36 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Spikelete)s'to 6 mm. long: 2 2)22-= = wea esate er eee 15. P. texanum. 
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 clibrousis ote heer aaa eee oe ll. P. fasciculatum. 
Panicle branches short, appressed; blades narrow, 
PUDCECENE fs ssesees a eeu! Le meee ane ee 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 
VE PUNTO REL sts (he 22 ye eee see ene 12. P. molle. 
Plant not velvety; sheaths papillose.-...... 14. P. arizonicum. 
Y 10. Panicum reptans L. 
Panicum reptans L. 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 Linnzan 
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. Encycl. 1:171. 1791. ‘‘ Ex Insulis Caribzeis.’’ 
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 miziores.”’ 
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. 
ee Af aes aff a. Lith Mr. P60, 
(9 2-9 Kaedac Ca Se 
