196 CONVOLVULACEAE. 



FamUy 74. CONVOLVULACEAE. 



Mostly twining or trailing herbs, often with milky juice; 

 leaves alternate; flowers regular, perfect, mostly showy; calyx 

 5-lobed; corolla gamopetalous, 5-plaited or lobed, convolute or 

 twisted in the bud; ovary 2-celled; ovules 2 in each cell, the cells 

 sometimes becoming 4 in the fruit by false partitions; fruit a 

 globular, 2-6-seeded capsule; endosperm mucilaginous. 



289. CONVOLVULUS. Morning Glory. 



Herbs or somewhat woody plants, twining, erect or prostrate; 

 flowers 1 or 2 in the axils of the leaves; corolla funnelform to 

 campanulate; stamens included; style undivided, or 2-cleft only 

 at the apex; capsules globose, 2-celled, or imperfectly 4-celled 

 by false partitions between the two seeds or by abortion 1-celled. 



Calyx enclosed by two large bracts. C. sepium. 



Calyx not bracted. C. arvensis. 



Convolvulus sepium L. Usually glabrous, climbing over shrubs to a 

 height of 2-3 m.; leaves sagittate or somewhat hastate, acuminate, 2-5 

 cm. long; basal lobes entire or angularly 2-lobed; peduncles nearly as long as 

 the leaves; calyx enclosed by two large ovate bracts; corolla white, sometimes 

 pink, 4-6 cm. long; stigmas capitate, oval or oblong. Banks of Snake River. 



Convolvulus arvensis L. Stems prostrate, trailing 30-120 cm. long; 

 whole plant pubescent; leaves oblong or ovate, obtuse or acute, 1-4 cm. long, 

 sagittate or hastate or auricled at base; petioles 1-2 cm. long; peduncles longer 

 than the leaves, mostly 1- or 2-flowered ; pedicels each with two small bracts; cor- 

 olla pinkish, 1-2 cm. long; stigmas thread-like. A troublesome weed, as yet 

 sparingly introduced. 



Family 75. CUSCUTACEAE. Dodder Family. 



Whitish or yellowish parasitic twining vines, with leaves reduced 

 to minute alternate scales; sepals 5, separate or united into a 

 5-lobed or parted calyx; corolla gamopetalous, urn-shaped or 

 bell-shaped, 5-lobed, usually with fimbriate or crenulate scales on 

 the tube alternating with the lobes; stamens 5, alternate with 

 the corolla-lobes; ovary globose to oblong, 2-celled; ovules 2 in 

 each cell ; capsule circumscissile or indehiscent, 1-4-seeded. 



290 CUSCUTA. Dodder. 



Leafless annual herbs with yellow or red stems, twining and 

 parasitic on the plants to which they cling; flowers small, clus- 

 tered ; calyx 4- or 5-cleft or of 5 sepals ; corolla urn- or bell-shaped, 

 4- or 5-cleft; stamens with a scale-like appendage at the base; 

 ovary 2-celled, 4-ovuled; capsule usually 4-seeded. 



