and Feather-man's list in 1870 and that of Langlois in 1887 

 only included portions of the State, consequently a very 

 lariM' iiiuubiT <>t' species are here recorded for the first time 

 as occurring in Louisiana. 



The geographic position of Louisiana makes the plant 

 distribution of peculiar interest, for not only does its situ- 

 ation on the verge of the tropics make it the northern bound 

 any line of many southern plants and the southern boundar) 

 line of many northern plants, but it is equally on the boundary 

 line of* the Eastern and Western divisions of the continent, so 

 that here again many Eastern species have their Western 

 limit, and many Western species their Eastern limit, the 

 number of this last division being particularly large. 



While it is not possible to say of each species exactly 

 what its limits are, the following seem to be undoubted in- 

 stances of each of the above named divisions : 



(I) Grasses which have their northern limit in Louisiana. 

 — Panicum leucophaeum, Panicum pyriforme, Panicum albo- 

 marginatum, Panicum pseudanceps, Panicum manatense, Pani- 

 cum paspaloides, Luziola Peruviana, Aristida palustris, Erio- 

 clrfoa punctata, Paspalum conjugatum, Paspalum vaginatum. 



(II) Grasses which have their southern limit in Louisiana. 

 — Panicum Roanokensc, Panicum nitidum, Panicum filmiculme, 

 Brachyelytrum erectum, Agrostis. perennans, Holcus lanatus, 

 Dactylis glomeratus, Panicularia fluitans, Pohjpogon Mons- 

 peliensis. 



(III) Grasses which have their western limit in Louisi- 

 ana. — Echinochloa longearistata, Panicum verrucossum, Pani- 

 cum lanuginosum, Panicum. Joorii. Ccnclirus machroccpJialvs. 

 Hydrochloa fluitans, Stipa avencea, Sporobolus Drummondii 

 Danthonia sericea, Gymnopogon brevifoUus. 



(IV) Grasses that.have their eastern limit in Louisiana. 

 — Amphilophis exaristata, Paspalum li rid ton. I 'us /ml um Drum- 

 mondii, Panicum platyphyllum, Panicum Helleri, Bonteloua 

 hirsuta, Tridens Tc.ranus. LeptocJdoa imhricata, L< ptochloa 

 Nealleyi, Diplachnc Halei. 



There are many other instances, but these arc sufficient 

 to show that Louisiana is the meeting ground of these four 

 divisions of the Flora of the continent. It is also interesting 



