Chapter I: PURPUREA, Lam. (COMMON MORNING-GLORY.) Annual, stems retrorsely

hairy; _leaves heart shaped, acuminate, entire_; peduncles long, umbellately 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._

[+] _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. lacunosa, L. Annual; rather smooth; stem twining and creeping, 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, 1/2--{1/3}' long) corolla.--River-banks and low grounds, Penn. to Ill., south to S. C. and Tex.

[+][+] _Leaves linear; not twining._

3 I. leptophylla, Torr. Perennial, very glabrous; stems erect or ascending (2--4 deg. 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 between 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.)

Sec. 1 CALYSTEGIA. _Stigmas oval to oblong; calyx enclosed in 2 broad leafy brats._

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 spithamaea, _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 (11/2--2' long). (Calystegia sepium, _R. Br._)--Moist alluvial soil, or along streams; N. Atlantic States and westward. (Eu., etc.)

Var. Americanus, Sims. Glabrous; corolla pink or rose-purple; bracts obtuse. (C. sepium of Am. authors mainly.)--Common, across the continent.

Var. repens, Gray. More or less pubescent; sterile and sometimes flowering stems extensively prostrate; leaves more narrowly sagittate or cordate, the basal lobes commonly obtuse or rounded and entire; corolla from almost white to rose-color; bracts very obtuse or acute. (Calystegia sepium, var. pubescens, _Gray_.)--Common.

Sec. 2. _Stigmas filiform; no bracts at or near the base of the calyx._