Chapter L: ARVENSIS, L. (SMALL BUGLOSS.) Very rough-bristly (1 deg. high); leaves

lanceolate; flowers in leafy raceme-like clusters; calyx as long as the tube of the small blue corolla.--Dry or sandy fields, New Eng. to Va.; scarce. (Adv. from Eu.)

11. ECHIUM, Tourn. VIPER'S BUGLOSS.

Corolla with a cylindraceous or funnel-form tube, and a more or less unequal spreading 5-lobed border; lobes rounded, the expanded throat naked. Stamens mostly exserted, unequal. Style thread-form. Nutlets roughened or wrinkled, fixed by a flat base. (A name of Dioscorides, from [Greek: e)/chis], _a viper_.)

E. VULGARE, L. (BLUE-WEED.) Rough-bristly biennial; stem erect (2 deg. high), mostly simple; stem-leaves linear-lanceolate, sessile; flowers showy, in short lateral clusters, disposed in a long and narrow thyrsus; corolla reddish-purple changing to brilliant blue (rarely pale).--Roadsides and meadows of the Middle Atlantic States. June. (Nat. from Eu.)

ORDER 73. CONVOLVULACEAE. (CONVOLVULUS FAMILY.)

_Chiefly twining or trailing herbs, often with some milky juice, with alternate leaves (or scales) and regular 5-androus flowers; a calyx of 5 imbricated sepals, a 5-plaited or 5-lobed corolla convolute or twisted in the bud (imbricate in n. 6); a 2-celled (rarely 3-celled) ovary (or in one tribe 2 separate pistils), with a pair of erect ovules in each cell, the cells sometimes doubled by a false partition between the seeds, so becoming 4-celled; the embryo large, curved or coiled in mucilaginous albumen._--Fruit a globular 2--6-seeded capsule. Flowers mostly showy, on axillary peduncles; pedicels articulated, often 2-bracted. (Many are cultivated for ornament, and one, the Sweet Potato, for its edible farinaceous roots, those of several species are cathartic; e.g. Jalap.)

Tribe I. DICHONDREAE. Carpels 2 or 4, distinct or nearly so; styles 2 basilar. Creeping herbs.

1. Dichondra. Corolla deeply 5-cleft. Pistils 2, one-seeded.

Tribe II. CONVOLVULEAE. Ovary entire. Leafy plants, mostly twiners.

2. Ipomoea. Style undivided, with stigma capitate or 2--3-globose.

3. Convolvulus. Style undivided or 2-cleft only at apex; stigmas 2, linear-filiform to subulate or ovate.

4. Breweria. Style 2-cleft or 2-parted; the divisions simple; stigmas capitate.

5. Evolvulus. Styles 2, each 2-cleft; stigmas linear-filiform. Not twining.

Tribe III. CUSCUTEAE. Ovary entire. Leafless parasitic twining herbs, never green. Embryo filiform, coiled, without cotyledons.

6. Cuscuta. The only genus of the group.

1. DICHONDRA, Forst.

Calyx 5-parted. Corolla broadly bell-shaped, 5-cleft. Stamens included. Styles, ovaries, and utricular 1--2-seeded capsules 2, distinct. Stigmas thick.--Small and creeping perennial herbs, soft pubescent, with kidney-shaped entire leaves, and axillary 1-flowered bractless peduncles. Corolla small, yellowish or white. (Name from [Greek: di/s], _double_, and [Greek: cho/ndros], _a grain_, from the fruit.)

1. D. repens, Forst. Leaves round kidney-shaped, pubescent, green both sides; corolla not exceeding the calyx (1--11/2'' long).--Wet ground, Va. to Tex., near the coast.

2. IPOMOEA, L. MORNING GLORY.

Calyx not bracteate at base, but the outer sepals commonly larger. Corolla salver-form or funnel-form to nearly campanulate; the limb entire or slightly lobed. Style undivided, terminated by a single capitate or 2--3-globose stigma. Capsule globular, 4--6 (by abortion fewer) -seeded, 2--4-valved. (Name, according to Linnaeus, from [Greek: i)/ps], _a Bindweed_, and [Greek: o(/moios], _like_; but [Greek: i)/ps] is _a worm_.)

Sec. 1 QUAMOCLIT. _Corolla salver-form, or with somewhat funnel-form but narrow tube; stamens and style exserted; flowers red. Annual twiners._

I. QUAMOCLIT, L. (CYPRESS-VINE.) Leaves pinnately parted into linear-thread-shaped delicate parallel lobes; peduncles 1-flowered; corolla narrow, scarlet-red, or sometimes white. (Quamoclit vulgaris, _Choisy_.)--Sparingly spontaneous southward. (Trop. Amer., etc.)

I. COCCINEA, L. Leaves heart-shaped, acuminate, entire or angled, sepals awn-pointed; corolla light scarlet (1' long). (Quamoclit coccinea, _Moench_.)--River banks, etc., Ohio to Ill., Va., and southward. (Probably indigenous in N. Mex. and Arizona.)

Sec. 2. IPOMOEA proper. _Corolla funnel-form or nearly campanulate, contorted in the bud; stamens and style not exserted._

[*] (MORNING GLORY.) _Lobes of stigma and cells 3; sepals long and narrow, attenuate upward, mostly hirsute below, corolla purple, blue, and white._

I. HEDERACEA, Jacq. Stems retrorsely hairy, _leaves heart-shaped, 3-lobed_, the lobes acute or acuminate; peduncles short, or rather long, 1--3-flowered; calyx densely hairy below; corolla white and purple or pale blue (1--11/2' long). (I. Nil. of Manual, not _Roth_.)--Waste and cultivated ground, Penn. to Fla., and La. (Trop. Amer.)