184 FOUNDATIONS OF BOTANY 



shaped or somewhat lialberd-shaped, the lobes at tlie base trun- 

 cate. Flowers numerous and showy, white or tinged with rose-color. 

 Thickets and banks of streams, often cultivated. 



2. C. spithamasa, Pursh. Downy, stem 6-12 in. high, erect or 

 reclining. Leaves oblong, sometimes heart-shaped or eared at the 

 base. Flowers white. In sandy soil. 



II. CONVOLVULUS, L. 



Herbs or shrubs, with stems twining or nearly erect. Calyx 

 not braeted. Corolla broadly funnel-form or bell-shaped. 

 Stamens not projecting from the corolla. Style 1 ; stigmas 2, 

 thread-like ; ovary and pod 2-celled, 4-seeded. 



1. C. arvensis, L. Bindweed. A perennial, prostrate or climb- 

 ing herb, with many stems, from a long, slender rootstock. Leaves 

 very variable, more or less arrow-shaped, 1-3 in. long. Peduncles 

 mostly 1-flowered ; flowers white or pinkish, about | in. long. A 

 weed in fields E. ; introduced from Europe. 



in. QUAMOCLIT, Toum. 



Twining annual herbs. Sepals 5, mostly mucronate or 

 bristle-pointed. Corolla tubular, with a narrow, spreading 

 border. Stamens projecting. Style 1 ; stigma knobbed, 

 2-lobed. Pod 4-celled, the cells 1-seeded. 



1. Q. vulgaris, Choisy. Cypress Vine. Stem slender, smooth, 

 twining high. Leaves dark green, pinnately cut, the divisions lin- 

 ear, 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, salver-form, the 

 tube 1-1^ in. long, the limb flat and spreading, ^-| in. wide. Cap- 

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



IV. IMPOMCEA, L. 



Annuals or perennials ; stems often twining. Flowers 

 showy. Calyx not braeted 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. [7. purpurea, 

 the common morning-glory, blossoms too late for school study. 

 I. Batatas f the sweet potato, seldom flowers.] 



