4 Chase — Notes on Genera of Panicese. II. 



which are erect, forming a dense spike-like panicle, or narrowly ascend- 

 ing; spikelets lanceolate, acuminate; first glume % to 3^ ;IS long as the 

 spikelet, remote, a distinct stipe below the second glume ; sterile lemma 

 5-nerved, acuminate, exceeding the lanceolate stramineous fruit; lemma 

 and palea membranaceous, margins of the lemma thin ( not broad and 

 hyaline), not enrolled; palea not inclosed above; grain oblong, at ma- 

 turity readily falling from the open lemma and palea. Perennial aquatic 

 or semi-aquatic grasses, decumbent at base and rooting at the lower nodes, 

 with rather stout simple stems and long lanceolate blades cordate-clasping 

 at base, except in Hymenachne monlana. Species seven or eight, con- 

 fined to the tropics and subtropics. 



* Panicles elongated, spike-like. 



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

 based on the next. 



Panicum amplexicaule Rudge 1805, PI. Guian. 1: 21. t. 27. Type "ex 

 herb. Rudge" in the British Museum. 



Agrostu monostachya Poir. 1810, Encyc. Suppl. 1 : 256. (See note above 

 on type. ) 



Panicum Hymenachne Desv. 1831, Opus. 82. Based on Agrostis mono- 

 stachya Poir. 



Panicum myuros of authors not Lam. 



In the tropics and subtropics of western hemisphere. 



Hymenachne patula Fourn. 1881, Mex. PI. Gram. 37. "Bejucal in 

 insula Cuba (Liebm. n. 402. )" 



A specimen of this number from Founder is in the herbarium of the 

 Botanical Garden at Copenhagen. The panicle is less dense than in the 

 preceding. 



Known only from Cuba. 



Hymenachne pseudo-interrvpta C. Muell. 1861, Bot. Zeit. 19 : 333. 

 " India orientalis, Bengalia et Malacca. Griffith." 



Specimens in the National Herbarium from India, Malacca and Java 

 answer to Mueller's description. They differ from H. amplexicaulis in 

 having blades narrowly cordate at base, long-attenuate or involute above; 

 and in the longer spikelets with longer-pointed glumes. Nees' descrip- 

 tion of P. auritum Presl (ex Nees 1829, Fl. Bras. 2: 176) seems to apply to 

 this species, but we have not seen the type of either. 



Hymenachne Montana Griseb. 1879, in Goett. Abb. 24 : 307. "C 

 [" C = Prov. Cordoba und Santiago del Estero." 1. c. 4.] S. Achala." 

 The type is in Grisebach's herbarium at Gottingen, labeled "Achala, 

 Hieronymus 640." 



An anomalous species, bearing about the same relation to the typical 

 species that Panicum Chapmanii Vas. and related forms bear to Eupani- 

 cum. A few of the lower spikelets are subtended by a scabrous bristle 

 (a sterile pedicel) ; first and second glumes sub-equal, much shorter than 

 the sterile and fertile lemmas; fruit as in the type species, except that it 

 is slightly indurated. 



Argentina. 



