958 CONVOLVULACEAE 



2-3 mm. long, obtuse : corolla greenish white, 5-6 mm. broad : capsules 2-2.5 ram. high, 

 utricle-like. 



In low grounds, Virginia to Florida and Texas. Also widely distributed in tropical America and 

 the Old World. Spring to fall. 



Family 2. CONVOLVULACEAE Vent. Morning-glory Family. 



Annual or perennial herbs or vines, or rarely shrubs or trees. Leaves al- 

 ternate, without stipules : blades various. Flowers perfect, regular, sometimes 

 solitary, often in cymes. Calj'x of 5 more or less united sepals ; these imbri- 

 cated, persistent, equal or unequal, in one or two series. Corolla superior, con- 

 volute in aestivation, its limb often entire, after flowering often involute. An- 

 droecium of 5 stamens partially adnate to the corolla-tube, alternate with the 

 lobes. Filaments often of the same length, commonly enlarged at the base and 

 pubescent. Anthers 2-celled, erect or incumbent. Gynoecium free, of 2 united 

 carpels. Ovary 2-5-celled, seated in a fleshy disk. Styles often united. Stigma 

 simple, acute or capitate, sometimes 2-lobed. Ovules erect, solitary or two in 

 each cavity. Fruit a 2-4-celled or 5-celled capsule (or by breaking down of the 

 septum 1-celled). Seeds large, usually fewer than the ovules, with a mem- 

 branous or coriaceous testa, often villous. Endosperm mucilaginous. Embryo 

 curved, with foliaceous usually crumpled or plaited cotyledons. 



styles distinct or partly so. 



Styles nearly distinct or partially united, entire. 



Corolla plaited : stamens included : vines. 1. Breweria. 



Corolla not plaited : stamens exserted : erect herbs. 2. Cressa. 



Styles distinct, each 2-cleft. 3. Evolvulus. 



Styles united to the stigma. 

 " Stigmas ovoid or subglobose. 

 • Corolla salverform : stamens and style exserted. 



Corolla-tube slender-cylindric : limb very broad. 4. Calonyction. 



Corolla-tube narrowlyfunnelform : limb narrow. 5. Quamoclit. 



Corolla funnelform or campanulate : stamens and style included. 

 Stigma subglobose. 



Sepals blunt to acuminate : ovary 2 or 4-celled : capsule 4-seeded. 6. Ipomoea. 



Sepals with long tips : ovary 3 or" 5-celled : capsules 6 or 10-seeded. 7. Pharbitis. 



Stigmas somewhat flattened. 8. Jacquemontia. 



Stigmas filiform or oblong-cylindric. 9. Convolvulus. 



1. BRE-WERIA R. Br. 



Perennial herbs, with prostrate or twining stems. Leaves alternate : blades very nar- 

 row or broad, entire. Flowers 1-5, terminating axillary peduncles. Calyx often pubescent : 

 sepals 5, slightly united at the base. Corolla white, pink, purple or yellow, campanulate 

 or funnelform-campanulate : limb plaited, 5-angled or slightly 5-lobed. Stamens 5, in- 

 cluded : filaments filiform or dilated at the base. Ovary 2-celled. Styles wholly or par- 

 tially united. Stigmas capitate. Capsule 2-celled, seated in the calyx, 2-4-valved. Seeds 

 1-4, sometimes pubescent. The plants flower from spring to fall. 



Sepals fully 2 cm. long : capsules over 10 mm. long. 1. B. grandifnia. 



Sepals less than 1 cm. long : capsules less than 10 mm. long. 

 Sepals glabrous or nearly so, sometimes ciliate. 



Leaf-blades narrowly linear. 2. B. angmtifolia. 



Leaf -blades oblong. 3. B. Immistrata. 



Sepals densely pubescent. 

 Filaments pubescent. 



Foliage sparingly pubescent : mature peduncles 1-3 cm. long : corollas 



about 1.5 cm, long. 4. B. trichosantlies. 



Foliage densely brown-tomentose : mature peduncles 4-6 cm. long : corollas 



about 2 cm. long. 5. B. villosa. 



Filaments glabrous or nearly so. 



Leaf-blades oblong to narrowly lanceolate. 6. B. aquatica. 



Leaf-blades narrowly linear, or slightly broadest above the middle. 7. B. Pickeringii. 



1. Breweria grandiflora A. Gray. Foliage softly pubescent. Stems trailing, 0.5-3 

 m. long, simple or branching : leaf -blades leatliery, oblong, ovate or oval, 2.5-5 cm. long, 

 usually apiculate, entire, rounded or cordate at the base ; petioles 1-5 mm. long : pedicels 

 about ■> as long as the ])eduncles : bracts linear or oblong : sepals lanceolate, oblong or 

 ovate-lanceolate, acute, 2-2.5 cm. long : corolla light blue, 6-7 cm. long, 7-10 cm. broad : 

 capsules ovoid or globose-ovoid, 1.2-1.5 cm. long, 4-seeded. 



In sandy soil, peninsular Florida. 



