MORNING-GLORY FAMILY 677 



Thickets and fence-rows: N.S. N.C. N.M. Wash. B.C. Plain Submont. 

 My-Au. 



6. C. interior House. Stems prostrate or somewhat climbing, 2-8 dm. 

 long, densely and softly pubescent; leaf -blades deltoid or hastate-ovate, 2.5-4 

 cm. long, glabrous above, pubescent beneath; base shallowly cordate or truncate; 

 bracts broadly ovate, obtuse, closely investing the calyx; corolla white, 3.5-4 cm. 

 long, the limb entire, 3-4 cm. broad. Sandy soil: N.D. Okla. Ariz. Colo. 

 Plain. My-Jl. 



7. C. Macounii Greene. Stem* erect, 7-15 cm. high, glabrous; leaves 

 broadly sagittate, about 5 cm. long, glabrous; bracts broad, oval, obtuse, 2-2.5 

 cm. long, auricled at the base; corolla white, fully 5 cm. long. Sandy soil: 

 Sask B.C. Plain. Au. 



FAMILY 108. CUSCUTACEAE. DODDER FAMILY. 



Herbaceous parasites, with twining stems, at first germinating in the 

 ground, but soon attaching themselves to some other plant by means of 

 aerial rootlets, and taking their nourishment from these, the lower part of 

 the stem having decayed early. Leaves reduced to minute alternate scales. 

 Flowers perfect, regular, in compact or open cymes. Calyx inferior; sepals 

 5, or rarely 4, distinct or more or less united. Corolla campanulate or sub- 

 globose, 5-lobed, or rarely 4-lobed, the lobes being imbricate, usually with 

 crenulate or fringed scales in the throat, alternating with the lobes. Sta- 

 mens 5, rarely 4, partly adnate to the corolla; anthers 2-celled. Styles 2, 

 mostly distinct; stigmas capitate or elongate. Capsule subglobose or 

 ovoid, 2-celled, circumscissile or bursting irregularly. Embryo curved or 

 spiral, in a fleshy endosperm. 



1. CUSCUTA (Tourn.) L. DODDER, LOVE-VINE, CORAL-VINE. 

 Characters of the family. 



Stigmas elongate, linear; styles equal; capsule circumscissile. 



Corolla globose-urceolate; scales inside the corolla crenate. 1. C. gracilis. 



Corolla open-campanulate; scales inside the corolla deeply fringed. 



Calyx-lobes obtuse. 2. C. planiflora. 



Calyx-lobes acute. 3. C. Anthemi. 



Stigmas capitate; styles usually unequal. 



Capsule circumscissile; calyx and corolla-lobes acuminate; inflorescence umbel-Lke. 



4. C. umbellata. 



Capsule indehi scent or bursting irregularly. 

 Calyx gamosepalous, usually not bracted. 

 Capsule depressed-globose. 



Lobes of the corolla triangular or lanceolate, acuminate or acute. 



Calyx-lobes acute or acuminate; corolla-lobes erect or somewhat spread- 

 ing, in fruit connivent; flowers pedicelled. 5. C. calif arnica. 

 Calyx-lobes rounded; corolla-lobes strongly spreading with inflexed tips; 



flowers subsessile. 6. C. arvensis. 



Lobes of the corolla oblong, very obtuse. 



Corolla deeply campanulate, 4-merous, about 2 mm. wide; tube longer 



than the calyx. 7. C. cephalanthi. 



Corolla open-campanulate, about 4 mm. wide; tube shorter than the 



calyx. 8. C. plattensis. 



Capsule ovoid-globose, acute. 

 Corolla-lobes not incurved. 



Lobes of the corolla and the calyx obtuse. 



Flowers less than 2mm. long; calyx-lobes very short, rounded and 



denticulate. 9. C. denticulata. 



Flowers 2.5-3 mm. long; calyx-lobes ovate, not denticulate. 



Scales incurved over the ovary; styles about half as long as 



the ovary or longer. 10. C. Gronovii. 



Scales appressed to the corolla-tube; styles one-third to one- 

 fourth as long as the ovary. 11. C. curia. 

 Lobes of the corolla and calyx acute. 12. C. salina. 

 Corolla-lobes incurved at the apex. 



Capsule 4 mm. or less broad; inflorescence rather open. 



13. C. indecora. 



