PLANTAE LINDHEIMERIANAE. 125 
will be some 50 sets for distribution, of which about 35 are 
fairly full. This last collection of Mr. Lindheimer is there- 
fore about as large as all the others together and duplicates a 
considerable number of their species. The more recent her- 
baria will consequently be fortunate in thus being able to 
secure representatives of this early Lindheimer set of exsic- 
catae. 
It appears to have been the original plan of Engelmann 
and Gray to give a number to each different species collected, 
but this was abandoned largely in the later fascicles and, in 
the present paper, a number has been assigned to each sepa- 
rate collection, as far as possible, thus ensuring a single lo- 
cality and date for each, while the whole has been printed on 
the label itself, instead of merely the number, as was the 
case with Fascicles I-IV, where the information was supposed 
to be supplied by the publication of Plantae Lindheimerianae 
and often several different collections of a species were 
issued under a single number. Unfortunately this publica- 
tion was left incomplete at the end of the Compositae 
(Bentham & Hooker sequence) for Fascicles III and IV, 
so that there have been no data given for numbers 449-574 
(Fase. III) and 652-754 (Fasc. IV), as found in various 
herbaria, and these will be supplied in the present paper, 
as far as the numbered specimens in the Engelmann her- 
barium permit. Unfortunately the existence of these numbers 
beyond 651 of the Plantae Lindheimerianae was not discovered 
till the printing of the labels of the 1849-1851 collection was 
so far advanced as to make renumbering impracticable, so 
that the numbers 652-754 are duplicated in Fascicles IV and 
V, but this need cause no confusion, as the dates and different 
form of label will readily distinguish each in herbaria, while 
the difference in the orders covered (Lobeliaceae-Marsiliaceae 
of Fasc. IV and Ranunculaceae-Leguminosae of Fasc. V,— 
B. & H. sequence) will enable the two to be distinguished 
even in publication. 
A certain confusion has also arisen through authors quoting 
not only the exsiccatae numbers but also Lindheimer’s col- _ 
lection numbers, when these happened to be on specimens 
examined in the Engelmann herbarium, or occasionally found 
