CONVOLVULACE^E. (CONVOLVULUS FAMILY.) 369 



I. ruRptiREA, Lam. (COMMON MORNING-GLORY.) Annual; stems re- 

 trorsely hairy ; leaves heart-shaped, acuminate, entire ; peduncles long, umbel- 

 lately 3-5-flowered; calyx bristly-hairy below ; corolla funnel-form (2' long) 

 purple, varying to white. Escaped in cultivated grounds. (Trop. Amer.) 



* * Stigma 2-lobed or entire ; cells 2, each 2-seeded ; sepals broader , imbricated. 

 i- Leaves cordate, acuminate. 



1. I. pandurata, Meyer. (WILD POTATO-VINE. MAN-OF-THE-EARTH.) 

 Perennial, smooth or nearly so when old, trailing or sometimes twining ; 

 leaves occasionally contracted at the sides so as to be fiddle-shaped ; peduncles 

 longer than the petioles, 1 - 5-flowered ; sepals smooth, ovate-oblong , very obtuse ; 

 corolla open-funnel-form (3' long), white with purple in the tube. Dry 

 ground, Conn, to Mich., south to Fla. and Tex. June - Aug. Stems long 

 and stout, from a huge root, which often weighs 10-20 pounds. 



2. I. lacunbsa, L. Annual ; rather smooth ; stem twining and creep- 

 ing, slender; leaves entire or angled-lobed ; peduncles short, 1 - 3-flowered ; 

 sepals lance-oblong, pointed, bristly -ciliate or hairy, half the length of the 

 sharply 5-lobed (white, - ^ long) corolla. River-banks and low grounds, 

 Penn. to 111., south to S. C. and Tex. 



-- - Leaves linear; not twining. 



3. I. leptoph^lla, Torr. Perennial, very glabrous; stems erect or 

 ascending (2-4 high), with slender recurving branches, from an immense 

 root (weighing 10-100 pounds) ; leaves 2 -4' long, 2 -3" wide, short-petioled, 

 acute ; peduncles short, 1 - 2-flowered ; sepals broadly ovate, very obtuse, outer 

 ones shorter; corolla pink-purple, funnel-form, about 3' long. Plains of 

 Neb. to central Kan., Tex., and westward. 



3. CONVOLVULUS, Tourn. BINDWEED. 

 Corolla funnel-form to campanulate. Stamens included. Style undivided 

 or 2-cleft only at the apex ; stigmas 2, linear-filiform to subulate or ovate. 

 Capsule globose, 2-celled, or imperfectly 4-celled by spurious partitions be- 

 tween the 2 seeds, or by abortion 1 -celled, mostly 2 - 4-valved. Herbs or 

 somewhat shrubby plants, either twining, erect, or prostrate. (Name from 

 convolvo, to entwine.) 



1. CALYSTlSGIA. Stigmas oval to oblong; calyx enclosed in 2 broad 



leafy bracts. 



1. C. spithamaeus, L. Downy; stem low and mostly simple, upright 

 or ascending (6 -12' long); leaves oblong, with or without a heart-shaped or 

 auricled base ; corolla white (2' long) ; stigmas oval. (Calystegia spithamsea, 

 Pursh.) Dry and sandy or rocky soil; not rare. 



2. C. sepium, L. (HEDGE BINDWEED.) Glabrous, or more or less 

 pubescent ; stem twining or sometimes trailing extensively ; leaves triangular- 

 halberd-shaped or arrow-shaped, acute or pointed, the basal lobes obliquely 

 truncate and often somewhat toothed or sinuate-lobed ; peduncles 4-angled ; 

 bracts commonly acute; corolla white or tinged with rose-color (H-2' long). 

 (Calystegia sepium, R. Br.) Moist alluvial soil, or along streams ; N. Atlan- 

 tic States and westward. (Eu., etc.) 



Var. AmericanilS, Sims. Glabrous ; corolla pink or rose-purple ; bracts 

 obtuse. (C. sepium of Am. authors mainly.) Common, across the continent. 



