106. Hydro I'll VLLACEAE 191 



5. Cuscuta L. — Dodder 

 1. Sepals nearly or quite separate. 



2. Flowers cymose, pedicelled; scales short; bracts entire; on vari- 

 ous herbs. Aug. -Sept C. cuspidata Engehn. 



2. Flowers sessile in dense clusters; bracts serrulate. 



3. Styles as long as the ovary; bracts few, broad, appressed; 



parasitic on various shrubs and herbs. July-Oct 



C. compacta Juss. 



3. Styles longer than the ovary; bracts numerous, narrow, their 

 tips recurved; chiefly on Solidago, Aster, Helianthus, and 



other genera of Compositae C. glomcrata Choisy 



1. Sepals united below into a synsepalous calyx. 

 4. Flowers nearly sessile. 

 5. Corolla-scales fimbriate. 



6. Flowers 1.5 mm long; calyx-lobes overlapping, forming 

 angles at the sinuses; seeds depressed-globose, 1 mm 

 long; on various herbs and shrubs. June-Oct. \C. arv en- 

 sis Beyr.] C. pentagona Engelm. 



6. Flowers 2-3 mm long; calyx-lobes not overlapping; seeds 

 ovoid, 1.5 mm long; parasitic on various herbs. June- 

 Oct C. campestris Yuncker 



5. Corolla-scales obsolete; calyx-lobes acutish; on Polygonum 



and other herbs. Aug.-Oct C. polygonorum Engelm. 



4. Flowers distinctly short-pedicelled. 

 7. Corolla-lobes with inflexed tips. 



8. Scales ovate, fimbriate; capsule enclosed by the corolla; on 

 herbs and low shrubs, chiefly Compositae and Legumi- 



nosae; known from St. Clair and Wabash counties 



-- C. indecora Choisy 



8. Scales obsolete; withered corolla remaining at the base of 



the capsule; parasitic on hazel (Corylus) and other 



shrubs, and on various herbs. Aug.-Oct 



C. coryli Engelm. 



7. Corolla-lobes not inflexed. 



9. Flowers usually 4-merous; styles about as long as the ovary; 



scales small, irregularly fimbriate; capsule depressed glo- 

 bose; on various herbs and shrubs. Aug.-Oct 



C. ceplialanthi Engelm. 



9. Flowers 5-merous; styles shorter than the ovaiy; scales long, 

 fimbriate toward the apex; capsule ovoid; parasitic on 

 a number of different species of herbs and shrubs. July- 

 Oct C. gronovii Willd. 



106. Hydrophyliaceae Lindl. — Waterleaf Family 



1. Leaves not entire. 



2. Flowers solitary on short pedicels; stamens included 1. Ellisia 



