"20 COXTRIBUTIOXS FROM THE NATIONAL HERBARIUM, 



Subkingdoni Sperniatophyta. 



Plants with flowers which produce seeds. Flowering plants. 



KEY TO THE CLASSES. 



0\"xiles and seeds borne on the face of a bract or scale: stigmas wanting. 



1. GYMNOSPERMAE. 

 Ovules and seeds borne in a closed cavity ; stignias present. 



2. ANGIOSPERMAE. 



CLASS 1. GYMXOSPERMAE. 



Leaves pinnate, broad ; cotyledons united CYCADACEAE. 



Leaves entire or denticulate, narrow, usually needle-like or scalelike ; coty- 

 ledons distinct. 



Stems jointed. Leaves reduced to whorled scales GNETACEAE. 



Stems not jointed. 

 Ovulate flowers solitary : fruit baccate, small. Leaves short, linear. 



TAXACEAE. 

 Ovulate flowers few or numerous : fruit a dry or fleshy cone, often larse. 



PINACEAE. 

 CLASS 2. ANGIOSPERMAE. 



KEY TO THE SUBCLASSES. 



Cotyledon 1: stems endogenous; leaves parallel-veined. 



1. M0N0CX)TYLEDONEAE. 

 Cotyledons normally 2; stems exogenous; leaves not parallel-veine^l. 



2. DICOTYLEDONEAE 



Subclass 1. Monocotyledones. 



Ovary inferior. Leaves mostly basal, often spine-toothed. 



AMARYLLIDACEAE. 

 Ovary superior. 



Perianth rudimentary, of scales, green or greeni.sh. never corolla-like. 



Grasses POACEAE. 



Perianth of 2 distinct series, the inner series usually corolla-like. 



Ovules solitary in each cell of the ovary. Palms: leaves usually compound 



or deeply lobed PHOENICACEAE. 



Ovules 2 to many in each cell. 



Inflorescence a fleshy spadix surrounded by a spathe ; leaves succulent. 



Plants usually epiphytic and scandent ARACEAE, 



Inflorescence not a spadix. 



Styles present; stems not scandent, unarmed; leaves linear or dagger- 

 shaped LELIACEAE. 



Styles none; stems scandent, armed with spines; leaves broad. 



SMILACACEAE. 

 Subclass 2. Dicotyledones. 



KEY TO THE SERIES. 



Perianth .'segments wanting or all similar (especially in textur*^ and color). 

 rarely .somewhat unequal, .t or fewer 1. APETAXAE. 



