KEY, 141 



Leaves not lobed, nor parted, but entire, or serrate. 

 Stamens not monadelphous, and rarely unequal 169 



169. Plants (conspicuously) caulescent ITO 



Plants acaulescent, or nearly so 174 



1 70, Anther-cells opening by chinks or pores at the apex ; 

 anthers often 2-horned 172 



Anther-cells opening lengthwise, not appendiculate. 

 Pod 2- to 3-, or 3- to 5-celled 171 



171. Leaves alternate, or crowded. A low, branched 

 everfyreen, 6-10 inches high. Leaves smooth, shining, oval 

 or oblong. Flowers sm%ll, white, in terminal, umbel-like clus- 

 ters. Pods 2- to 3-celled. Iieiophylliiin buxifolium, Ell. 



Leaves opposite or whorled, lanceolate, nearly ses- 

 sile. Calyx broadly bell-shaped, 5- to 7-toothed, with horn- 

 like processes in the sinuses. Stems recurved, 2-8 feet 

 long, 4- to 6-sided. Stamens 10, half of them shorter. Flow- 

 ers rose-purple, axillary. Pods 3- to 5-celled. 



Nesaea verticillata, H. B. K. 



172, Leaves strongly replicate at the margin, elliptical 

 or oblong, entire, with a rusty down underneath 153 



Leaves not replicate 173 



173. Shrubs or trees. Anthers inversely arrow-shaped. 

 Style slender, 3-cleft at the apex. Pod 3-celled, many-seeded. 

 Leaves serrate, either wedge-obovate, or oval, or oblong, de- 

 ciduous. Flowers in hoary, terminal racemes, white, often 

 fragrant. Clethra. 



Almost herbaceous plants. Anther-cells produced, 

 upward into tubes, opening by a 2-lipped pore ; filaments di- 

 lated and hairy in the middle. The anthers sometimes violet. 

 The short, ascending stems 3-10 inches high. Leaves wedge- 

 lanceolate or lanceolate, serrate or toothed, whorled or scat- 

 tered. Peduncles 1- to 7 -flowered. Chimaphila. 



1 74, Flowers in a raceme. Petals not spreading. An- 

 thers slightly 2-horned, if at all. Style generally turned to 

 one side, the 5 stigmas more or less conspicuous, mostly tu- 

 bercular. Valves of the pod cobwebby on the edges. 



Pyrola. 



