HITCHCOCK AND CHASE NORTH AMERICAN PANICUM. 115 



Venezuela: Sacupana, Rusby 6c Squires 79, 347. 



Trinidad: Hart 3293. 



Tobago: Eggers^bbM. 



British Guiana: Jenman 5969. 



Dutch Guiana: Hostmann 641 (Gray Herb.). 



French Guiana: Rotherey 14. 



Brazil: Falls of Madeira, Rusby 210 in part; Campinas, Novaes 1288; Bahia. 



Salzmann; Rio Janeiro, Widgren, Wilkes Expl. Exped. in part; without 



locality, Riedel; Piauhy, Gardner. 

 Bolivia: Mapiri, Rusby 212. 

 Paraguay: Hassler 8192 (Gray Herb.). 



60. Panicum laxum Swartz. 



Panicum laxum Swartz, Prod. Veg. Ind. Occ. 23. 1788. " Jamaica." The type, in 

 the Swartz Herbarium, is the upper part of a culm. The spikelets are 2.2 to 2.3 mm. 

 long. A specimen in the Munich Herbarium sent by Swartz as P. laxum is a species 

 of Leptochloa. 



Panicum agrostidiforme Lam. Tabl. Encycl. 1 : 172. 1791. Lamarck cites "Ex 

 Amer. merid. Communic. A. D. Richard." The type, in the Lamarck Herbarium, 

 is the upper part of a culm. 



Panicum tenuiculmum[e] Meyer, Prim. Fl. Esseq. 58. 1818. Meyer gives no par- 

 ticular locality. The type is in the Gottingen Herbarium, but the portion examined 

 is in the Trinius Herbarium, having been sent by Meyer to Trinius. 



Panicum diandrum Kunth, Rev. Gram. 2: 393. pi. 110. 1829. "Crescit in insula 

 Guadelupse inque Brasilia." The type, in the Berlin Herbarium, being the plant 

 figured, was collected in Guadeloupe by Balbis in 1844. 



Panicum leptomerum Presl, Rel. Haenk. 1 : 311. 1830. The locality was unknown 



to Presl, who gives "Hab " The type, collected by Haenke, in the Bohemian 



Museum, bears the name but no locality. 



Panicum ramulifiorum Hochst.; Steud. Syn. PL Glum. 1 : 65. 1854. This is based 

 on "PL Kappler surin. nr. 1523." Specimens of this number have been examined 

 at Munich and Leipzig, but none was found in the Steudel Herbarium. 



Agrostis nigrescens Salzm.; Steud. Syn. PL Glum. 1: 65. 1854. "Bahia." This 

 name is mentioned under Panicum ramulifiorum Hochst. as applying to a variety 

 "ramulis paniculae densiflorus." Steudel gives the name earlier, « but as a nomen 

 nudum. Salzmann specimens from Bahia, bearing this name, in the Trinius Herba- 

 rium and in the United States National Herbarium, are densely flowered forms of P. 

 laxum. 



Panicum nigrescens Salzm.; Steud. Syn. PL Glum. 1 : 66. 1854. This is given as a 

 synonym under P. laxum Swartz. Doell & also gives this name in the same way. 

 It is doubtless the same as Agrostis nigrescens, but we have seen no Salzmann specimen 

 labeled Panicum, nigrescens. 



Panicum agrostis Nees; Doell in Mart. Fl. Bras. 2 2 : 213. 1877. This is given as a 

 synonym under P. laxum Swartz, and is credited to "Nees in herb, schedulis." The 

 type, in the Berlin Herbarium, was collected in Brazil by Sello. 



Panicum laxum pubescens Doell in Mart. Fl. Bras. 2 2 : 213. 1877. The first specimen 

 cited by Doell is " Prope Santarem (Spruce 'Panicum n. 26')." The type, in the 

 Munich Herbarium, has pubescent spikelets. 



Panicum pilosum epilosum Fourn. Mex. PL 2 : 24. 1886. This appears to be founded 

 on P. agrostidiforme Lam., as this is the first synonym given. The specimens cited 

 by Fournier belong to P. laxum Swartz. 



a Norn. Bot. ed. 2. 1 : 41. 1841. &Mart. FL Bras. 2 2 : 213. 1877. 



