KEY TO NATURAL ORDERS 61 
Crass II—DICOTYLEDONS—P tants witH TWIN-LOBED OVULES 
(Page 164) 
The seeds have 2 lobes or cotyledons. The leaves are, almost al- 
ways, net-veined, and the distinction of pith, wood and bark is evident. 
The flower parts or members are very rarely in 3’s, but usually in 5’s 
or less frequently in 4’s. 
SUB-CLASSES, GROUPS AND ORDERS OF DICOTYLEDONOUS 
PLANTS IN OUR AREA 
SUB-CLASS I—CHORIPETALAE 
(Page 166) 
Petals separate (examples: Buttercup, Pink, Violet). This natural 
Sub-Class is here divided into two more or less natural groups, for 
notwithstanding the sub-class is composed of plants, the flowers of 
which are assumed technically to have divided petals there is, in fact, 
a great group in which the petals are undeveloped or in which the 
floral envelope is of a very rudimentary character. We shall then 
assume the groups: 
1. Flowers without petals .. . . . Ist. Group, APETALAE 
2. Flowers with several petals or colored sepals. 2d. Group, 
5 POLYPETALAE 
GROUP I.—ORDERS OF APETALOUS CHORIPETALAE 
OrDER I—JULIFLORALES—CaAtTKIN-BEARING TREES AND HERBS 
Page 166) 
Flowers grouped in large numbers in catkin-like inflorescence or 
in fascicles. Flowers without corolla and often without calyx. Trees, 
shrubs and herbs, 
40. 41. 42. 43. 44. ae 46. 47. 48, 49. 50. 
40. Staminate catkin of Willow. . Single flower. 42. Pistillate catkin of Wil- 
low. 43. Staminate catkin of Boular y baa Pistillate catkin of Poplar. 45. Pistillate 
eatkin of Hornbeam. 46. Single pistillate flower. 47. Staminate cluster of Elm. 
48. Winged seed of Elm. 49. Catkin of Nettle. 50. Catkin of Hop. 
OrpdER II—SANTALES—TuHE MISTLETOE ORDER 
(Page 196) 
Plants, (ours) all parasites; calyx present, sometimes colored, co- 
rolla absent, flowers not in catkins, Ovary 1-celled, below the sepals. 
PA Me pe 
51. Mistletoe. 52. Flower ae Wild Giinger. 53. Sages of Dutchman’s Pipe. 
