Stewart Herbarium, Gordon College, Rawalpindi
Herbs, annual or perennial. Leaves alternate (or opposite), entire or pinnate, exstipulate. Flowers in terminal Cymes, bisexual, actinomorphic. Sepals 5, more or less connate. Corolla of 5 united petals, tubular, funnel-, bell-, or salver-shaped, lobes contorted. Stamens 5, epipetalous, free, included or exserted; Anthers 2-celled, opening lengthwise. Carpels 3; ovary superior, inserted on a disk, 3-locular, sessile; ovules 1 or more in each locule. Style 1, filiform, stigmas 3. Fruit a loculicidal capsule.
An American family, with about 15 genera and 300 species, mainly in the western USA. Only 1 species wild in W.Pakistan.
Acknowledgement: We are grateful to the United States Department of Agriculture for financing this research under P.L. 480.