FLOKA OF THE DISTRICT OF COLUMBIA. 221 



1. CHIMAPHILA Pursh. 



Leaves variegated with white or light green along the veins, broadest near the base. 



1. C. maculata. 

 Leaves not variegated, broadest above the middle 2. C. umbellata. 



1. CMmapkila maculata (L.) Pursh. Spotted pipsissewa. 

 Dry sterile woods; frequent on the Coastal Plain. June-July. Eastern U. S. 



2. Chimaphila umbellata (L.) Nutt. Pipsissewa. 

 Dry sterile woods; frequent on the Coastal Plain. July. Eastern N. Amer.; Eur. 

 The American form has been distiuguished as C. umbellata cisatlantica Blake. 



2. PYEOLA L. Shinleaf. 



Style straight; flowers all turned to one side, 1. P. secunda. 



Style strongly bent downward at base and then curved upward; flowers distributed 

 around the main axis. 

 Leaves nearly circular, mostly not over 3 cm. long, shorter than the slender petiole; 



calyx lobes ovate, about 2 mm. long 2. P. chlorantha. 



Leaves mostly 4-6 cm. long; calyx lobes ovate or oblong. 



Leaves orbicular, thick; calyx lobes oblong, 3 mm. long 3. P. americana. 



Leaves elliptic, thin; calyx lobes triangular-acute, scarcely 2 mm. long. 



4. P. elliptica. 



1. Pyrola secunda L. 



Rich woods; above the fall line; infrequent. June. Northern N. Amer., south 



to Va. 



2. Pyrola chlorantha Swartz. 



Dry pine woods; infrequent. June. Northern N. Amer., south to Va. 



3. Pyrola americana Sweet. 



Moist or sandy woods; frequent. June. Eastern N. Amer. (P. rotundifolia of 

 Ward's Flora.) 



4. Pyrola elliptica Nutt. 



Dry woods; infrequent; the only specimens seen collected by Ward on the Carroll 

 Estate (Rock Creek Park). June. Northern states, south to Va. 



119. MONOTROPACEAE. Indian pipe Family. 



Petals united 1. MONOTEOPSIS. 



Petals separate. 

 Plants 1-flowered, glabrous, usually waxy white (black in drying). 



2. MONOTROPA. 

 Plants several-flowered, pubescent, tawny or pinkish 3. HYPOPITYS. 



1. MONOTROPSIS Schwein. 



1. Monotropsis odorata Ell. Sweet pinesap. 



Rich woods; rare; Conway station, near Woodwardville, just beyond our limits 

 (TFaxfe, April 21, 1912). Md. to N. C. 



The flowers are fragrant. 



2. MONOTROPA L. 



1. Monotropa uniflora L. Indian pipe. 



Rich woods; frequent. June-Sept. Widely distributed in N. Amer.; also in Asia. 

 The flowers are drooping, but the fruit is erect. The plants are rarely pink. 



