GRASS FAMILY 



Hordeum pusillum Nutt. Little Bar- 

 ley. (Fig. 530.) 



fordeitm pusillum Nutt. Gen. 1:87. 1818. 

 Culms 4 / -i5 / tall, erect, or decumbent at the 

 se, smooth and glabrous. Sheaths loose, usually 



lorter than the internodcs, smooth and glabrous, 



ic upper often enclosing the base of the spike; 

 lie very short; leaves X / ~3 / long, W~i" wide, 

 erect, smooth beneath, rough above; spike i'-3 x 

 in length; spikelets usually in 3's, the central one 



jntaining a palet and perfect flower, the lateral 



iperfect; scales awned, the empty ones scabrous, 



lose of the central spikelet and the lower ones of 



le lateral spikelets dilated above the base; flower- 



ig scale smooth, that of the central spikelet 3"- 



" long, short-awned, the corresponding scale in 



ae lateral spikelets smaller and very short-stalked. 



In dry soil, Ontario to British Columbia, south to 

 Nebraska, Arkansas. Texas and California; also spar- 

 ely introduced along the coast from Virginia to I'lor- 

 June-July. 



3. Hordeum jubatum L. Squirrel-tail Grass. (Fig. 5;: 



Hordeum jubatum I. Sj 753. 



Culms io'-2% tall, erect, simple, tuuallj 

 slender, smooth and glabrous. Sheath* uualljr 

 shorter than the internodes, generally loose. smooth 

 and glabrous; ligule ';" long or lew; leaves 

 long, i"-?" wide, erect, rough; spike a'-4' in length; 

 spikelets usually in ,Vs, the central one containing 

 a palet and perfect flower, the lateral imperfect; 

 empty scales consisting of slender rough awns i'- 

 iy 2 -' long; flowering scale of the central spikelet 

 3 // -4 // long, scabrous at the apex, bearing a slender 

 rough awn i'-2>/' long; the corresponding scak in 

 the lateral spikelets short-awned, about 3" long in- 

 cludingits pedicel, sometimes reduced toarnditnent. 



In dry soil. Ontario to Alaska, n.uth to KABM*. 

 Colorado and Califoni in the ea*t float 



Labrador and giulnc t. N< u J, : 

 July-Aug. 



4. Hordeum murinum L. Wall Hark-> : 



Hordeum mtirinttm L. Sp. PI. 85. 1753- 



Culms 6 / -2 tall, erect, or decumbent at the base, 

 smooth and glabrous. Sheaths loose, shorter than 

 the internodes on the long culms, overlapping on the 

 short ones, the uppermost often inflated and enclosing 

 the base of the spike; ligule very short; leaves I'-o 7 

 long, i "-3" wide, rough; spikes 2'-4' in length; 

 spikelets usually in 3's; scales awned, the empty ones 

 a\vn-like, scabrous, those of the central spikelet 

 broader and ciliate on the margins, bearing awns 9"- 

 12" long, those of the lateral spikelets similar, with 

 the exception of the second scale, which is not ciliate; 

 flowering scales scabrous at the apex, bearing an awn 

 about i' long, those of the lateral spikelets about 6" 

 long, the corresponding scale in the central spikelet 

 somewhat smaller. 



f On ballast and sparingly in waste places, soutlu rn Nrw 

 York and New Jersey. Also from Arizona to California. 

 Adventive or naturalized from Europe. June-July. 



