340 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
(Montagne, Grosmond). Originally described from Virginia. The type of Pan- 
icum gibbum 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 fluviatilis 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 em. long. 
Swamps, Cuba (Pinar del Rfo, Isle of Pines) and northern South America. 
Originally described from Brazil, the type of Hymenachne fluviatilis also from 
Brazil. 
8. Sacciolepis myuros (Lam.) Chase, Proc. Biol. Soc. Washington 21: 7, 1908. 
Panicum myuros Lam. Tabl. Encyel. 1: 172. 1791. : 
Panicum myosurus Rich. Act. Soc. Hist. Nat. Paris 1: 106. 1792. 
Hymenachne myurus Beauv. 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 
panicles 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 Mexico and Luzon. Grisebach? mis- 
applies the name Hymenachne fluviatilis 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 amplezicaule Rudge, Pl. Guian. 1: 21. pl. 27. 1805. 
Agrostis monostachya Poir. in Lam. Eneycl. Suppl. 1: 256. 1810. 
Panicum hymenachne Desv. Opusce. 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 Porte 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 Spreng. Syst. Veg. 1: 322. 1825. 
Panicum polystachyum Presi, Rel. Haenk. 1: 312. 1830. 
Hymenachne patula Fourn. Mex. Pl, 2: 37, 1886. 
* Fl. Brit. W. Ind. 553. 1864. 
