MORNING-GLORY FAMILY 677 



TMckets and fence-rows: N.S.—N.C.—N.^L— Wash.— B.C. Plain— Suhmont. 

 My-Au. 



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

 long, den.sely and softly pubescent: leaf -blades deltoid or hastate-ovate, 2.5-4 

 cm. long, glabrous above, pubescent beneath: base shaUowly cordate or tnineate; 

 bracts broadly ovate, obtuse, cIo.5ely investing the cab's: coroUa white. 3..S-4 cm. 

 long, the limb entire, 3—1 cm. broad. Sandv soil: N.D.— Okla. — Ariz. — Colo. 

 Plain. My-Jl. 



7. C. Macounii Greene. Stem erect. 7-1.5 cm. high, glabrous: leaves 

 broadly sagiitLiTe. about 5 cm. long, glabroas: bracts broad, oval, obtuse, 2-2.5 

 cm. long, auricled at the base; coroUa white, fully 5 cm. long. Sandv soil: 

 Sask.— B.C. Plain. Au. 



F.vMiLT 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 c\Tnes. Cah-x inferior; sepals 

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

 globose, o-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 -i, partly adnate to the coroUa: anthers 2-ceUed. Styles 2, 

 mostly distinct: stigmas capitate or elongate. Capsule subglobose or 

 ovoid. 2-celled, circumscissile or bursting irregularh\ Embryo cur\-ed or 

 spiral, in a fleshy endosperm. 



1. CUSCUTA (Toum.) L. Dodder, Lo^-e-vine, Corai/-vine. 



Characters of the famil3^ 



Stigmas elongate, linear: styles equal; capsule circumscissile. 



CoroUa globose-iirceolate; scales inside the corolla crenate. 1. C. gracilis. 



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



Calj-x-lobes obtuse. ' 2. C. planiiJora. 



Calj-s-lobes acute. 3. C. Anthemi. 



Stigmas capitate: styles usiially unequal. 



Capsule circumscissUe: calyx and corolla-lobes acuminate; inflorescence umbel-like. 



4. C. umbellata. 

 Capsule indehiscent or bursting irregularly. 

 Calj-x gamosepalous. usually not bracted. 

 Capsule depressed-globose. 



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



Calj-x-lobes acute or acuminate: corolla-lobes erect or somewhat spread- 

 ing, in fruit connivent: flowers pediceUed. 5. C. californica. 

 Calj-x-lobes rounded; coroUa-lobes strongly spreading with inflexed tips; 

 flowers subsessUe. 6. C. arrensis. 

 Lobes of the coroUa oblong, very obtuse. 



CoroUa deeply campanulate, 4-merous, about 2 nun. wide; tube longra- 



than the calj-x. 7. C. cephalanthi. 



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

 calj-x. 8. C. plattensis. 



Capsule ovoid-globose, acute. 

 CoroUa-lobes not incurved. 



Lobes of the coroUa and the calyx obtuse. 



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



denticulate. " 9. C. dcnUculata. 



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



.Scales in cursed over the ovary; styles about half as long as 



the ovary or longer. " " 10. C. Gronorii. 



Scales appressed to the coroUa-tube; styles one-third to one>- 

 fourth as long as the ovarj-. ' 11. C. curia. 



Lobes of the coroUa and calj"x acute. 12. C. salina. 



CoroUa-lobes inciured at the apes. 



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



13. C. indecora. 



