GRAMINE^. 440 ANTHOXANTHUM. 



caryopsis, each with an external, accessory palea or abortive 

 rudiment at base. 



1. P. arundina'cea. L. p. Americana. Torr. 

 Stem erect, sparingly branched, 2 — 5 feet high ; leaves spreading, lanceolate, 



nerved, rough-edged, on smooth, striate sheaths ; panicle oblong, spicate, 

 somewhat secund, 2 — 4 inches long; ^/?wwes 3-nerved, whitish, scabrous ; 

 rudiments pilose. Common in ditches and swamps. July. Aug. 



/3. picta is the well known striped or ribbon grass, with beautil'ully variega- 

 ted leaves longitudinally striped in endless diversity. Cultivated. 



2. P. Canarie'nsis. Canary Grass. 



Stem erect, or geniculate at the lower joints, round, striate, leafy ; leaves 

 lanceolate ; panicles spicate, ovoid, erect ; glumes whitish, with green nerves ; 

 rudiments smooth. Fields and pastures. Introduced. July. Ann. 



22. HOLCUS. 

 Spikelets 2-flowered ; ghimes herbaceous, boat-shaped, 

 mucronate ; flowers pedicellate, the lower one perfect and 

 awnless. upper one staminate or neuter, awned on the back. 



H. lana'tus. Soft Grass. 



Hoary pubescent ; stem 1^—2 feet high; ZeffDc.9 lanceolate, 2 — .5 inches 

 long ; sheaths striate ; panicie oblong, dense, whitish with a purple tinge ; 

 Howcrs shorter than the glumes, sterile one with a recurved, included awn. 

 Common in wet meadows. Very soft with whitish down. Jl. 



23. HIERO'CHLOA. 

 Spikelets 3-flowered ; glumes 2, scarious; lateral flowers 

 staminate, triandrous ; central flower perfect, diandrous (rare- 

 ly triandrous). 



1. H. borea'ms. Seneca Grass. 



Smooth, glossy ; stem simple, erect, 1.5 — 20 inches high ; radical leaves as 

 Ion o- as the stem, cauline 2 — 4 inches long, lanceolate, mucronate ; panicle 

 rather I -sided and spreading, pyramidal, few-flov^^ered, 2 — 3 inches long; 

 i;-a?ic/(/e/s flexuous ; spikelets hro-dd, subcordate, colored, unarmed ; lower 

 palea ciliate. Wet meadows. Very fragrant. May. 



2. H ai.pi'na. 



Smooth ; stem erect, stout, C — S inches high ; leaves linear-lanceolate, acute ; 

 sheaihs tuinid, longer than the internodes ; panicle ovoid, 1^ — 2 inches long, 

 with the branches in pairs ; spikelets purple, compressed, large, longer than 

 the branches; glumes lanceolate ; lower Jiower with an awn about as long as 

 the palese. Summits of the While Mts. Bic. Jn. 



24. ANTHOXA'NTHUM. 

 Spikelels 3-flowered, the central one perfect, the 2 lateral 

 ones neuter, each consisting of one bearded palea; glumes 2, 

 unequal, the upper one larger, enclosing the flowers; palece 

 of the perfect flower 2, short, awnless ; stamens 2. 



A. odora'tum. Sweet-scented Vernal Grass. 



Stem fc;lender, erect, 12 — 18 inches high ; leaves short, striate, pale green ; 

 panicle spicate, oblong-ovoid ; spikelets pubescent, on short peduncles ; palea 

 ef the lateral fiowers linear-oblong, ciliate on the margin, one of them with a 



