2 KEY TO THE SPECIES 



A. ARCHICHLAMYDEiE 



Corolla either wanting (apetalous) or of separate petals (polypetalous). 

 1. Corolla wanting, and sometimes the calyx also (naked) 



a. Flowers in aments (dense scaly spikes) ; frees, shrubs or vines 

 Calyx wanting. 



A single flower in the axil of each bract ; fruit a pod with numerous 



downy-tufted seeds Salicacese 14 



Pistillate flowers 3 or 3 in the axil of each bract ; fruit a winged or wingless 



nut Betulacese 15 



Calyx present. 



Fruit a nut inclosed by a cup or involucre Fagacese 16 



Fruit an achene ; twining vines . . Moraceae 17 



b. Flowers not in amenta 

 * Shrubs or trees 



Leaves opposite, palmately lobed ; fruit in pairs and winged . Aceraceae 47 



Leaves alternate, simple. 



Fruit winged all around .... . . TJlmaceae 17 



Fruit berry-like . . ... . lElea.gna.cesei 52 



* * Herbs ; sepals sometimes petal-like 



Pistils more than one, separate or nearly so . . . Banunculaceae 23 



Pistil one ; ovary superior. 



Ovary 5-celled and 5-beaked Crassulacese 33 



Ovary 3-celled, becoming a 3-lobed capsule . . . Euphorbiaceae 4Q 

 Ovary 2-celled, becoming an emarginate capsule , Scrophulariacese 73 

 Ovary 1-celled, becoming an achene Polygonaceae 18 



Pistil one ; ovary inferior. 



Leaves alternate ; fruit dry, nut-like .... Santalacese 17 



Leaves opposite ; fruit inclosed by the calyx . . , Nyctaginaceie 20 



2. Calyx and corolla both present^ the latter of separate petals 

 (polypetalous) 

 it. Stamens more than 10 

 Trees, shrubs, or woody vines ; leaves alternate. 



Pistils numerous, leaves with stipules Bosaceee 35 



Pistil one ; fruit fleshy. 



Ovary l-celled ; fruit a drupe (stone fruit) .... Drupaceae 40 

 ■ Ovary 5-celled ; fruit a pome (calyx fleshy) .... Pomaceee 39 

 Herbs. 



Pistils several. 



Stamens on receptacle Banunculacese 23 



Stamens on the calyx Rosaceae 35 



Pistil one. 



Stamens separate. 



Sepals 2 . Papaveraceae 27 



Sepals 4 Capparidaceae 31 



Sepals numerous Cactaceae 51 



Calyx 5-Iobed . . . . ... lioasacese 50 



Stamens united into a column . . ... Malvaceae 48 



