APETALAE 165 
ORDERS OF THE GROUP APETALAE 
1. Flowers in catkins or in various groups resembling catkins. 
Flowers without corolla and usually without calyx 
- Orver I. JULIFLORES 
Herb with nodding spike resembling a catkin 
SuB-OrpER Piperales 
Flowers in true aments or catkins, calyx none 
Sus-Orper Amentaceae 
Flowers in catkins, a calyx usually present 
Sus-OrpEer Fagales 
Flowers in groups of various forms, each flower bear- 
ing stamens alone or pistils alone, leaves with- 
out stipules . . . . . Sus-Orper Urticales 
2. Flowers not in catkins, calyx present, plants all para- 
eiesee 1 4. Se ee te ORDER EI SSANTALALES 
3. Flowers not in catkins, calyx present, ovules arranged 
around a central column of the single celled ovary. 
Sah a small part of this Order is apetalous.) 
OrpdErR III. CENTROSPERMAE 
(For the continuation of the Synopsis of the Orders of Chori- 
petalae see the beginning of the Group Polypetalae.) 
While the apetalous Orders and Sub-Orders are usually re- 
garded as an artificial group, it is doubtless true that they differ 
materially from the typical Choripetalae and that the herbs and 
trees belonging to this group are more primitive in respect to the 
flower than those belonging to groups with more specialized 
flowers. The flowers of this group are not’ only of very simple 
structure but in most cases the stamens are borne on one tree or 
plant while the pistils are borne on another. 
