74 Halorrhagaceae, Araliaceae 



Fam. 5. Halorrhagaceae. Herbs of very diverse 

 habit. Flowers small, heterochlamydeous, or often apo- 

 petalous. Stamens twice as many as sepals or fewer. 

 Anthers long, 4-angled. Carpels usually (4) united to 

 the tubular axis, each with one pendulous ovule. Styles 

 separate. Fruit a nut or drupe. Seeds with endosperm. 



Subfamily i. Halorrhagoideae. Petals 2-4 or o. 

 Carpels (2-4) each with one ovule. 



Only British genus (leaves whorled, deeply pin- 

 natifid. Petals 2-4) : Myriophyllum. 



Suborder 3. HiPPURIDINEAE. Flowers epigynous. 

 Stamen i. One carpel with one ovule without integu- 

 ment. 



Fam. 6. HiPPURlDACEAE. Aquatic herbs. Leaves 

 linear, in whorls. Flowers minute, axillary, naked. 

 Carpel I with one undivided style, stigmatic throughout 

 its length. 



Only genus (stems simple, erect) : Hippuris. 



Order 20. Umbellales (Umbelliflorae). Flowers 

 mostly in umbels, cyclic, heterochlamydeous, usually 

 haplostemonous, epigynous, 4-5-merous. Carpels (5-1), 

 each carpel with one (rarely two) pendulous anatropous 

 ovules with one integument. Seeds with copious endo- 

 sperm. 



Fam. I, Araliaceae. Mostly trees and shrubs, 

 often twining or climbing by aid of roots. Leaves alter- 

 nate, simple or compound, often stipulate. Flowers 

 mostly in umbels or heads, 5-merous. Calyx often with 

 obscure limb. Stame7is usually 5. Carpels (i-oo) each 



