66 



POACEAE 



45. BtJLBILIS Raf. Buffalo Grass. 



Creeping, stoloniferous, dioecious perennials. Staminate spikelets 2- or 3- 

 flowered, crowded m 2 rows on one side of the short, flattened rachis, in small 

 spikes. Empty glumes 2, membranous, lanceolate. Lemma similar. Pistillate 

 spikelet 1-fiowered. First empty glume membranous, usually small, the second 

 largest, hrm concave at the base, 3-lobed at the apex. Lemma narrow, nearly 

 hyaline, enclosing a broad, 2-nerved, convolute palet. Styles distinct, long; 

 stigmas elongate, short-plumose. 



1. B. dactyloides (Nutt.) Raf. Stoloniferous perennial; stems bearing the 

 staminate flowers 1-3 dm. high, erect, exceeding the leaves, glabrous: those 

 bearing the pi.stillate flowers 1-10 cm. long, shorter than the leaves; leaves 2-10 

 cm. long, 1-2 mm. wide, papillose-hirsute; staminate spikelets 2 or 3, approximate, 

 0.5-1 5 cm. long; spikelets 4-5 mm. long, flattened, 2-3-flowered; pistillate 

 spikelets in the axils of the leaves, ovoid, the empty glumes indurate. Buchloe 

 dactyloides (^utt.) Engehn. Plains and prairies: Minn.— Ark.— Tex — N M — 

 N.D.; Mex. Plain— Submont. Je-Jl. 



46. SCLEROPOGON Phihppi. 



Dioecious perennial herbs with tufted rootstocks. Spikelets in narrow 

 panicljs, very unhke. Staminate spikelets compressed, linear, many-flowered; 

 empty glumes nearly equal, lanceolate; lemma 3-toothed at the apex or entire, 

 about equalling the glumes and the palet. Pistillate spikelets cylindric, 3-5- 

 flowered; glunies lanceolate, the upper larger; lemma cylindric, rigid, enveloijing 

 the palet, 3-lobed and 3-a\yned. » ^ ' J e, 



1. S. Karwinsky anus (Four n.) Bonth. Stems ascending, 1-3 dm. high, 

 g abrous; leaf-blades firm, flat, 1-4 cm. long, 1-2 mm. wide; inflorescence spike- 

 ike; staminate spikelets 2-5 cm. long, 7-25-flowered ; empty glumes 7-8 mm. 

 long; lemma abnost as long, slightly 3-toothed at the apex and awn-pointed; 

 pistillate spikelets few-flowered; empty glumes very unequal, 7-14 mm. long; 

 lemma about 1 cm^ long, with three awns often 5-6 cm. long. Dry plains: Tex. 

 —Colo.— Ariz.— Mex. Son. My-0. 



47. PHRAGMITES Trin. Reed, Cane-grass. 



Tall perennials with long creeping rootstocks. Leaves broad and flat, 

 bpikelets numerous m large terminal jmnicles, 3-several-flowered, the lower 

 flower stanamate the rest perfect; rachiUa articulated between the flowers 

 and covered with long hairs. Empty glumes keeled, narrow, acute, the first 

 much shorter than the second. Lemma similar, long-acuminate, 3-neived. 

 Palet hyaline, much shorter, 2-keeled. Styles short; stigmas plumose. 



agmites 

 5-4 



5-5 



ample; pikelets numerous; lemma 10-12 mm. long, long-acuminate. F. corn- 

 mums Trin. Swamps: Newf.-Fla.-Calif.-B.C; Max., W. Ind., Eurasia. 

 I^latn — buhmont. Au-0. 



48. MUNROA Torr. False Buffalo Grass. 



Low prostrate herbs, dichotomously branched and fasciculate at the nodes. 

 ^^ft?i% f ' ^iS' J' «i-o^^ded at the nodes and at the ends of the branches. 

 Spikelets few almost sessile in the axils of the leaves and almost concealed in 



?lif i'™'f ^^- ^^J'^l. ^^™^^ ^>'^^'"«' nerveless, acute. Lemmas larger, 

 Pn^erivJf ''"^ <?f ^-t^^t'i^^^ §t tl^e apex, the upper one or two often sterile, 

 plumose Grain free""""^ Styles elongated; stigmas barbellate or short- 



squarrosa (Nutt.) Torr. Stems 1-2 dm. long; sheath short and in- 



1. M 

 flated. lo 



spreading, scabrous, pungent; spikelets 2-5-flowered; empty glumes shorter than 

 the lemma, which is about 5 mm. long, 3-toothed and awn-pointed. Dry plains : 

 Sask.—S.D.— Tex.— Ariz.— Alta. Plain-Submont. Au-0 



