ERICACEAE 101 



the petals or lobes of the corolla; ovary 3-10-celled; style 1. A 

 large family divided into a number of well-marked sub-families, but 

 mostly represented only in wooded regions. 



1. P*ROLA. Shin Leaf. 



Calyx 5-parted, persistent; petals 5, with points usually turned 

 inward; stamens 10; capsule 5-valved; seed minute; stigma 

 5-lobe'd. Low, smooth, somewhat woody, evergreen perennials, 

 with clusters of petioled leaves, and a simple flower scape rising from 

 a slender creeping rootstock. 



* Style straight. 

 t Sttlb included. 



1. P. minor, L. 



Leaves rounded, with margined petioles; flowers small, white, crowded on 

 the scape. Cool woods, Rooky Mts. and northward. 



tt Style long and exserthd. 



2. P. seciinda, L. 



Leaves ovate; flowers greenish white, crowded all on one side of the scape. 

 Rich woods, Man.-Alta. 



** Style strongly declined, apex turned up. 



3. P. chlorslntha, Sw. 



Leaves small, rounded, thick; flowers small, greenish white, few on the 

 scape; style not much exserted. Sandy soil in evergreen woods, Man.- 

 Alta. 



4. P. elHptica, Nutt. 



Leaves thin, eUiptioal, longer than the petiole; flowers white in a many- 

 Bowered raceme. Dry woods, Man. and Sask. 



5. P. americtna. Sweet. 



Leaves orbicular or nearly so, thick, shiny; flowers white, in a long, many- 

 flowered raceme. (P. rolundifoUa oi many authors.) Dry woods, swampa, 

 or mountain tops, Man.-Alta., especially northward. 



6. P. asarifSlia, Michx. 



Leaves often longer along the transverse axis, cordate at the base, thick 

 and shiny; flowers pink or rose color. (P. rotundifolia, var. asarifolia, 

 Hook.) Cool dry woods, Man.-Alta. 



