ANALYTIC KEY TO THE FAMILIES 

 OP ,THE 



COMMON PLANTS OF MANITOBA, SAS- 

 KATCHEWAN, AND ALBERTA 



(Carried out to genera where the genus differs in characteristics from 

 the family.) 



DIVISION I. PTERIDOPHYTA 



Fern-like or rust-like plants without true flowers and reproducing by 

 means of spores. 

 A. Rush-like plants with jointed stems, the joints surrounded by con- 

 spicuous toothed sheaths ; the stems terminating in conical spikes. 



Equisetacece, p. 4 

 AA. FernJike plants with leaf-like fronds. 



Fronds from a creeping rootstock Polypodiacew, p. 1 



Fronds from fleshy roots - . Ophioglossacece, p. 2 



DIVISION 11. SPERMATOPHYTA 



Plants with true flowers and reproducing by means of seeds. 



SUBDIVISION I. GYMNOSPERM^ 



Trees or shrubs with needle-shaped leaves and ovules not enclosed in 

 an ovary. 

 A. Flowers in catkin-like spikes which become cones in fruit . Pinacece, p. 4 



SUBDIVISION II. ANGIOSPERM^ 



Plants having the ovules borne in a closed ovary which matures into 

 a fruit. 



Class 1. MONOCOTYLEDONE.ffi; 



stems, when present, without central pith or annual rings ; seeds 

 with only one cotyledon ; leaves usually straight-veined. 



vii 



