XIV ANALYTICAL KEY TO FAMILIES OF ANGIOSPERMS. 

 A A. Ovary superior. 



PAGE 



b COROLLA ABSENT. OR NOT MARKEDLY DIFFERING FROM 



THE CALYX. 

 c Scarcely any Differentiation into Stem and Leaves; floating 



Aquatics Lemnaceae 232 



cc Ordinary leafy Plants. 



d Grass-like plants with very small green or brown flowers; perianth 

 when present rigid; bracts rigid. 



e Perianth present, 6-parted Juncaceae 244 



ee Perianth absent or of bristles or irregular scales. 

 / Leaves mostly in £ phyllotaxy, and mostly with open sheaths; culms 



usually hollow Gramineae 61 



ff Leaves mostly in \ phyllotaxy; sheaths closed; culms solid. 



Cyperaceae 158 

 dd Not grass-like, or if so, with petaloid soft perianth. 

 e Aquatic; rooted or floating, only the flowers sometimes raised above 



the surface. 

 f Submersed leaves entire or denticulate. 



g Flowers yellow Pontederiaceae 242 



gg Flowers not pure yellow. 

 h Flowers in several racemose dense monoecious heads. 



Sparganiaceae 39 

 hh Flowers not in heads or if so, then perfect. 

 i Flowers axillary, solitary, with a 2-lobed, truncate or retuse ovary. 



Callitrichaceae (in Halorageae) 596 

 ii Flowers spicate, or if axillary, then ovary not as above. 



Naiadaceae 40 

 ff Submersed leaves pinnate or dissected. 

 g Plant attached to stones in running water, 2-25 cm. long. 



Podostemaceae 472 



gg Stems long, in quiet water; leaves rigid Ceratophyllaceae 408 



ee Not true aquatics; part of the stem, or leaves, raised above the surface. 

 / Herbs. 

 g Perianth none. 

 h Flowers in dense spikes. 



i Spikes (spadix) provided with spathes, short \kace\f. 229 



ii Spikes long-cylindric, nodding, naked. .Saurur ace \f. (Ptperaceae) 307 

 hh Flowers not in spikes but in special, often calyx -like, involucres. 



EtTPHORBIACBA] 

 gg Perianth -parts several. 



h Perianth -parts bristle-form; flowers in dense spikes TYPHACEAE 38 



hh Perianth -parts not bristle-form. 

 i Three parts of the perianth united into a crested organ. POLYG \ 

 ii Parts of the perianth not united into a crested organ. 

 J Perianth-parts 6-20. 

 k Plants with tendrils; Sowers in umbels.. Smilaccae (in Liliaceae) 275 

 kk Plants without tendrils. 



/ Gray epiphytes, lichen-like, on trees Bromeliaceae 238 



U Not epiphytes. 

 tn Ovary x-celled: ovule 1. 

 n Succulent monocotyledons; flowers on a spadix with a spathe. 



Araceae 229 

 fin Not succulent, dicotyledons; flowers not as above; leaves 



with stipular sheaths Polygonaceae 350 



mm Ovaries 3— many, separate. 



n Stamens 3-6. Scheucfizeriaceae (in Naiadaceae) 52 



nn Stamens many Ranunculaceae 411 



tnmm Ovary single, 2-4-many-celled. 

 n Rigid-stemmed dicotyledons; leaves netted; ovules 1-2 in 



each cavity Euphorbiaceae 585 



