GRAMINE^. (GRASS FAMILY.) 843 



.f th^axfs fu s^?l^s?i?e^- '''^'^'^^ l-co-nowered,- sessile in excavations or at tee.h 



* Spikelets solitary at nodes, 3-2-oo -flowered. Spikes thick. 

 t Spikelets edgewise to axis, lodged in an excavation. Glume 1. 



f-J LOLIUM. 2(; Spikelets 00 -flowered. Glume 5-7-nerved, nerves connivent, obtuse, 



acute, oraristate at tip. 



t t Spikelets at teeth of axis, parallel to it. Glumes 2. 

 :-'■'•. AGITOPYRUM, 21 Spikelets co -flowered. Glumeg not subulate-aristafe, iiur 



ventricose at base. Nerves of lower pale connivent at tip. 

 M HETERANTHELIUM. Spikelets of two sorts; (l)/ert.7e with 1-2, perfect fluwerot^i, 



and a stalked cluster of rudimentary ones ; (2) sterile, with only nniimentarv 



flowerets ot a single pale ; all of both sorts long-aristate. 



85. SECALE, If Spikelets 2-flowered. Glumes lanceolate-subulate, aristatc. 



86. TEITICUM. Spikelets 3-5-flowered. Glumes and lower pale ventricose at base. 



keeled. Nerves of lower pale not connivent at tip. 



87. -EGILOPS. Spikelets 3-00 -flowered. Glumes and lower pale convex, m.t keefed, 



oo-nerved, nerves not connivent at tip. 



* * Spikelets solitary at 7iodes, 1-2 flowered. Spike slender. 



-S. LEPTURUS. Spikelets 1-2-flowered. Glumes 2, of lateral spikelets placed sida 

 by side, of terminal opposite, 



- ' I'SILURUS, Spikelets 2-flowered. Glume ], at outer side of spikelet, triangular, 



very small. Fertile floweret sessile, sterile pedi celled. 



' '. -MONERMA. Spikelets 1-flowered, Glumes of lateral spikelets J, of terminal 2, 



opposite. 

 * * * Spikelets 2-3, side by side at teeth of rachis. Spikes thic/c. 

 -11. ilORDEUM. If Spikelets 3 at each joint, 1-flowered, with a rudiment Ota second 



floweret, the lateral spikelet staminate or neuter, the intermediate fertile. 

 '1 ELYMUS.. Spikelets 2 at each Joint, sessile, fertile, (ours) l-flowered, with a 



rudimentary second floweret. 



1. PANICUM, L. Panic Grass. 



Spikelets comjDressed at back, or inflated, not involucrate, 2- 

 flowered, the lower staminate or neutral, the upper perfect. Glumes 

 membranous, concave, the outer never aristate, usually much smaller, 

 sometimes obsolete. Lower pale of lower floweret usually similar to 

 upper glume, membranous, many-nerved ; upper pale nerveless, some- 

 times abortive. Pales of perfect flower coriaceous, nearly equal, the 

 lower enclosing the upper. Lodicles 2, fleshy, truncate, glabrous. 

 Stamens 3. Ovary glabrous. Styles 2, terminal, elongated, stigmas 

 feathery, exserted. Caryopsis enclosed in indurated pales, but "free, 

 somewhat compressed at back, with a dot-like hilum on ventral surface 



— Herbs with various inflorescence. 



* Spikelets arranged along one side of digitate spikes, in pairs, one sessile 

 and one pedicelled. Lower glume small or obsolete, upper pale of neutral 



floweret 0. 



1. P. §aug;uiiialc, L. -Irq-en-NajU. 2\iyyin. .3 to .8; 

 culms ascending, often rooting below. Leaves linear-lanceolate, acute, 

 more or less hairy. Spikes 3-8, linear, .05 to .2 long, erect, at length 

 spreading, often reddish, spikelets obloog-lanccolate, acute; upper 

 glume lanceolate, hairy at tip; neutral pale lanceolate, acute, H-nervcd, 



