SUMMARY 



Number of genera and species described in this book, compared 



with the number given in older floras of the Rocky Mountain 

 region.* 



Rydberg Coult. & Nels. Coulter 



1917 1909 1885 



Pinaceae 9 19 4 12 4 10 



Juniperaceae 3 8 1 6 1 4 



Taxaceae 11 ' 



Ephedraceae 1 15 13 12 



Gymnospermae 14 33 6 21 6 16 



Typhaceae 12 12 11 



Sparganiaceae 15 1 5 1 3 



ZanichelHaceae 3 24 4 16 2 12 



Naiadaceae 1 3 1 2 



Scheuchzeriaceae 2 3 1 2 2 3 



Alismaceae 2 7 2 5 2 2 



Elodiaceae 12 11 



Poaceae 78 451 65 206 48 139 



Cyperaceae 13 215 7 99 8 111 



Araceae 2 2 



Lemnaceae 2 6 2 7 2 3 



Commelinaceae 2 6 2 3 2 2 



Pontederiaceae. 2 2 1 1 



Melanthaceae 6 21 4 6 5 8 



Juncaceae 2 47 2 25 2 20 



AlUaceae 5 40 2 10 4 16 



Liliaceae 8 16 6 8 6 7 



Convallariaceae 7 17 4 7 4 6 



Dracaenaceae 3 7 1 3 1 2 



Calochortaceae 1 10 12 12 



Trilliaceae 1 2 



Smilacaceae 11 11 11 



Amaryllidaceae 2 2 1 1 



Iridaceae 3 13 2 5 2 3 



Orchidaceae 18 45 11 19 9 15 



Monocotyledones 168 749 132 435 104 357 



Salicaceae 2 90 2 40 2 20 



Fagaceae 1 17 1 7 1 2 



Betulaceae 2 19 2 5 2 4 



Corylaceae 2 3 1 1 1 1 



Ulmaceae 2 6 2 2 2 2 



Cannabinaceae 2 3 11 11 



Urticaceae 2 12 2 4 3 6 



* The columns under the heading "Rydberg" give the number of genera and spec- 

 ies admitted in tliis book; those under "Coult. & Nels." give those in the New Manual 

 of Botany of the Central Rocky Mountains, by Coulter and Nelson, 1909; and those 

 imder "Coulter," in Manual of Botany of the Rocky Mountain Region, by John M. 

 Coulter, 18S.5. The geographical area covered by the present book is, however, about 

 half larger than that of the old Coulter's Manual, and nearly twice as large as that of 

 Coulter & Nelson's. 



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