XXVl INTRODUCTION. 
Rich = _ Richard. Tourn. =  Tournefort. 
Salisb. Salisbury. Trin. Trinius. 
Schk. Schkuhr. Tuck. : Tuckerman. 
Schrad. Schrader. Vent. Ventenat. 
Schreb. Schreber. Wahl. Wahlenberg. 
Schw. “Schweinitz. Wang. Wangenheim. 
Scop. - Scopoli. Walt. Walter. 
Shutilw. Shuttleworth. Wallr. Wallroth. 
Sulliv. Sullivant. Wendl. Wendland. 
Torr. Torrey. Willd. Willdenow. 
IV. SIGNS USED IN THIS WORK. 
@) An annual plant. 
@) A biennial plant. 
Y A perennial plant. 
9 The length in feet; as, “2° long," two feet long. 
' The length in inches; as, “2! long," two inches long. 
" The length in lines; as, “2” long,” two lines long. 
(*) Placed at the end of a specific character, denotes that the species is not well 
known. 
"Two adjeetives connected by a hyphen denote a form intermediate between the 
two; as, “ ovate-lanceolate,” between ovate and lanceolate. - 
Two o giri called pW dash, as “stem "e denote. me the Mag 
of the stem varies from four to six feet. : 
n. Sp. fee that the species, or genus, is naw, or has not ont previodily 
n.gen.) characterized. 
t 
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