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184 FOUNDATIONS OF BOTANY 
shaped or somewhat halberd-shaped, the lobes at the base trun- 
cate. Flowers numerous and showy, white or tinged with rose-color. 
Thickets and banks of streams, often cultivated. 
2. C. spithamza, 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. 
Il. CONVOLVULUS, L. 
Herbs or shrubs, with stems twining or nearly erect. Calyx 
not bracted. 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. BrinpWeEEpD. 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 2 in. long. A 
weed in fields E.; introduced from Europe. 
Ill. QUAMOCLIT, Tourn. 
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, }—3 in. wide. Cap- 
sule ovoid, twice the length of the sepals. Common in gardens.* 
Iv. IMPOMEA, 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. [J. purpurea, 
the common morning-glory, blossoms too late for school study. 
I. Batatas, the sweet potato, seldom flowers. | 
