GRAMINEjE. 541 



Sect. 1. Eupaspalum. — Spikelets devoid of an involucre. 

 § 1. Spikelets 2-seriate. Palea placed against the axis. 



63. P. compressum, Ns. I Stem compressed, 1-2-node, often branched above ; 

 leaves long, flat, usually ciliate : sheath flat-compressed; spikes 2-3(-"5"), two approxi- 

 mate : axis 3-gon;il, flat on the back, glabrous, narrower than the spikelets ; spikelets 2- 

 seriate, shortly pedicellate, ovate-lanceolate with a bluntish point, pubescent at the margin 

 or glabresceut : exterior sterile glumes obsoletely 5-nerved, inferior 4-nerved near the mar- 

 gin. — Trin. Ic. t. 118. — Milium, Sw. P. platycaule, Poir. P. extenuatum, Ns. {ex Ft. 

 Spruce.) P. guadalupense and macropodon, Steud. P. Michauxianum, Kth. (P. Digitaria, 

 Poir.) : a form with longer glabrous spikelets. — l'-lV high ; leaves 6"'-4"' broad, lowest 

 shorter and narrower; spikes 4"-2", spikelets 1'" (or 2'" long in P. Michauxianum). — Hab. 

 Jamaica!, March, Wits., common in pastures; Antigua!, Wullschl., Dominica!, Imr. ; 

 Trinidad !, Cr. ; [Southern United States ! to Buenos Ayres !]. 



§ 2. Spikelets 2-seriate. Fertile convex glume placed against the axis. 

 * Sterile glumes 2- or enerved. 



64. P. conjugatum, Berg. Stoloniferous ; leaves flat, ciliate : sheath compressed ; 

 spikes 2, divergent, both at the summit of the stem (or 2-3 with the third distant) : axis 

 linear, channelled on the back, glabrous, about as broad as the spikelets ; spikelets 2-seriate, 

 very shortly pedicellate, roundish ovate, minutely pointed, somewhat villous at the margin -. 

 sterile glumes 2-nerved within the margin. — Trin. Ic. t. 102. — P. ciliatum, Lam. P. longis- 

 simum, llochst. P. Sieberianum and Renggeri, Steud.! — 1'-2' high; leaves 4"'-3'" broad; 

 spikes 4"-2", spikelets i'" long. — Hab. Jamaica!, all coll., common; S. Kitts !, Els., An- 

 tigua !, Wullschl., Dominica !, Imr. ; Trinidad !, Sieb., Cr.; [Louisiana ! ; Cuba ! to Brazil ! , 

 Galapagos ! to Australia ! ; trop. Africa !]. 



65. P. pusillum, Vent. Stoloniferous ; stem low, inflexed ; leaves short, flat, glabres- 

 ceut, as long as the internodes ; spikes 2-5, most approximate : axis linear, fiat on the back, 

 glabrous, narrower than the spikelets ; spikelets 2-seriate, shortly pedicellate, roundish, 

 blunt, glabrous: sterile glumes enerved within the margin. — Trin. Ic. t. 273. — P. serpens, 

 PL Sprue— 3"-G" high ; leaves 6"'-12'" long, V"-W" broad ; spikes 6"'-S"' long: spike- 

 lets ^"' diam. — Hab. Trinidad!, Cr. ; [Portorico and Mexico to Brazil !]. 



** Sterile glumes Z-o-nerved. 



66. P. distichum, L. Rhizome creeping; leaves convolute or conduplicate (rarely 

 flat), usually glabrous (except at the base) ; spikes 2, one terminal, the lateral approxi- 

 mate : axis linear, flat on the back, glabrous, narrower than the spikelets ; spikelets 2-se- 

 riate, shortly pedicellate, ovate, pointed, glabrous : sterile glumes 3-5-nerved. — Spikes 1"- 

 2", spikelets 1"'-1V" long. 



a. Stem slender ; leaves narrow, linear-acuminate, convolute : sheath biconvex. — Trin. 

 Ic. t. 112. — P. litorale, R. Br. Digitaria paspaloides, Dub. {non Mich.) 



&. vaginatum, Sw. ! Stems creeping or ascending from the leafy branched base; leaves 

 lanceolate-acuminate, conduplicate (or flat) : sheath loose, compressed. — Trin. Ic. t. 120. 



Hab. Jamaica !, all coll. (a, /3), common in pastures and wet places ; Antigua !, Wullschl. 

 08) ; Trinidad !, Sieb. ; [Bermudas ! and United States ! to Buenos Ayres !, Chili ! and Juan 

 Fernandez ! ; naturalized in South-western France ! (o) ; East Indies !, Australia]. 



67. P. notatum, Fliigg. Rhizome creeping ; stem simple, erect, or ascending ; leaves 

 lanceolate-acuminate, flat, superior shorter: sheath compressed; spikes 2, one terminal 

 the other approximate : axis linear, flat on the back, glabrous, narrower than the spikelets ; 

 spikelets 2-seriate, ovate-roundish or ovale, blunt, glabrous : sterile glumes 3-5-nerved. — 

 Sw. Obs. t. 2.f. 1. Trin. Ic. t. 114. — P. distichum, 'Sw. {non L. : for Linnseus's descrip- 

 tion is to be referred to the preceding allied species). P. Michauxianum, Steud. in PI. 

 Philippi, 410 {non Kth.).— Leaves 4'" broad ; spikes 2"-l", spikelets 1"'-1V" long.— Hab. 

 Antigua !, Wullschl. ; Trinidad, Cr. /'[Southern United States; Cuba ! to Uruguay]. 



68. P. filiforme, Sw. (non Fliigg.) Rhizome csespitose ; stem slender, erect, about as 

 long as the long, filiform, glabrous leaves; spikes single^-" 3"), slightly incurved .- axis 3- 

 gonal convex on the back, glabrous, narrower than the spikelets ; spikelets 2-serial, ovate 



2n2 



