10 POACEAE. 



4. SCHIZACHYBTTJM Nees. Erect plants, tufted or from rootstocks, 

 with spike-like racemes. Spikelets in pairs at each node of the articulate and 

 frequently hairy rachis. Sessile spikelet of 4 scales, the fourth scale entire or 

 2-toothed, bearing a straight, contorted, or spiral awn. BEARD-GRASS. 



Internodes of the racemes glabrous or nearly so, the racemes hence appearing naked. 



1. 8. semiberbe. 

 Internodes of the racemes and pedicels long-clllate, the racemes 



hence appearing hairy. 2. 8. gracile. 



1. 8. semiberbe Nees. Stems tufted, 6-12 dm. tall: racemes 5-8 cm. long, the 

 rachis-intcrnodes with a dense ring of short hairs at the base, thick, channeled 

 on the inner surface: sessile spikelet with the first scale rounded on the back, 

 roughened, acuminate, the awn of the fourth scale 12-15 mm. long, geniculate, 

 tightly spiral at the base, the column exserted. Everglades and pinelands. 

 (Bah., Cuba, Ant.) 



2. 8. gracile (Spreng.) Nash. Stems densely tufted, slender, 3-6 dm. tall: 

 racemes 3-5 cm. long, silvery -white : sessile spikelet 5-6 mm. long, the awn 

 geniculate, 13-20 mm. long, tightly spiral to the bend, loosely so above, the 

 column much ezserted. Pinelands. (Bah., Cuba, Ant.) 



5. ANDBOPOOON [Royen] L. Erect plants with spike-like racemes, 

 which often protrude from the side of a membranous spathe-like sheath. 

 Sessile spikelet of 4 scales, bearing a straight contorted or spiral awn, or some- 

 times awnless. Pedicellate spikelet usually sterile, of 1 or 2 scales, some- 

 times of 4 scales and enclosing a staminate or more rarely a perfect flower, or 

 frequently entirely wanting. BROOM-GRASS. BEARD-ORASS. SAND-GRASS. 



Inforescenee oblong to oval or obovate, the branches many times divided, the lower 

 elongated, forming 1 or more corymblform masses; upper stem-leaves usually 

 , lllng or exceeding the Inflorescence. 

 Inflorescence long and narrow, commonly linear, the branches 



equalling or exceeding the Inflorescence. 1. A. tcnulsi><itli< n-. 



Inflorescence long and narrow, commonly linear, the branches 

 not much divided nor the lower ones excessively elon- 



lually snorter than the Inflorescence. 



gated, hence forming no corymblform masses; upper 

 stem-leaves usually snorter than ' 

 Sheath* and spathes not enlarged. 



I'alrs of racemes sessile or nearly so. the common 



peduncle not exceeding 5 mm. In length. 2. .4. tunpibcrbU. 



Pairs of racemes never sessile, the romm'in p ( ..liu\. !. 

 over 5 mm. In length, usually exceeding I cm. or 

 ftometlme* much exserted. 

 SI.-TII Blonder, sparingly branched: leaf-blades 8 



mm. wide or less: awns 1.5-2 cm. long. 3. A. Trac\ii. 



Stem stout, much branched above : leaf-blades 4-7 



mm. wide: awns 6-10 mm. long. 4. A. Bakcti. 



Bbeaths and spathes, at least on the upper part of the 

 stem, enlarged. 5. A. Klliottii. 



1. A. tenuispatheua Nash. Stems 5-15 dm. tall: spathes 2.5-3 cm. long, 

 fastigately crowded: racemes in pain, 1-2 cm. long, protruding from tl 



of the broad spathe: sessile spikelet 3-4 mm. long, the awn 10-15 mm. long. 

 Everglades, pinelands and hammocks. F. K. (Bah., Cuba, Ant.) 



2. A. longiberbis Hack. Stems 5-10 dm. tall, tufted: leaf -sheaths appressed- 

 hirsute: blades 5 dm. long or less, 7 mm. wide or less, those on the innovations 

 densely appressed-hirsute, those on the stem more or less so beneath, rough 

 above: spathes 3-5 em. long, usually considerably exceeding the racemes, com- 

 monly brown: racemes 8-4 cm. long, stout: sessile spikelet 4-4.5 mm. long, 

 the awn straight or nearly so, 12-16 mm. long Pinelands. F. K 



3. A. Tracyl Nash. Stems 5-8 dm. tall: spathes 4-6 cm. long, rather broad: 

 racemes 3-4 em. long, rather stout: sessile spikelet 5 mm. long, the awn 

 1.5-2 em. long. Pine lauds. 



4. A. Bakeri Rcrilm. & Ball. Stems stout, 8-12 dm. tall, tufted: leaf 

 blades tip to 4 dm. long, 4-7 mm. wide, flat; spathes 4-5 cm. long; racemes 1.5-3 



