Lemnaceae, 53. 



vi KEY TO THE FAMILIES. 



I lass ANGIOSPERMAE. 

 Sub-class MONOCOTYLEDONES. 

 Plants small, floating, with no distinction of stem and 



le.l\ 



Plants with normal foliage. Araceae 52 



Inflorence a Beshy Bjpadix. araceae, m. 



Inflorescence not a fleshy spadix. 



Perianth none, <>r of bristles, chaffy scales 

 . .r a hyaline envelope. 

 Rowers not in the axils of chaffy bracts. 

 Pi rianth herbaceous or none. 



Flowers solitary, axillary. NAJADACEAE, 16. 



Flowers in axillary or terminal 

 clusters. 

 Carpels 3 or 6, united into a 



compound ovary-. Scheuchzeriaceae, 16. 



Carpels2-5 (usually 4), separate. Potamogetonaceae, 14. 

 Perianth of bristles or chaffy scales. 

 Flowers in terminal cylindrical 



spikes. Typhaceae, 13. 



Flowers in axillary globular heads. Sparganiaceae, 13. 

 Rowers in the axils of chaffy bracts. 

 Stems mostly hollow, jointed; leaves 



2-ranked. Poaceae, 18. 



Stems solid; leaves 3-ranked. Cyperaceae, 42. 



Perianth present, the parts glume- or petal- 

 like. 

 Perianth of glume-like segments. Juncaceae, 54. 



1\ ri.uith at least in part petal-like. 



Carpels distinct. Alismaceae, 17. 



( larpels united. 

 ( U.iry superior. 



Flowers more or less irregular, 



surrounded by a spathe. Pontederiaceae, 53. 



Flowers regular, without a 



spathe. LlLIACEAE, 58. 



Ovary inferior. 



Flowers regular. Iridaceae, 66. 



Flowers irregular. Orchidaceae, 67. 



Sub-class DICOTYLEDONES. 

 I. Petals Distinct to the Base or Wanting. 



. 1 . Petals None. 



I'l.mt parasitic on other plants and without chloro- 

 phyll Loranthaceae, 79. 

 ; r.i -it ii- and chlorophyll-bearing. 

 throbs. 



pposite. Aceraceae, 159. 



I • ives alternate. 



Pistillate (lowers not in aments. 



r v l<elled. Ulmaceae, 78. 



Ued. Rhamnus, 161. 



illatc flowers in aments. 



