[VOL.* 2 



142 ANNALS OF THE MISSOURI BOTANICAL GARDEN 



Family 155. Clethraceae. White alders. Shrubs and trees 



of warm climates, with alternate deciduous leaves and pen- 

 tamerous flowers; stamens 10; pistil tricarpellary ; endosperm 

 fleshy. Clethra. (Pf. 4 1 :!.) 



Family 156. Ericaceae. Heaths. Shrubs and small trees 

 with mostly evergreen alternate or opposite leaves; ovary 

 typically superior (sometimes inferior), 2-10-celled; anthers 

 usually dehiscing by an apical pore ; endosperm fleshy. Rho- 

 dodendron, Kalmia, Gaultheria, Arctostaphylos, Gaylussacia, 

 Vaccinium, Calluna, Erica. (Pf. 4 1 : 15.) 



Family 157. Epacridaceae. Shrubs and small trees (mostly 

 Australian) with mostly alternate evergreen leaves; ovary 

 superior, mostly 2-10-celled; fruit capsular or drupaceous; 

 anthers dehiscing by a slit ; endosperm fleshy. Epacris. ( Pf . 

 4 1 :66.) 



Family 158. Diapensiaceae. Low undershrubs, with alter- 

 nate evergreen leaves; ovary superior, 3-celled; fruit a cap- 

 sule; anthers dehiscing by a slit; endosperm fleshy. Diapen- 

 sia, Shortia. (Pf. 4! : 80.) 



Family 159. Pirolaceae. Wintergreens. Low evergreen, 

 or chlorophylless herbs, with pentamerous or tetramerous 

 (rarely hexamerous) flowers; stamens twice as many as the 

 petals; ovary 4-6-celled; endosperm fleshy. Pirola, Chima- 

 phila, Monotropa. (Pf. 4 1 :3.) 



Family 160. Lennoaceae. Parasitic, leafless herbs; ovary 



superior, 10-14-carpellary, 20-28-celled ; ovules solitary ; anth- 

 ers dehiscing by a slit; endosperm copious. Lennoa. (Pf. 



4*: 12.) 



Order Primulales. Flowers regular, mostly perfect and 

 pentamerous; stamens epipetalous, mostly opposite to the 

 corolla-lobes; ovary pluricarpellary, mostly 1-celled, with a 

 free-central placenta. (Species about 1581.) 



Family 161. Primulaceae. Primroses. Herbs with alter- 

 nate or opposite leaves ; stamens attached to the upper portion 

 of the corolla tube; pistil 2-6-carpellary, one-celled; ovules 

 many; fruit a capsule dehiscing longitudinally from the apex, 



