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« 
BOTANICAL GAZETTE. 107 
were sparingly found; more common were (Znothera cespitosa, 
Nutt., and (. albicaulis, Nutt., the latter extending as far as to 
Muskoda station east of the Red river. Much more rare was (2. 
Missouriensis, Sims. Gaura coccinea, Nutt , was very abundant. 
ree species of Cactacew, Mamillaria vivipara, Haw., Opun- 
tia Missouriensis, DC., and O. Rafinesquii, Engelm., were plen- 
tiful. O. Missouriensis was first observed, in going westward, 
on the hills around. Mandan. 
The Umbelliferce were mostly represented by species of Peuce- 
danum, Cymopterus and Musenium. Of these only one, Peuce- 
danum nudicaule, Nutt., extends as far east as Minnesota. 
es 
On the Formation of Starch in Leaves. 
In a recent communication to the Arbeiten des Botanisches 
Institut, in Wurtzburg (Bd. III), Prof. Sachs gives the results of 
