Cornus 



Ericaceae 



733 



50 



Map 1564 



Cornus Amomum Mi 



50 



Map 1565 



Chimaphifa maculata (L.) Pursh 



about swamps, ponds, and lakes and along streams. South of this area it 

 becomes infrequent to rare, especially in the unglaciated region. 

 Que. to Alberta, southw. to Pa. and Mo. 



10. Cornus Amomum Mill. Silky Dogwood. Map 1564. Our only speci- 

 mens are from the bank of the Ohio River in Crawford and Jefferson 

 Counties. 



Newf. to Fla., westw. to Ky. 



233. ERICACEAE DC. Heath Family 



Ovary superior. 



Plants saprophytic, without green color; pollen grains simple; anthers horizontal, 



opening by 2 transverse slits; fruit a capsule 



1. Subfamily Monotropoideae, p. 733. 



Plants with green foliage; pollen grains compound. 



Corolla polypetalous ; anthers inverted, dehiscing by basal (apparently apical) 



pores ; fruit a capsule 2. Subfamily Pyroloideae, p. 733. 



Corolla gamopetalous ; anthers erect, dehiscing by apical pores (except Oxyden- 



drum whose anthers open by chinks) ; fruit a berry or capsule 



3. Subfamily Ericoideae, p. 734. 



Ovary inferior; pollen grains compound; corolla gamopetalous; fruit a berry 



4. Subfamily Vaccinoideae, p. 734. 



1. Subfamily Monotropoideae 



Plants white or somewhat tinged with pink; corolla polypetalous 



6169. Monotropa, p. 737. 



2. Subfamily Pyroloideae 



Leaves scattered, lanceolate or oblanceolate ; flowers in corymbs or umbels; styles very 

 short; valves of capsule with smooth edges 6166. Chimaphila, p. 734. 



Leaves basal, suborbicular or elliptic; styles long; valves of capsules with cobwebby 

 margins 6167. Pyrola, p. 735. 



