KEY TO CULTIVATED HERBS AND POTTED SHRUBS 



46 a Each spikelet surrounded by awn-like bristles 



Chaetochloa italica. p 118 

 b Spikelets not surrounded by awn-like bristles as in a. . 47 



47 a Each spikelet with a barbed awn 1-4 in. long 



Hordeum. p 118 

 b Each spikelet not with a barbed awn Phleum. p 118 



48 a Awns on at least some of the spikelets 49 



b No conspicuous awns present 51 



49 a Plant cultivated South for the grain and North only 



in greenhouses Oryza. p IIQ 



b Plants not cultivated as in a 50 



50 a Cultivated grain ; awn bent outward, at least half as 



long as the scale Avena. p 120 



b Grass sometimes sown in fields; awns short; branches 



of panicle usually stiff Dactylis. p 120 



51 a Plants cultivated South, sometimes North, for the sugary 



stem or broom-like panicles 52 



b Grasses cultivated for forage 53 



52 a Spikelets with long silky hairs; plant cultivated only 



South and in greenhouses Saccharum. p 122 



b Spikelets not with long silky hairs ; plant cultivated 



both North and South Sorghum, p 122 



53 a Panicle appears airy, much branched ; spikelets com- 



paratively fine; leaves comparatively narrow; plants 



slender Agrostis. p 121 



b Plants not completely as in a 54 



54 a Leaves narrow, less than % in. broad; spikelets 2-6- 



flowered, tapering; a tuft of small hairs at base of 



inner scale Poa. p 122 



b Leaves usually more than ^4 in. broad ; spikelets 



i-flowered Panicum miliaceum. p 121 



55 a Plants cultivated for their fleshy roots 56 



b Plants not cultivated for their roots 59 



56 a Leaves linear, tapering from a clasping base 



Tragopogon porrifolius. p 219 

 b Leaves not linear 57 



57 a Plant trailing; edible roots several to each plant 



1 porno ea batatas, p 201 

 b Plants erect; edible roots one to each plant 58 



58 a Root very acrid ; plant sparingly cultivated 



Roripa armor acia. p 158 

 b Root not acrid; plant commonly cultivated Beta, p 147 



59 a Cultivated grain; leaves triangular-heart-shaped 



Fagopyrum. p 146 

 b Plants not sown for the grain 60 



60 a Plants with prickles on the leaves and stems 61 



b Plants not with prickles on the leaves and stem 62 



84 



