xviii ANALYTICAL KEY TO FAMILIES OF ANGIOSPERMS. 



PAGE 



o No sterile stamens CISTACEAE 630 



oo Sterile stamens present. PARNASSIACEAE (in SAXIFRAGACEAE) 475 



nn Flowers irregular VIOLACEAE 633 



// Placenta i, parietal; stamens alternate with or opposite to the 



petals. 

 > -..' m Anthers opening by uplifting valves, or leaves peltate; stamens 



opposite to the petals BERBERIDACEAE 432 



mm Anthers not opening by uplifting valves; leaves not peltate; 

 stamens alternate with the petals. 



n Fruit an achene or follicle RANUNCULACEAE 411 



nn Fruit a legume. 



o Flowers medium, regular or irregular; stamens mostly in- 

 cluded. 

 p Upper petal inclosed by the lateral ones in the bud. 



CAESALPINACEAE (in LEGUMINOSAE) 528 

 PP Upper petal inclosing the lateral ones in the bud. 



PAPILIONACEAE (in LEGUMINOSAE) 532 

 oo Flowers small, regular; stamens exserted. 



MIMOSACEAE (in LEGUMINOSAE) 527 

 /// Placenta i, free-central; stamens opposite the petals. 



PRIMULACEAE 713 

 hh Ovary 2 many-celled. 



* Stamens 5-many; mostly aquatic plants with peltate or deeply cor- 

 date leaves NYMPHAEACEAE 406 



ii Stamens many; terrestrial; leaves not as above. 



j Style dilated, umbrella-like; leaves tubular SARRACENIACEAE 470 



jj Style ordinary; leaves not tubular. 

 k Styles 2-7. 



/ Foliage punctate HYPERICACEAE 624 



// Foliage not punctate RANUNCULACEAE 411 



kk Style i or o CISTACEAE 630 



Hi Stamens 2-15; plants not as in **. 

 j Anthers opening by terminal pores, inverted. 



jj Anthers opening longitudinally PYROLACEAE (in ERICACEAE) 692 



k Stamens tetradynamous CRUCIFERAE 443 



kk Stamens not tetradynamous. 

 / Styles 2-5, or stigmas 5. 



m Aquatics or mud-creepers; ovules many ELATINACEAE 629 



mm Terrestrial, or if in mud, erect. 

 n Ovules numerous in each cell. 



o Leaves alternate PENTHORACEAE (in CRASSULACEAE) 475 



oo Leaves whorled CONVALLARIACEAE (in LILIACEAE) 269 



nn Ovules 1-2 in each cell. 



o Ovary i-3-celled EUPHORBIACEAE 585 



oo Ovary 4 5 -celled or falsely 8 lo-celled. 



p Ovary 4-5 -celled, deeply 4~5-lobed GERANIACEAE 573 



pp Ovary falsely 8-io-celled, not deeply lobed LINACEAE 578 



tt Style i; stigmas 1-3. 



m Leaves sheathing or clasping; parts in 3*5, rarely 2*s, monocoty- 

 ledons. 

 n Petals deliquescent, blue or white; fertile stamens 3-6. 



COMMELINACEAE 239 



nn Petals not deliquescent; fertile stamens 6, rarely 4. 



CONVALLARIACEAE (in LILIACEAE) 269 

 mm Leaves not sheathing nor clasping; parts in 2*s or 5's. 

 n Leaves simple. 



o Stamens 2; petals 4 CRUCIFERAE 443 



oo Stamens many; petals 3 or 5 CISTACEAE 630 



nn Leaves compound or pinnately divided. 

 o Aquatics TRAPACEAE 664 



