io6 



3a. Flower-stalk with a single bract near the middle 



Bladderwort, Utricularia resupinata. 

 3b. Flower-stalk without bracts, except at the base of the pedicels 



Bladdervvort, Utricularia purpurea* 



4a. Stem and numerous dissected leaves floating in water 



Bladderwort,, Utricularia yulgaris var. americana. 



4b. Stem and minute leaves creeping on the bottom of ponds or 

 in mud, while the flowers are borne on erect stalks, easily 

 detached from the delicate stems 5. 



5a. Upper lip of corolla conspicuous, as long or nearly as long as the 



lower lip; lower lip with a prominent raised palate 6. 

 5b. Upper lip of corolla half as long as the lower lip, or less 7. 



6a. Spur of corolla very short and blunt 



Bladderwort, Utricularia glbba, 

 6b. Spur of corolla very long and slender 



Bladderwort, Utricularia cornuta. 



7a. Spur of corolla very short and blunt, or almost none 



Bladderwort, Utricularia minor. 

 7b. Spur of corolla long and slender 



Bladderwort, Utricularia intermedia. 



OROBANCHACEAE, the Broom-rape Family 



Parasitic plants without green color and with scales in place of 

 leaves; corolla 2-lipped, of united petals; stamens 4, attached to 

 the corolla. 



la. Flowers in a widely branching panicle, numerous; growing under 

 beech trees (1 5 dm. high; flowers white and purple, late sum 

 mer) Beech Drops, Epifagns Yirginiana. 



Ib. Flowers sessile in a dense bracted spike (1 2 dm. high; flowers 



pale-yellow, early summer) 



Squaw-root, Conopholis americana. 

 Ic. Flowers 1 15, each on a long erect naked peduncle (1 2 dm. 



high; flowers yellowish or pale-violet, spring and summer) 



(Cancer-root) 2. 



2a. Stem erect and scaly, 5 10 cm. high 



Cancer-root, Orobanche fasciculata. 



2b. Stem very short, almost below the surface of the ground, 

 with long erect peduncles Cancer-root, Orobanche uniflora. 



