rire abe ha 
Seren ee 
r ° lie oe 
Pies Fon, Booth ih, & es ® = 
vo ¥ ig a 
Rie ae PAD _ Be feo 
94 Mr. Geyer’s Plants of Illinois and Missouri. 
rs 
7 aa a bie. A : 
Mr. Geyer, who is an dereliene ollector, i is now absent on an ¢ 
expedition to the Rocky Mountains and Oregon, as announced i 
‘> the last volume of this Journal, (p. 226.) Being unwilling t 
ie adopt the common plan of selling his collections to subscribers 
a _ before they are actually made, he prefers to seek some needfu 
x aid in the prosecution of his arduous undertaking, by. offering t 
: the botanical public sets of the following plants, collected in 184 
= near St. Louis, Missouri, and around Beardstown on the Illinoi 
River. This collection (which is duly mentioned on p, 227 0 
Vol. xtv,) consists of the following species. 
4 1. Ranunculus micranthns, Nutt. Apparently common in tl 
7 grassy river bottoms, and on fori grassy hills in Missouri anc 
>| Iinois. It is very near F. abortivus, but apparently well distin 
* guished by its pubescence, and the more orbicular, very ee 
cordate or reniform lowest leaves. > . 
8). 8 Rananci ris, Muhl. 
3. -Myosuras minimus, Linn. Certainly a native sides * 
* We now ought to be careful observers of such plan as are apparently com 
mon to both continents: in afier years it will be much more difficult to decid 
which are natives and which introduced. Many European plants, now common 
weeds east of the Alleghany Mountains, have not yet found their way to the Mis- 
sissippi valley, but undoubtedly will arrive in a short time. Other plants are h 
“ady as common as they are in Europe, from whence they were derived, or in 
middle Asia, perhaps their original home, It behooves us therefore to note the 
progress of these intruders, and distinguish from them the true natives. 
We are able to distinguish several different classes of such plants : 
1. Nearly allied ig sarge species, where one takes the place of the other ia 
the other continent; such as Quercus ra in ata America, and Q. pedunculata 
in Europe; Carpinu en ‘oat? 3 Polygonum Pena (n. sp. P, 
mite, Pers.) and P. mite, Schra Sane aevitlentalis: bi ; 
pus sinuatus and L. Ticrépeniie oa many others. 
2. Geegraphical varieties, where no specific distinction can be discovered be 
tween the natives of both continents, but where the American and European va- 
te prise can always be Wear cnt: by some points of minor importance. Such are 
Sium latifoli 
. , Circea lutetiana, Siasdhit Valerandi, (if it does not belong to the 
. first =e) Castanea vesca, Lapin ruderale, Astragalus hypoglottis, Eriaphorem 
minimus, 
es 3. Identical plants, true ‘altie of both continents, especially arctic or at least 
northern — also ‘marine oe and cryptogamic beaut ol e. & Potentill 
x was ~ ee by 
he os ag weber Qo Man heat J AY, a a oy 20 
ma sy ee set ‘ z a oh te O oe 
: Sferines ase ho Se ks ae ? 
