150 



COXYOLVULACEAE. 



Ovary 3-celled : stigmas 3. 



Calyx-lobes Imbricated : corolla mostly 



plaited in the bud. 

 Calyx-lobes valvate : corolla merely 

 convolute in the bud. 

 Styles or stigmas wholly united. 



Median axis of the gynoecium in the same 



axis as the stem : seeds mostly pitted. 



Median axis of the gynoecium not in 



the axis of the stem : seeds mostly 



tuberculate. 



Fruit drupaceous, or of 2 or 4 nutlets. 



Style or stigmas not furnished with a gland- 

 ular ring. 

 Style or stigmas furnished with a glandular 

 ring. 

 Stamens 4 and didynamous, or 1 or 2. 



Carpels ripening into a group of 4 nutlets, an 

 achene or a drupe. 

 Style apical on the lobeless ovary. 



Ovules erect, or laterally attached : gynoe- 

 cium ripening into a dry or fleshy fruit 

 with 2-S nutlets, the seeds with a testa. 

 Ovules pendulous from the top of a central 

 columella : gynoecium ripening into a fleshy- 

 capsular fruit with a solitary seed which 

 is destitute of a testa. 

 Style arising between the 4 lobes of the ovary. 

 Carpels ripening into a capsule. 

 Placentae of the ovary axile. 



Ovary 2-celIed, or rarely 3-5-celled. 



Corolla-lobes imbricated : capsules not 



elastically dehiscent. 

 Corolla-lobes convolute : capsules elastic- 

 ally dehiscent. 

 Ovary 1-celled. 

 Placentae of the ovary parietal. 



Film. 2. CONVOLVrLACEAE. 



Fam. 4. Poleiioxiaceae. 



Fam. 5. Solanaceae. 



Fam. 11. Rhinanthaceae. 



Fam. 6. Ehretiaceae. 

 Fam. 7. Heliotbopiaceae. 



Fam. 8. Verbexaceae. 



Fam. 9. Avicenniaceae. 

 Fam. 10. Lamia ceae. 



Fam. 11. Rhinanthaceae. 



Fam. 12. Acanthaceae. 

 Fam. 13. Pingciculaceae. 

 Fam. 14. Bignoniaceae. 



Pamily 1. DICHONDRACEAE. Dichoxdra Fajiily. 



Annual or i^erennial creeping herbs. Leaves alternate : blades broad, 

 entire, long-petioled. Flowers axillary, solitaiy. Calyx of 5 slightly 

 united sepals. Corolla rotate to campanulate, 5-lobed. Androecium of 5 

 stamens shorter than the corolla. Gynoecium of 2 distinct carpels. Styles 

 basal. Capsules utricle-like, 2 together. 



1. DICHONDRA Forst. Stems much-branched, often densely matted. 



Flowers erect. 



1. D. carolinensis Michx. Plant inconspicuously pubescent: leaf-blades reni- 

 form to suborbicular 5-20 mm. wide, deeply cordate: calyx-lobes 2-3 mm. 

 long: corolla-lobes obtuse. — Pinelands. — F. K. {Ber., Bah.) 



Family 2. CONVOLVULACEAE. Morning-glory Family. 



Annual or perennial herbs, or vines, or rarely shrubs or trees. Leaves 

 alternate, without stipules: blades various. Flowers perfect, regular, 

 solitai-y or cymose. Calyx of 5, more or less united sepals, in one or two 

 series. Corolla convolute in aestivation, its limb lobed or entire. Androe- 

 cium of 5 stamens, partially adnata to the corolla-tube, alternate with the 

 lobes. Gynoecium of 2 united carpels. Ovary 2-4-celled (rarely 5-celled, 

 or 1-celled by the breaking down of the septum). Seeds 1 or 2 in each 

 cavity, often pubescent. 



Styles distinct or partly so. 



Styles partially united, entire : stigmas 2. 1. Sttlisma. 



