HITCHCOCK AND CHASE—-NORTH AMERICAN PANICUM. 115 
VENEZUELA: Sacupana, Rusby & Squires 79, 347. 
TRINIDAD: Hart 3293. 
Topaco: Hggers 5534. 
British GUIANA: Jenman 5969. 
DutcuH Gurana: Hostmann 641 (Gray Herb.). 
Frencu Guiana: Rotherey 14. 
Brazit: 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. 
Bortvia: Mapiri, Rusby 212. 
ParaGcuay: Hassler 8192 (Gray Herb.). 
ve 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 aculm. The spikelets are 2.2 to 2.3mm. 
long. A specimen in the Munich Herbarium sent by Swartz as P. laxwm 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 G6ttingen Herbarium, but the portion examined 
is in the Trinius Herbarium, having been sent by Meyer to Trinius. 
Panicum diandrum Rene Rév. Gram. 2: 393. pl. 110. 18). “Crescit in insula 
Guadelupe 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 ramuliflorum 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 Salam.; Steud. Syn. Pl. Glum. 1: 65. 1854. ‘‘Bahia.’’ This 
name is mentioned under Panicum ramuliflorum 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 asa 
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?: 213. 1877. This is given asa 
synonym under P. laxwm Swartz, and is credited to ‘‘ Nees in herb. schedulis.’’ The 
ee in the Berlin Herbarium, was collected in Brazil by Sello. 
“Panicum laxum pubescens Doell in Mart. Fl. Bras. 2?: 213.1877. The first specimen 
| cited by Doell is ‘“‘Prope Santarem (Spruce ‘Panicum. n. 26 an “7. lve eye in the 
~ Munich Herbarium, has pubescent spikelets. = tn 1 Ahh, 
~~ Panicum pilosum onal 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@Nom, Bot. ed. 2. 1: 41. 1841. b Mart. Fl. Bras. 22: 213. 1877. 
