CONVOLVLLACEiE. (CONVOLVULUS P^AMILT.) 369 



I. PURPtjREA, Lam. (Common Morning-Glouv.) 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. 



•>r~ Leaves cordate, acuminate. 



1. lo 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. lacunosa, L. Annual ; rather smooth ; stem twining and creep- 

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

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

 sharply 5-lobed (white, i - J' long) corolla. — Hiver-banks and low grounds, 

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



-*- -*- Leaves linear ; not twining. 



3. I. leptophylla, 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 

 con vol vo, to entwine.) 



§ 1. CALYSTEGIA. Stigmas oval to oblong; cali/x 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 spithameea, 

 Piirsh.) — 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 (l|-2' long). 

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

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



Var. Amerie^nus, Sims. Glabrous ; corolla pink or rose-purple ; bracts 

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



