198 KEY AND FLORA 



Flowers variously clustered, rarely solitary, often large and 

 showy. Sepals 5. Corolla hypogynous, regular, tubular, bell- 

 shaped or funnel-shaped; its limb more or less 5-lobed or 

 angled. Stamens 5, inserted on the corolla tube. Ovary usu- 

 ally 2-4-celled ; style slender, 2-4-cleft ; ovules 1 or 2 in each 

 cell. Capsule 1-4-celled, 2-4-valved, or bursting open across 

 the base. 



I. IMPOMCEA L. 



Annuals or perennials ; stems often twining. Flowers showy. 

 Calyx not bracted at the base, of 5 sepals. Corolla bell-shaped 

 or funnel-shaped, twisted in the bud. Stamens not projecting 

 from the corolla. Style slender; stigma knobbed, 2-lobed. 

 Fruit a 2-3-celled capsule. [/. purpurea, the common morn- 

 ing-glory, blossoms too late for school study. /. Batatas, the 

 sweet potato, seldom flowers.] 



B. Fl. species 1 (Quamlocit). 



1. I. Quamlocit L. CYPRESS VINE. Stem slender, smooth, twin- 

 ing high. Leaves dark green, pinnately cut, the divisions linear, 

 smooth. Peduncles slender, as long as the leaves, 1-5-flowered ; 

 pedicels thickened upward. Sepals ovate or oblong, mucronate. 

 Corolla bright scarlet, or sometimes yellowish-white, salverform ; 

 the tube 1-1 \ in. long; the limb flat and spreading, | | in. wide. 

 Capsule ovoid, twice the length of the sepals. Common in gardens.* 



2. I. hederacea Jacq. WILD MORNING-GLORY. Stems hairy, twin- 

 ing. Leaves heart-shaped, 3-lobed. Peduncles 1-3-flowered. Calyx 

 very hairy below. Corolla showy, bluish-purple or white. Pod usu- 

 ally 3-celled, with 2 seeds in each cell. A weed in fields and about 

 dwellings. Introduced from tropical America. 



3. I. pandurata G. F. W. Mey. WILD POTATO VINE. Perennial, 

 from a very large, tuberous root; stem trailing or twining, smooth 

 or slightly downy, 5-10 ft. long. Leaves broadly heart-shaped, with 

 the apex slender and obtuse, sometimes fiddle-shaped or 3-lobed; 

 petioles slender. Peduncles longer than the petioles, 1-5-flowered. 

 Sepals oblong, obtuse, smooth, mucronate, the 2 outer ones shorter. 

 Corolla white with a purple throat, 2-3 in. wide, lobes pointed. Cap- 

 sule globose, 2-3-seeded, the seeds woolly on the angles. On dry or 

 damp sandy soil, along fences, railroad embankments, etc.; common 

 S. and W-* 



4. I. leptophylla Torrey. BUSH MORNING-GLORY. Perennial. 

 Stems smooth, much branched, erect, ascending or reclining, 2-4 ft. 



