclosed in 

 apparently 2 glumes, which are longer. (But the- 

 oretically the glumes are as in Paspalum.) Sta. 3. 

 Grain coated by the pales. Panicle open. 



OT. efTusnm L. (a) Culm erect, 3 8f ; Ivs. flat, smooth ; 

 pan. diffuse, 69' long; spkl. oblong, (c) scattered, acute 

 1". Woods, Can. to 111. and Pa. Summer. 



19. AMFHICARPUM, KunUi. Spikelets appar- 

 ently 1-flwd., and perfect as in Mill him, but of two kinds ; 

 the terminal deciduous and sterile, the radical under 

 ground, and fertile. Gl. and pales sub-equal, lanceolate, 

 acute. Panicle strict, erect. Radical fls. larger, solitary. 

 A. Purehii K. (/) Culm If, erect; Ivs. erect, hairy; sheaths 



hairy, the upper leafless ; pan. on a long exported peel. ; & spike- 

 'ets H" long, the 9 radical, 2J", the grain terete, same length. 

 Barrens, N. J., and S. Aug. 



20. PANICUM, L. PANIC G. Glumes 2, unequal, 

 awnless, the lower much smaller. Fls. 2, dissimilar, the 

 lower of 1 or 2 pales, neutral or $ ; the upper 5 of 2 



equal cartilaginous polished, concave, awnless pales coating the gram. 

 Sta, 3. Stig. 2, plumous, purple. Spikelets in 

 simple or compound panicles. 



Spikelets acute, or acuminate, very numerous, racemcd 



in large panicles. ..(*) 

 Spikelets obtuse, or barely acute, solitary, pedicillatc, 



uot numerous.. .(**) 



* Abortive fl. neutral, consisting of one pale., .(a) 



* Abortive flower neutral, of 2 pales... (6) 



* Abortive flower $ , of 2 pales. Culms erect, 



terete, with one pankle Nos. 10, 11 



a Panicle ample, capillary, spikelcts single ( 



on capillary pedicels Nos. 1, 2 I 



a Panicle not capillary, dense-flowered No. 3 



b Lower glume as long as the upper, 2", both 



3- veined , 



b Lower gl. very short, the upper 3-5-veined, 1" or less Nos. 5, 6 



b Lower gl. very short, upper 7-9-veinecl, not tumid Nos. 7, 8 



upper 11-veined, tumid at base, 2" No. 9 



** Abortive flower neutral, consisting of a single pale Nos. 12, 13 



** Abortive flower of 2 pales, the upper small and pcarions.. .(c) 

 c Leaves narrow (1 5" wide), obscurely veined... (c?) 

 c Leaves broad, 520" wide, conspicuously veined., .(x) 



d Spikelcts silky-fringed. Lower glume obsolete. s Fl. colored No. 11 



d Spikelets glabrous, or merely pubescent. Lower glume small. . .(e) 



e Spikclcts less than 1" long, round-oval. Glume 5-veined. . . .No?. 15, 1fi 

 t Spikeleti 1 1J" long, oval. Gluiuc 9-vcincd IN oe. 17. IS 



No. 4 



