CONVOLVl LACEi*:. (CDNVOIATI.IJS KA.MIF.Y.) 309 



I. PURPtTREA, Lam. (Common Moknixo-Gi.ory.) Annual ; stems rr;- 



trursely liairy; leaves li((irt-sh(iiwd, acuininnlc, mtirt' ; |ic(lnn(lcs lon;^, lunlx'l- 

 lately 3-5-llowered ; calyx I)ri8tly-hairy hflow ; curolhi funnel-form (2' long), 

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



* * Stigma 2-loljed or entire ; cells 2, each 2-seeded ; sejnds broader, imbricated. 



•i- Leaves cordate, acuminate. 



1. I. pandurata, Meyer. (Wild roxAXo-viNE. Man-of-thk-Ivvrth.) 

 Perennial, sniooth or nearly so when old, trailing or sometimea twiniug ; 

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

 longer than the petioles, 1 - 5-flowered ; sepals smooth, ovate-obloug, 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 twming and creej> 

 ing, slender; leaves entire or angled-lobed ; peduncles short, 1 -S-fiowered ; 

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

 sharply 5-lobed (white, ^- J' long) corolla. — Kiver-bauks and low grounds, 

 Peuu. to 111., south to 8. C. and Tex. 



■(- •»- Leaves linear ; not tivining. 



3. I. leptophylla, Torr. Perennial, very glabrous; stems erect or 

 ascending (2-4° higli), 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-forju 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. — Herlis or 

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

 convolve, to entwine.) 



§ 1. jPtLYSTEGIA. 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 spithamsea, 

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



2- C. sdpium, 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 scpiuni, /?. Dr.) — Moist alluvial soil, or along streams ; N. Atlan- 

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



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

 obtuse. (C. scpium of Ain, authors mainly.) — Common, across the continent, 



24 ' 



