This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol3", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
Herbs, mostly perennial and procumbent, with entire short-petioled or sessile leaves, and 1-5-flowered axillary peduncles; flowers white, purple, pink, or yellow. Sepals acute or obtuse. Corolla campanulate or funnelform-campanulate; limb plaited, 5-angled or slightly 5-lobed. Stamens included; filaments filiform, or dilated at the base. Ovary 2-celled; style 2-cleft or 2-parted; stigmas capitate. Capsule globose to ovoid, 2-celled, 2-4-valved. Style rarely 3-parted and ovary 3-celled. Seeds 1-4, glabrous or pubescent. [Greek, referring to the 2-parted style.]
Seven known species, of the southeastern United States and Mexico. In our first edition this genus was referred to the Australian Breweria R. Br. Type species: Convolvulus aquaticus Walt.
Sepals acute or acuminate; leaves oblong, elliptic or linear.
Corolla white; filaments pubescent: plant pubescent or puberulent.
1. S. humistrata.
Corolla purple; filaments glabrous; plants silky-tomentose.
2. S. aquatica.
Sepals obtuse; leaves narrowly linear.
3. S. Pickeringii,
Convolvulus humistratus Walt. Fl. Car. 94. 1788. Stylisma humistrata Chapm. Fl. S. States, 346. 1860. Bonamia humistrata A. Gray, Man. Ed. 5, 376. 1867. Breweria humistrata A. Gray, Syn. Fl. 2: Part 1, 217. 1878.
Pubescent or puberulent; stems slender, 1°-2° long, simple, or with a few long branches. Leaves elliptic, oblong-elliptic, or ovate-oblong, obtuse and mucronulate or some of them emarginate at the apex, subcordate, rounded or narrowed at the base, 1/2'-l' wide, 1-2' long; petioles 1"-3" long; peduncles slender, longer than the leaves, 1-7-flowered, minutely bracted at the summit; sepals glabrous or puberulent, oblong, acuminate, 2"-3" long; corolla white, 6"- 8" long; filaments pubescent; style 2-cleft; capsule ovoid, acute, glabrous, about as long as the calyx.
In dry pine barrens, Virginia to Florida and Louisiana. May-Aug.
Convolvulus aquaticus Walt. Fl. Car. 94. 1788. Stylisma aquatica Chapm. Fl. S. States, 346. 1860. Bonamia aquatica A. Gray, Man. Ed. 5, 376. 1867. Breweria aquatica A. Gray, Syn. Fl. 2: Part 1, 217. 1878.
Finely and densely silky-tomentose, branched, the branches long and slender. Leaves oblong, elliptic or oblong-lanceolate, obtuse at both ends, mucronate or emarginate at the apex, sometimes subcordate at the base, 1/2'-1 1/2' long, 2"-8" wide; peduncles 1-3-flowered, longer than the leaves, minutely bracted at the summit; sepals densely silky-tomentose, oblong, acute or acuminate, about 2" long; corolla purple or pink, 5"-7' long; filaments glabrous; style 2-parted nearly to the base.
In wet soil, especially in pine barrens, Missouri to Texas, east to North Carolina and Florida. May-Aug.
Convolvulus Pickeringii M. A. Curtis, Bost. Journ. Nat. Hist. 1: 129. 1837.
Stylisma Pickeringii A. Gray, Man. Ed. 2, 335. 1856. Bonamia Pickeringii A. Gray, Man. Ed. 5, 376. 1867. Breweria Pickeringii A. Gray, Syn. Fl. 2: Part 1,217. 1878.
Etem pubescent or puberulent, very slender, simple or branched, 1°-2° long. Leaves puberulent or glabrous, narrowly linear, obtuse or acutish at the apex, narrowed at the base, 1'-2 1/2' long, 1/2"-2" wide, the lowest sometimes narrowly spatulate; petioles very short; peduncles slender, about as long as the leaves, with 1 or 2 linear bracts at the summit which are usually longer than the pedicels and calyx; sepals pubescent or hirsute, ovate to oval, obtuse, about 2" long; corolla white, about 1' long; filaments nearly glabrous; style 2-cleft, above, exserted; capsule ovoid, acute, pubescent, longer than the calyx.
In dry pine barrens, New Jersey to North Carolina; Illinois to Iowa, Louisiana and Texas. June-Aug.