XIV ANAL YTICAL KEY TO FAMILIES OF ANGIOSPERMS. 



AA> Ovary superior. 



PAGB 

 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. 

 f 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. 

 / 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 



Mi 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 spafties, short ARACEAE 229 



ii Spikes long-cylindric, nodding, naked. .SAURURACEAE (PIPERACEAE) 307 

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



EUPHORBIACEAE 585 



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. POLYGALACEAE 582 

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

 j Perianth-parts 6-20. 



k Plants with tendrils; flowers in umbels. .Smilaceae (in LTLIACEAE) 275 

 kk Plants without tendrils. 



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



U Not epiphytes. 

 tn Ovary i -celled: ovule i. 

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



ARACEAE 229 

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



with stipular sheaths POLYGONACEAE 350 



mm Ovaries 3~many, separate. 



n Stamens 3-6 SCHEUCHZERIACEAE (in NAIADACEAE) 52 



nn Stamens many RANUNCULACEAE 411 



mmm Ovary single, 2-4-01 any-celled. 



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

 each cavity EUPHORBIACEAE 583 



