88 Convolvulaceae, Polemoniaceae 



Order 5. Tubiflorae. Mostly herbs. Flowers 

 typically with four isomerous whorls, but the gynaecium 

 usually shows reduction. When zygomorphic the 

 androecium too shows reduction. Stamens epipetalous. 

 Ovules with one integument. 



Suborder i. CONVOLVULINEAE. Leaves mostly 

 spiral. Flowers usually actinomorphic. Carpels with 

 few, often only two, ovules, micropile facing downwards. 

 Fruit seldom separating into nutlets (never in British 

 genera). 



Fam. I. Convolvulaceae. Often left-handed 

 twiners. Flowers often conspicuous, 5-4-merous. Co7'olla 

 mostly induplicate valvate in bud. Stamens inserted at 

 base of corolla-tube. Carpels (2), each with two basal 

 erect ovules. Styles separate or united. Fruit usually 

 capsular. 



Subfamily i. Convolvuloideae . Autotrophic, with 

 green foliage leaves. Corolla without scales. 



Tribe Convolvuleae. Style i. Capside dehiscent, 

 4-seeded. 



Bracteoles small. Stigma slender. Convolvulus. 

 Bracteoles large, enclosing calyx. Stigma broad. 



Calystegia. 



Subfamily 2. Cuscutoideae. Leafless parasites. 

 Corolla usually with ring of scales beneath the stamens. 

 Only genus : Cuscuta. 



Fam. 2. Polemoniaceae. Herbs, rarely shrubs. 

 Leaves spiral, exstipulate, sometimes pinnate. Flowers 

 5-merous, usually actinomorphic. Corolla usually twisted 

 to right in bud. Ca7pels (3), each with usually 00 ovides. 

 Style I, trifid. Capside mostly loculicidal. 



