36 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Spikelets 5 to 6 mm. long...................2...2.02.202200-- 156. P. teranum. 
Spikelets 2 to 4 mm. long. 
Spikelets strongly reticulate-veined, 2 to 3 mm. long; 
glabrous. 
Panicle branches long and spreading; blades pubes- 
cent or glabrous.....................2022-20--- ll. P. fasciculatum. 
Panicle branches short, appressed; blades narrow, 
pubescent. .........2...22222-20222-2022002- lla. P. fasciculatum 
chartaginense. 
Spikelets scarcely reticulate-veined or only near apex. 
Spikelets not over 2 mm. long, glabrous. ........... 10. P. reptans. 
Spikelets over 3 mm. long, pubescent. 
Rachis scabrous but not bristly................. 13. P. adspersum. 
Rachis pilose with bristly hairs. 
Plant more or less velvety, sheaths not 
papillose..........2.2..0.02222222.2. 12. P. molle. 
Plant not velvety; sheaths papillose........ 14. P. arizonicum, 
10. Panicum reptans L. 
Panicum reptans LL, Syst. Nat. ed. 10, 2: 870. 1759. No locality is here given, 
but the same specimen is described more fully by Linnzus, under the name Panicum 
grossarium, later in his list of Jamaica plants. The type specimen, in the Linnean 
Herbarium, is marked “Br”. [for Browne who sent the plant] and on the sheet the 
word ‘‘reptans” was written and then crossed out. A full discussion of the type of 
this and P. grossarium is given in another place.? 
Panicum grossarium L. Syst. Nat. ed. 10, 2: 871.1759. The type specimen is the 
same as that of P. reptans. 
Panicum prostratum Lam. Tabl. Encyel. 1:171. 1791. ‘‘ Ex Insulis Caribeeis.’’ 
The type, in the Lamarck Herbarium, is from Santo Domingo. 
Panicum caespitosum Swartz, Fl. Ind. Occ. 1: 146.1797. ‘Habitat in pascuis 
siccioribus Jamaicae.’”’ The type,¢ in the Swartz Herbarium, is from ‘‘Jamaica, 
Swartz.” 
Panicum insularum Steud. Syn. Pl. Glum. 1: 61. 1854. “Ins. Antillae minores.”’ 
The type, in the Steudel Herbarium, is labeled ‘“‘Panicum insularum Steud. An- 
tillae minores. Hohenacker,”’ 
Brachiaria prostrata Griseb. Abh. Ges. Wiss. Géttingen 7: 263.1857. Based on 
Panicum prostratum Lam. 
Panicum aurelianum Hale in Wood, Class-book ed. 3. 787.1861. ‘Damp soils, 
about N. Orleans (Hale).’’ We have not been able to locate the type of this, but in 
the herbarium of the Missouri Botanical Garden there is a specimen of P. reptans 
bearing a ticket reading “‘ Panicum aurelianum New Orleans Dr. Hale.’’ This agrees 
perfectly with Hale’s description. 
Panicum prostratum pilosa[um] Eggers, Fl. St. Croix & Virgin Isl. 104. 1879. “‘St. 
Croix (La Grange).’’ We have not seen the type. The description applies to the 
common form of P. reptans with pilose rachises. 
a Amoen. Acad. 5: 392. 1759. 
6 Hitchcock, Contr. Nat. Herb. 12: 119. 1908. 
¢ For an account of Swartz’s American grasses, which are preserved in the Natural 
History Museum at Stockholm, see Hitchcock, Contr. Nat. Herb. 12: 138. 1908. 
