22 POACEAE. 



Plants without long rootstocks : leaves with elongate erect blades. 



Panicle-branches whorled : spikelets 2.5-3 mm. long. 1. 8. gracilis. 



Panicle-branches scattered : spikelets 1.5-2 mm. long. 2. S. anf/ustiis. 



Plants with long rootstocks: leaves with short spreading blades. 3. S. virginictis. 



1. S. gracilis (Trin.) Merr. Stems tufted, 3-6 dm. tall: leaf -blades filiform, 

 the basal 1.5-3 dm. long, those on the stem few, 2.5-8 cm. long: panicle 7-lS 

 cm. long, open: spikelets 2.5-3 mm. long, purple, the empty scales very unequal, 

 the flowering scale equalling the second and the obtuse palet. — Pinelands. 



2. S. angustus Buckl. Stems 3-12 dm. tall : leaf-blades 2-6 mm. wide, atten- 

 uate into a long slender point, the basal ones 2-3 dm. long: panicle 1-4 dm. 

 long: spikelets 1.5-2 mm. long, crowded on the short panicle-branches: second 

 scale oblong to ovate, about i the length of the spikelet. — Hammocks and 

 roadsides. — F. K. {Ber., Bah., Cuba, Ant.) 



2. S. virginicus (L.) Kunth. Stems 1.5-6 dm. tall: leaf -blades 2.5-20 cm. 

 long, 4 mm. wide or less at the base, distichous, involute on the margins and at 

 the summit: panicle 2.5-8 cm. long, 4-10 mm. wide: spikelets 2-2.5 mm. long. 

 — Hammocks. — F. K. (Ber., Bah., Cuba, A7it.) 



27. SPAP,TINA Schreb. Erect or decumbent plants with the spike-rachis 

 extending beyond the spikelets. Spikelets sessile or nearly so, much crowded and 

 imbricate. Scales 3, firm-membranous, the 2 outer keeled, the flowering scale 

 equalling or a little longer and broader than the second scale. — Marsh-grass. 



First scale less than % as long as the second : spikes usually few, erect or ascending. 



1. S. juncea. 

 First scale about % as long as the second : spikes numerous, 



appressed. 2. S. junciformis. 



1. S. juncea (Michx.) Willd. Stems often stout, 5-12 dm. tall: leaf -blades 

 1.5-6 dm. long, involute, erect or ascending: spikes 2-8, 2.5-5 cm. long: 

 spikelets 7-10 mm. long. — Hammocks along Bay Biscayne. — (Ber.) 



2. S. junciformis Engelm. & Gray. Stems rigid, often slender, 3-10 dm. tall: 

 leaf -sheaths thick, hard, the lower ones shining; blades involute, 5 dm. long or 

 less: panicle 1-2 dm. long, narrow, strict: spikelets about 7 mm. long. — Ever- 

 glades.— F. K. 



28. CAPRIOLA Adans. Stoloniferous plants, the stems as well as the 

 stolons often creeping. Spikelets small. Scales 3, the 2 outer persistent, thin, 

 keeled, the flowering scale membranous, broader, its keel ciliate. 



1. C, Dactylon (L.) Kuntze. Stems 1-3 dm. tall, from long creeping and 

 branching rootstocks: leaf -blades 2.5-5 cm. long, 2-4 mm. wide: spikes 1-5 cm. 

 long: spikelets 2 mm. long. — Hammocks and pinelands, and cultivated grounds. 

 Nat. from Eu., and cultivated. — F. K. (Ber., Bah., Cuba, Ant.) — Bermuda 



GRASS. 



29. EUSTACHYS Desv. Erect plants with the spikes single or in pairs, 

 or 3-many and digitate. Spikelets usually 1-flowered, sessile. Scales 4, rarely 

 5, the 2 lower persistent, the remaining scales firmer than the empty scales. 



Spikes usually 4-6, n.rely more : second scale of the spikelet manifestly 2-toothed at 

 the apex : leaf-blades usually 3-7 mm. wide. 1. E. petraea. 



Spikes 10-25 : second scale of the spikelet truncate at the apex : leaf- 

 blades usually 1 cm. wide or more. 2. E. glauca. 



1. E. petraea (Sw.) Desv. Stems 3-11 dm. tall: leaf-blades 3 dm. long or 

 less: spikes erect, 4-11 cm. long: scales 4, the second 1.5-1.75 mm. long, the 

 awn about 0.5 mm. long: third scale about 2 mm. long, the awn short or want- 

 ing: fourth scale 1.3-1.5 mm. long. — Pinelands. — F. K. (Ber., Bah., Cuba, Ant.) 



2. E. glauca Chapm. Stems 6-15 dm. tall: loaf -blades 2.5 dm. long or less: 

 spikes 6-15 cm. long: scales 4: second scale 1.5 mm, long, the awn about 0.3 



