340 CONTRIBUTIONS FEOM THE NATIONAL HEEBAEIUM. 



(Montagne, Grosmond). Originally described from Virginia. The type of Pan- 

 irvm gihbnm is from South Carolina, that of Panicum aquaticum from Bermuda. 



2. Sacciolepis vilvoides (Trin.) Chase, Proc. Biol. Soc. Washington 21: 7. 1908. 

 Panicum vilvoides Trin. Gram. Pan. 171. 1826. 



Hymenachne fluviatiUs Nees, Agrost. Bras. 273. 1829. 



A tall aquatic glabrous perennial with succulent unbranched culms and 

 elongate linear blades; panicles about 8- mm. wide and 15 to 50 cm. long. 



Swamps, Cuba (Pinar del Rio, Isle of Pines) and northern South America. 

 Oi'iginally described from Brazil, the type of Hymenachne fluviatiUs also from 

 Brazil. 



3. Sacciolepis myuros (Lam.) Chase, Proc. Biol. Soc. Washington 21: 7. 1908. 

 Panicum myuros Lam. Tabl. Encycl. 1: 172. 1791. 



Panicum myosurus Rich. Act. Soc. Hist. Nat. Paris 1 : 106. 1792. 



Hymenachne myurus Beau v. Ess. Agrost. 49, 165. 1812. 



Panicum phleiforme Presl, Rel. Haenk. 1: 302. 1830. 



Similar to S. vilvoides in habit but annual, the blades mostly narrower, the 

 r.i nicies compact, spikelike, about 5 mm. thick. 



Swamps and wet places, Mexico, Cuba (Isle of Pines), and Trinidad (Piarco 

 Savanna, Pitch Lake) to South America. Originally described from tropical 

 America, the type being from Cayenne. Panicum myosurus was also described 

 from Cayenne; Panicum- phleiforme from ]\Iexico and Luzon. Grisebach * mis- 

 applies the name Hymenachne fluviatiUs to this species. 



40. HYMENACHNE Beauv. 



Spikelets short-pedicellate in long dense spikelike or interrupted panicles; 

 spikelets acuminate ; lemma and palea scarcely indurate, the margins of the 

 lemma flat, the palea not inclosed above. 



Inflorescence dense, spikelike 1. H. amplexicaulis. 



Inflorescence long and narrow with ascending branches, not spikelike. 



2. H. auriculata. 



1. Hymenachne amplexicaulis (Rudge) Nees, Agrost. Bras. 276. 1829. 

 Panicum amplexicaule Rudge, PI. Guian. 1: 21. pi. 27. 1805. 

 Agrostis monostachya Poir. in Lam. Encycl. Suppl. 1: 256. 1810. 

 Panicum hymenachne Desv. Opusc. 82. 1831. 



A glabrous aquatic perennial with succulent sparingly branching culms, 

 broad linear cordate-clasping blades, the panicles about 8 mm. thick and 20 

 to 50 cm. long. 



Swamps and shallow water, often forming pure colonies, Tropics and Sub- 

 tropics of both hemispheres. Originally described from British Guiana. The 

 type of Agrostis monostachya and Panicum hymenachne is from Porto Rico. 

 Grisebach^ misapplies the name Hymenachne myurus to this species. 



Cuba, Jamaica, Haiti, Santo Domingo, Porto Rico, Guadeloupe, Dominica, 

 Martinique, and Trinidad. 



2. Hymenachne auriculata (Willd.) Chase, Proc. Biol. Soc. Washington 21: 5. 



1908. 

 Panicum auriculatum Willd. in Spreug. Syst. Veg. 1: 322. 1825. 

 Panicum polystachinim Presl, Rel. Haenk. 1: 312. 1830. 

 HymcHdchne patula Fourn. Mex. PI. 2: 37. 1886. 



*F1. Brit. W. Ind. 553. 1864. 



