ORDER 155. GRAMLNEJ3. 



391- 



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

 less, consisting of 2 coriaceous pales enclosed in 

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

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

 Grain coated by the pales. Panicle open. 



Iff. cll'usiim L. (a) Culm erect, 3 8f; Ivs. flat, smooth : 

 pan. diffuse, 6 9' long; spkl. oblong, (c) scattered, acut 

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



19. AMPHICARPUM, Kunth. Spikelets appar- 

 ently 1-flwd., and perfect as in Millium, 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. Purshii K. (/) Culm If, erect; Ivs. erect, hairy; sheaths 



hairy, the upper leafless ; pan. on a long exserted ped. ; $ spike- 

 'f;ts H" long, the 9 radical, 2^", 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 $ 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, racemed 



in mrge panicles. . . (*) 

 Spikelets obtuse, or barely acute, solitary, pedicillate, 



not numerous... (**) 



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



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



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



terete, with one panicle Nos. 10, 11 



a Panicle ample, capillary, spikelets single 



on capillary pedicels Nos. 1, 



a Panicle not capillary, dense-flowered No. 



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



3-veined ...No. 4 



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



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



tipper 1 1-veined, tumid at base, 2" No. 9 



* * Abortive flower neutral, consisting of a single pale Nos. 1*2, 13 



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

 c Leaves narrow (15" wide), obscurely veined... (d) 

 e Leaves broad, 5 20" wide, conspicuously veined., .(x) 



d Spikelets silky-fringed. Lower glume obsolete. 5 Fl. colored No. 14 



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



e Spikelets less than 1" long, round-oval. Glume 5-veined Nos. 15, 10 



Spikelets \--\\" long. oval. Glume 9-vcincd Nos. 17. IS 



d 



