_ Statistics of the Flora of the Northern” States. 213 
The numerical elements of our Pheenogamous flora, consid- 
ered as to classes, are, as the tabular view shows: 
Dicotyledones or Exogense, 1490 ies in 522 genera. 
Monocotyledonex or Endogene, 601 Te 159 ee 
> 
Total Phenogamous indigenous plants, 2091 « ty il 
Or about 24 Dicotyledonous to one Monocotyledonous species. 
Their distribution among the 132 eS 
in our flora (Resedacee and Dipsacee of the above table being 
\ 
List of the principal Phenogamous Natural Orders represented in the 
ora of Northern United States, arranged according to the number of 
indigenous species they severally comprise 
Species | Species. 
Composite, 278 Liliacee, 24 
about 4th of the 2091 Phanerogamia. Rubiaceze, 23 
yperaceze, about zyth, “ 213 Saxifragacez, 22 
Graminee, about qth, * ce bGs Polygonacez, “ 92 
Leguminose, about sith,“ 91 Asclepiadacen, == 21 
Rosacew, about sisth, “ 71 Melanthacex, 21 
Ericacez, L 62 Conifers, 20 
Scrophulariacez, 54 Violacee, Hypericace, and 
Orchidacee, 51| Smilaces, each 18 
Ranunculacez, 49 Primulacee, Borraginacez, 
Labiate, 49 and Naidace, each 6 
Crucifer, 46 Convolvulacee and Urticacer, 
Umbelliferze, + 387 eac 5 
Onagracez, 36 Polygalacee, 13 
Caryophyllacew, 30 Lobeliaceze, Lentibulaceee, Pole- 
Euphorbiacez, 28 moniacez, and Alismacew,each, 12 
Caprifoliacez, _ 27 Cornacee, and Hydrophyllaceee, 
Juncacer, 26) each, . i 
Cupuliferse, 25 Sapindacere, Aquifoliaceee, Che- 
Salicaces, ; 24; nopodiacer, and Betulacee, 
Gentianacee, 24; each, F 10 
Only 46 of our orders have 10 or more indigenous species: 63 
orders have from 2 to ies, and 28 orders are represented 
each by a single species. The average allows 15:09 species to 
Phzenogamous plants. In the present case the first nine families, 
having 1026 species, lack nineteen of making half; the sum of 
ten families exceeds the moiety by thirty. The result is nearly 
the same as that brought out by De Candolle from a similar 
schedule, tabulated by him from Beck’s Botany of the Northern 
