10 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Ichnanthus glaber (Raddi) Hitclic. (Navicularia glabra Raddi, Agrost. 

 Bras. 39. 1823; Panicum navicularia Nees, Agrost. Bras. 136. 1829). This 

 species has been confused with Ichnanthus nemoralis but differs in having 

 narrowly lanceolate blades, glabrous sheaths (including margin), and an open 

 panicle with slender branches and pedicels. The appendages of the fertile 

 lemma are distinctly different, being firm and rather thick, gradually narrowed 

 to a blunt point, extending above the base of the palea for 0.5 mm. and united 

 below to the base of the fruit for about the same distance. The appendages 

 of /. nemoralis and its allies are thin membranaceous wings. The notes here 

 given are from a specimen collected by J. N. Rose on Corcovado, Rio de Janeiro, 

 Brazil (no. 20181). The type of Navicularia glabra, collected "in saltibus 

 montosis prope Rio-janeiro," has not been examined, but the specimen above 

 cited agrees perfectly with Raddi's description. 



There is an Ichnanthus glaber Link * mentioned as a synonym under Panicum 

 glaberrimum Steud. The name has no taxonomic standing, as it was not prop- 

 erly published. 



8. Ichnanthus leiocarpus (Spreng.) Kunth. 



Panicum leiocarpon Spreng. Neu. Entd. 1: 243. 1820. " Hab. in Brasilia." 

 Navicularia Janata Raddi, Agrost. Bras. 40. 1823. " In herbidis prope Rio- 

 Inhumirim," Brazil. This is given as a synonym of Panicum leiocarpon by 

 Nees, 2 who probably saw Sprengel's type at Berlin. Raddi describes and figures 

 the glumes and sterile lemma as pubescent at apex, a character which is not 

 mentioned by Sprengel. Sprengel's type has been examined ; the spikelets are 

 obscurely pubescent at apex but not bearded as stated by Raddi. As I have 

 not seen Raddi's type, Navicularia lanata is included here somewhat doubtfully. 

 Ichnanthus leiocapus Kunth, Rev. Gram. 1 : Suppl. X. 1830. Based on Pani- 

 cum leiocarpon Spreng. 



DESCRIPTION. 



Culms 1 to 2 meters tall, pubescent ; sheaths villous or lanate ; ligule a ciliate 

 membrane, the hairs 1 to 2 mm. long ; blades narrowly lanceolate, 10 to 20 cm. 

 long, 1 to 3 cm. wide, pilose on both surfaces ; panicle large and open, about 

 30 cm. long, obovoid, the axis villous below, scabrous above, the branches 

 spreading, pubescent at base, these and the branchlets somewhat flexuous; spike- 

 lets about 4 mm. long, glabrous; first glume about half as long as spikelet; 

 fruit narrow, brownish, 3 mm. long, the appendages about 1 mm. long. 



DISTRIBUTION. 



Trinidad to Brazil. 

 Trinidad : Bot. Gard. Herb. 3318. 

 Brazil: Bahia, Riedel 183. Rio Janeiro, Beyrich. 



9. Ichnanthus mexicanus Fourn. 



Ichnanthus mexicanus Fourn. Mex. PI. 2: 34. 1886. "Trapiche de la Con- 

 cepcion [Oaxaca] (Liebm. n. 457)." The type, in the Copenhagen Herbarium, 

 is the terminal part of a culm with a panicle and one or two leaves. The 

 description below is drawn from this specimen. 



1 Steud. Syn. PI. Glum. 1 : 94. 1854. 

 "Agrost. Bras. 147. 1829. 



