Xli ANALYTICAL KEY TO FAMILIES OF ANGIOSPERMS. 



PAGB 



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



Vallisneriaceae (Hydrocharidaceae) 59 

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



i Ovules many in each cavity Onagraceae 65 1 



it Ovule 1 in each cavity Haloragidaceae 664 



gg Not floating aquatics. 



// Ovary 4 -relied Onagraceae 651 



hh Ovary 1 -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. 



Cichoriaceae (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 dioe- 

 cious Ambrosiaceae (in Compositae) 908 



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



or dioecious 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 1 ; 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, 1 -celled with several parietal placentae. 

 * Plants covered with tuberculate or spinulose-roughened, often 



hooked hairs Loasaceae 641 



it Plants very fleshy, often aphyllous or spiny Cactaceae 643 



gg Stamens 12 or fewer. 



h Vines, usually with tendrils Cucurbit aceae 881 



hh Not vines. 

 i Ovule 1 in each cell; aquatic plants or in muddy places. 



Haloragidaceae 664 

 ii Ovules many in each cell, or if 1, then plants neither aquatic nor in 

 mud. 



j Style 1 ; stamens mostly 4-8 Onagraceae 65 1 



jj Styles 2 or 3; stamens mostly 5-10 Saxifragaceae 476 



ee Corolla gamopetalous. 



/ Vines usually with tendrils Cucurbit aceae 881 



ff Not vines. 

 g Ovary 1 -celled with central placenta; stamens opposite lobes of corolla. 



PRIMUL ACEAE 713 



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



Campanuiaceae 883 



eee Corolla wanting or not markedly differing from the calyx. 

 f Flowers irregular. 



g Fertile stamens 1-2; monocotylcdonous ORcmnACKAE 2S9 



gg Fertile stamens 6-many, dicotyledonous Aristolochiaceae 347 



ff Flowers regular. 

 g Leaves linear, parallel- veined; monocotyledonous. 

 h Aquatic plants; stamens 3-12; ovary t -celled (6-9<elled). 



Yai.i.isnekiace ae (Hydrocharidaceae) 59 





