Lemnaceae, Eriocaulaceae 23 



Fam. 2. Lemnaceae. Small free-swimming thalloid 

 plants not differentiated into stem and leaves. Flowers 

 monoecious. ^ flower of one stamen. % of one carpel 

 with 1-6 basal ovules. 



Subfamily i. Lefnnoideae. Roots present. InHor- 

 escejtce with spathe and two cT flowers. 



Roots several. Spirodela. 



Root solitary. Lemna. 



Subfamily 2. Wolffoideae. Roots absent. Inflor- 

 escence without spathe and with only one ^ flower. 



Wolffia. 



B. Orders with tyTpically pentacyclic flowers. 

 Whorls typically isomerous, mostly 3-merous. 



(For A see page 10.) 



a. Flozvers homochlamydeoiLS to heterochlamydeons^ 

 very rarely naked. Bracteoid perianths still occur but 

 petaloid perianths predominate. Hypogyny and Actino- 

 morphy preponderate. (For b see page 29.) 



Order 5. Farinosae. Mostly herbs, rarely with 

 well-developed stem. Flowers cyclic, homo- or hetero- 

 chlamydeous, 3 or 2-merous. General floral formula 

 T 3 -I- T 3 (more rarely K 3 -f C 3), A 3 + 3, G (3). 

 One whorl, or all but one of the stamens may be absent. 

 Ovules orthotropous, but anatropous ovules also occur. 

 Rjidosperm mealy. 



Fam. Eriocaulaceae. Perennial, scapigerous herbs. 

 Leaves narrow, chiefly radical. Flozvers in involucrate 

 heads, monoclinous, usually monoecious. Perianth 

 membranous. Outer whorl of stamens mostly absent. 

 Carpels (2-3). Styles 2-3. Ovary 2-3-loc, each loculus 



