GENUS 104. 



GRASS FAMILY. 



3. Hordeum jubatum L. Squirrel-tail Grass. 

 Fig. 696. 



Hordeum jubatum L. Sp. PI. 85. 1753. 



Culms io'-2i tall, erect, simple, usually, slender, 

 smooth and glabrous. Sheaths usually shorter than 

 the internodes, generally loose, smooth and glabrous ; 

 ligule i" long or less; blades i'-5' long, i"-2" wide, 

 erect, rough ; spike 2 f ~4 in length ; spikelets usually 

 in 3's, the central one containing a palet and perfect 

 flower, the lateral imperfect ; empty scales consisting 

 of slender rough awns i'-2*' long; flowering scale 

 of the central spikelet $"-4" long, scabrous at the 

 apex, bearing a slender rough awn \'-2\' long; the 

 corresponding scale in the lateral spikelets short- 

 awned, about 3" long including its pedicel, sometimes 

 reduced to a rudiment. 



In dry soil, Ontario to Alaska, south to Illinois, Texas 

 and California. Naturalized in the east from Labrador 

 and Quebec to New Jersey and Pennsylvania. July-Aug. 



4. Hordeum murinum L. Wall or Way Barley. Way Bent. Fig. 697. 



Hordeum murinum 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; blades i'-6' long, 

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

 usually in 3's ; scales awned, the empty ones awn-like, 

 scabrous, those of the central spikelet broader and 

 ciliate on the margins, bearing awns g"-i2" long, those 

 of the lateral spikelets similar, with the exception of 

 the second scale, which is not ciliate ; flow r ering scales 

 scabrous at the apex, bearing an awn about i' long, 

 those of the lateral spikelets about 6" long, the corre- 

 sponding scale in the central spikelet somewhat smaller. 



On ballast and sparingly in waste places, Massachusetts 

 to District of Columbia. Also from Arizona to Utah, Cali- 

 fornia and British Columbia. Adventive or naturalized 

 from Europe. Wild- or Mouse-barley. Squirrel-tail. 

 June-July. 



5. Hordeum Pammelii Scribn. & Ball. 

 Pammel's Barley. Fig. 698. 



H. Pammelii Scribn. & Ball, la. Geol. Surv. Suppl. 

 Rep. 1903: 335. /. 237. 1904. 



Perennial. Culms 2-3 tall; leaves glabrous; 

 sheaths smooth, shorter than the internodes ; 

 blades 4'-8' long, 2"-4" wide, rough ; spikes 3'-6' 

 long, io"-i5" in diameter; lateral spikelets nearly 

 sessile, each with a perfect flower, the central 

 spikelet with 2 perfect flowers, the empty scales 

 subulate, long-awned, the flowering scales lanceo- 

 late, about 3" long, exclusive of the awn, which is 

 two to three times their length. 



On prairies, Illinois to South Dakota and Wyoming. 

 July and Aug. 



