Notes on genera of Paniceae : I-IV . rated lemma and palea, themargins of the lemma flat. Doell (in Mart. Fl. Bras. 2 : 2173. 1877)states that iu this group of plants the caryopsis has a linear hilum, butthe specimens in the National Herbarium are not mature enough to per-mit of verification of this statement. The genus is confined to the tropicsof the western hemisphere, Brazil being the center of distribution, twospecies occurring in the West Indies. Besides Mesosetum proper the genus contains a well-marked section. First glume awnless; lower floret neuter ... Mesosetum proper.First glume aw

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Notes on genera of Paniceae : I-IV . rated lemma and palea, themargins of the lemma flat. Doell (in Mart. Fl. Bras. 2 : 2173. 1877)states that iu this group of plants the caryopsis has a linear hilum, butthe specimens in the National Herbarium are not mature enough to per-mit of verification of this statement. The genus is confined to the tropicsof the western hemisphere, Brazil being the center of distribution, twospecies occurring in the West Indies. Besides Mesosetum proper the genus contains a well-marked section. First glume awnless; lower floret neuter ... Mesosetum proper.First glume awned ; lower floret staminate . . Section Bifuria. Mesosetum proper.This contains the following species: Mesosetum rottboellioides (H. B. K.) Hitchc. Contr. Nat. Herb. 12 : 211. 1909. Based onPanicum rottboellioidesH. B. K. Panicum rottboelli-oides H. B. K. Nov.Gen. & Sp. 1 : 96. pi.32. 1816. Crescitinhumidis ripa? Orino-censis inter Maypureset montem Sipapo. Mesosetum cayen-nense Stend. Syn. PI.Glum. 1 : 118. 1854.(See above.). Fig. 3. Mesosetum rottboellioides. (Spikelet, first glume, second glume, sterile lemma and fruit x 10 diam.) Mesosetum Wrightii Hitchc. Contr.Wright 3859 no. 559961 in the U. S. Nat. Herb. 12:211. 1909.National Herbarium.This species is known only from Cuba. Mesosetum exaratum (Trin.). Panicum exaratum Trin. Gram. Pan. 160. 1826. Brasil. (Laxgs-dorff.) The type specimen, in the Trinius Herbarium, is labeledPanicum exaratum m. In pratis paludosis S. da Lapa. Brasil. leg. cl.de Langsdorff. Panicum pappophorum Nees, Agrost. Bras. 104. 1829. Habitat* * * provinciae Piaahiensis. The type specimen, in the MunichHerbarium, bearing the name and locality as published, was collected byMartius. 122 Chase—Notes on Genera of Panicetz. IV. Mesosetum loliiforme (Hochst.) Chase, Bot. Gaz. 51 : 302. 1911. Basedon Panicum loliiforme Hochst. Panicum loliiforme Hochst. in Steud. Syn. PI. Glum. 1 : 56. 1854. Herbr. Dr. Hostmann nr. 1071. The type specimen is in the her-bar