498 PROCEEDINGS OF THE AMERICAN ACADEMY. 



formes, glabrae, superiores l)re\es, circa 2 cm. longae, patente 

 papilloso-pilosae, abrupte ad folii junctionem contractae. Ligula 

 membranucea, brevissima, 0.25 mm. longa. Folia erecta, rigidiuscula 

 linearia, svibtus plana apicem versus involuto-setacea, 5-14 em. longa, 

 1-2 mm. lata, lamina utrinque papilloso-pilosa. Paniculae terminales, 

 solitariae vel per oecasionem cum secunda breviori ex axe eodem pro- 

 ducta, breve exsertae vel ad basin inclusae, plerumque bractea parva 

 setiforme suffultae, circa 1 cm. longae, 2-4 mm. diametro, 5-7-spicu- 

 latae, axe pedicelloque scabris. Spiculae obtusae, tiu'gidae, pauUura 

 ad basin attenuatae, 2 mm. longae, circa 1.5 mm. latae, valde nervatae; 

 gluma prima quam spicula duplo brevior, 3-nervata, acuta; gluma 

 secunda 9-nervata, lemma sterile 9-nervatum aequans; fructus ellip- 

 soidalis, acutus, circa 1.7 mm. longus, 1 mm. latus, pauUum glumam 

 secundam et lemma sterile superans. — Type (in the Gray Herb.) and 

 only specimen seen, low pine ridge, Ycacos Lagoon, March 5, 1907, 

 M. E. Peck, no. 681. This species belongs to the small section Trnrra 

 as characterized in Hitchc. & Chase, Contr. U. S. Nat. Heri). 15: 97 

 (1910). It is very similar to P. strnodes Griseb. and P. caricoidrs Nees, 

 but differs from the former in haA'ing pilose culms, sheath and leaves 

 and larger spikelets; from the latter it differs very noticeably in the 

 absence of long stiff hairs on the pedicel. 



Panicum triciianthum Nees, Agrost. Bras. 210 (1829). — Open 

 ground, Toledo, March 27, 1907, M. E. Peck, no. 775. The Peck 

 specimen is rather stouter and the spikelets slightly lai'ger than usual. 



Panicum trichoides Sw. Prodr. Veg. Ind. Occ. 24 (1788). — Clear- 

 ing near Manatee Lagoon, January 27, 1906, M. E. Peck, no. 314; 

 open ground, Toledo, February 2, 1907, M. E. Peck, no. 637. 



Panicum virgatum L. Sp. PI. ed. 1, 1: 59 (1753). — Swamp near 

 IManatee Lagoon, July 18, 1905, 31. E. Peck, no. 73; swamp near 

 Manatee Lagoon, August 13, 1905, 3/. E. Peck, no. 123. 



Panicum (§ Ptychophyllum) crus-ardeae Willd. ex Nees, Agrost. 

 Bras. 253 (1829).— Forest, upper Moho R., October 18, 1906, M. E. 

 Peck, no. 565. The proper position of the section PtychophyUum seems, 

 to be very uncertain. By some it is considered a section of Setaria 

 while by others it is retained in Panicum. As this species has never 

 been transferred to Setaria, I am maintaining the old name though 

 presumably its affinity is more with Setaria than Panicum. 



Ichnanthus fallens (Sw.) Doell in Mart. Fl. Bras. 2'-: 290 (1877). 

 — Forest near Manatee Lagoon, October 18, 1905, M. E. Peck, no.. 

 172; forest near Manatee Lagoon, January 27, 1906, M. E. Peck, no,. 

 312. 



