KEY TO FAMILIES 



1 i try _' celled or 4-lobed 

 m. Ovary 2-celled 



1 111 ) Leafless colorless herbs 

 (n) Leafy herbs 

 r. Petals very hairy on the upper face 

 S. Petals smooth 



(r) Stamens 5; Sowers regular 

 (s) Stamens 2-4 ; (lowers irregular 

 n. Ovary 4 lobed or divided 



i in) Flowers irregular, stem usually square 

 (n) Flowers regular 

 (z) Ovary 3-celled 

 (b) Ovary inferior 

 \. Woody plants 

 ' Stamens 5 

 (y) Stamens 8-10 

 y. Herbs 



(x) Stamen-; 3 

 (y) Stamens 4-5 

 m. Stamens united, sap milky 

 n. Stamens separate 

 (m) Leaves united by their ba 

 (n) Leaves not united 

 (?) Stamen- 8-12 

 2. Flowers in heads 



a. Ovary superior 



b. Ovary inferior 



(1) PetaK separate, style simple 

 _ Petals united, style 2-eleft 

 (a") Flowers all ligulate, sap milky 



1 Some or all of the flowers tubular, sap not milky 

 II. Petals absent 

 1. Sepals present, rarely very minute 



a. Woody plants 



(1) High climbing vines, petals present but falling quickly 



(2) Shrubs or trees 



(a) Flowers in catkins, at least the staminate 

 v Pistillate flowers in catkins, sap milky 



y. Pistillate flowers solitary, sap not milky 



(b) No catkins present 



\. Style 1. stigma 1, or slightly 2-cleft 

 (x) Trees with compound leaves 

 (y) Low shrubs with simple leaves 

 m. Leaves green, glabrous 

 n. Leaves silvery or scurfy 

 Styles or long sessile stigmas 2 

 (x) Leaves deeply cut or compound 

 iv i Leaves simple, not deeply cut 

 z. Pistils 2-5. thorny shrub 



b. Herbs 



(1) Nearly colorless herbs, parasitic on trees 



(2) Plants with green leaves 



(a) Pistils several-many 



(b) Pistil 1, at least the ovary 



x. Sepals united into a corolla-like tube 



■nchaceae 



23 



Menyonthoceot 



20 



Solanaceae 



Scrophulariac 



21 

 22 



Lamia* 



iginaceae 



Polemonia 



24 

 21 

 20 



Caprifolia< 



Erica i 



36 

 18 



I'alcrianaceae 



38 



Campanula 



38 



Caprifoliaceae 



Rubiaceae 



Adoxaceae 



36 



36 

 37 



Tri folium in Faba 



28 



Contaceae 



35 



Cichoriaceae 

 Asterot 



39 

 38 



Vitaceae 



31 



Moraceae 



16 



Fagaccae 



34 



Oleaceae 



20 



Thymeleaceae 



31 



Elaeagnaceae 



31 



Aceraceae 



32 



Ulmaceae 



16 



Rutac 



17 



Loranthaceae 



31 



Ranunculaceae 



7 



Allioniace 



15 



