KEY TO THE FAMILIES 



SUBKINGDOM SPERMATOPHYTA. 



Ovules and seeds borne on the face of a scale. 

 Ovules and seeds contained in a closed cavity (ovary). 



Class 1. 

 Class 2. 



Gymnospermae. 

 Angiospermae. 



Class I. GYMNOSPERMAE. 



Represented with us by 1 family. 



PiNACEAE, 



Class II. ANGIOSPERMAE. 



Cotyledons 1 ; stem endogenous. 

 Cotyledons 2; stem exogenous. 



Subclass 1. 

 Subclass 2. 



MONOCOTYLEDONES. 

 DiCOTYLEDONES. 



Subclass i. MONOCOTYLEDONES. 



Leaves usually parallel-veined; flowers mostly 3-merous or 6- 

 merous. 



Perianth none or when present not petaloid. 



Perianth of minute scales or bristles or wanting. 



Flowers aggregated or scattered, not in the axils 

 of chaffy bracts. 

 Marsh or subaquatic plants. 



Flowers unisexual, in separate heads or 

 spikes, the staminate uppermost. 

 Flowers in spikes; perianth of capillary 



bristles. 

 Flowers in heads; perianth of small 

 scales. 

 Flowers perfect or polygamous. 

 Immersed or floating aquatic plants. 



Immersed or with some of the leaves 

 floating. 

 Fresh water plants; flowers not on a 

 spadix; pollen spherical. 

 Flowers spicate or in axillary clusters. 

 Flowers solitary in the ajdls, uni- 

 sexual. 

 Marine plants; flowers on a spadix; 

 pollen filamentous. 

 Minute floating plants. 

 Flowers in tne axils of chaffy bracts (glumes). 

 Glumes 2 to each flower. 

 Glumes 1 to each flower. 

 Perianth of 6 chaffy scales. 

 Perianth petaloid. 



Pistils several distinct, forming achenes. 

 Pistils united into a compound ovary. 

 Ovary superior. 

 Ovary inferior. 



Stamens 3 ; perianth regular. 

 Stamens 1 or 2 ; perianth irregular. 



Typhaceae, 8. 



Sparganiaceae, 9- 

 Scheuzeriaceae, 14. 



ZaNNICHELLIACEAE, 10. 

 NaIADACEAE, 12. 

 ZosTERACEAE, II. 



Lemnaceae, 70. 



POACEAE, 18. 



Cyperaceae, s8. 

 juncaceae, 72. 



Alismaceae, 16. 



LiLIACEAE, 76. 



Iridaceae, 84. 

 Orchidaceae, 85. 



