Xll ANALYTICAL KEY TO FAMILIES OF ANGIOSPERMS. 



h Perianth-parts 6; leaves whorled, elliptic-linear, sessile. 



VALLISNERIACEAE (HYDROCHARIDACEAE) 59 

 hh Perianth-parts 4; rarely with 2-4 more petals. 



* Ovules many in each cavity ONAGRACEAE 651 



ii Ovule i in each cavity HALORAGIDACEAE 664 



gg Not floating aquatics. 



h Ovary 4-celled ONAGRACEAE 651 



hh Ovary i -celled SAXIFRAGACEAE 476 



cc LEAVES ALTERNATE OR BASAL. 



d Flowers in simple, compound or paniculate umbels; leaves mostly com- 

 pound, rarely simple. 



e Fruit dry, splitting into 2 parts; ovary 2-celled; styles 2 . UMBELLIFERAE 669 

 ee Fruit fleshy; ovary 3-5 -celled (rarely 2-celled); styles 2-5.ARALIACEAE 667 

 dd Flowers in involucrate heads. 

 e Flowers all with ligulate corollas; juice milky. 



ClCHORIACEAE (in COMPOSITAE) 889 



ee Flowers all tubular or the outer ligulate; juice very rarely milky. 



f Stamens distinct or nearly so; flowers greenish, monoecious or dice- 



cious AMBROSIACEAE (in COMPOSITAE) 908 



ff Stamens syngenesious ; flowers green or showy, perfect, monoecious 



or dicecious COMPOSITAE 913 



ddd Flowers not in involucrate heads nor in umbels (or rarely in simple 



umbels, then also the leaves simple). 

 e Corolla of separate petals. 



f Flowers with 5 or more conspicuous staminodia. 

 g Staminodia petal -like; fertile stamen i; monocotyledons. 



MARANTACEAE 288 

 gg Staminodia stamen-like; fertile stamens 5 ; dicotyledons. 



PARNASSIACEAE (in SAXIFRAGACEAE) 475 

 ff Flowers without staminodia. 

 g Stamens more than 12. 



h Ovaries several, simple; ordinary herbs ROSACEAE 490 



hh Ovaries compound, i -celled with several parietal placentae. 



* Plants covered with tuberculate or spinulose-roughened, often 



hooked hairs LOASACEAE 641 



ii Plants very fleshy, often aphyllous or spiny CACTACEAE 643 



gg Stamens 12 or fewer. 



h Vines, usually with tendrils CUCURBIT ACEAE 88 1 



hh Not vines. 



* Ovule i in each cell; aquatic plants or in muddy places. 



HALORAGIDACEAE 664 



ii Ovules many in each cell, or if i, then plants neither aquatic nor in 

 mud. 



j Style i ; stamens mostly 4-8 ONAGRACEAE 651 



jj Styles 2 or 3; stamens mostly 510 SAXIFRAGACEAE 476 



ee Corolla gamopetalous. 



/ Vines usually with tendrils CUCURBITACEAE 881 



ff Not vines. 

 g Ovary i-celled with central placenta; stamens opposite lobes of corolla. 



PRIMULACEAE 713 

 gg Ovary 2-5 -celled; stamens alternate with lobes of corolla. 



CAMPANULACEAE 883 



eee Corolla wanting or not markedly differing from the calyx. 

 f Flowers irregular. 



g Fertile stamens 1-2; monocotyledonous ORCHID ACEAE 289 



gg Fertile stamens 6-many, dicotyledonous ARISTOLOCHIACEAE 347 



ff Flowers regular. 



g Leaves linear, parallel-veined; monocotyledonous. 

 h Aquatic plants; stamens 3-12; ovary i -celled (6-9-celled). 



VALLISNERIACEAE (HYDROCHARIDACEAE) 59 



