150 



COX VOLVULACEAE. 



Ovary 3 -eel led : 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 gynoeclum in the same 

 axis as the stem : seeds mostly pitted. 

 Median axis of the gynoeclum 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 



Stamens 4 and dldynamous, or 1 or 2. 



Carpels ripening Into a group of 4 nutlets, an 



acbene or a drupe. 

 Style apical on the lobeless ovary. 



Ovules erect, or laterally attached : gynoe- 

 clum ripening into a dry or fleshy fruit 

 with 2-8 nutlets, the seeds with a testa. 

 Ovules pendulous from the top of a central 

 columella : gynoeclum 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-celled, or rarely 3-5-celled. 



Corolla-lobes imbricated: capsules not 



elastlcally dehiscent. 

 Corolla-lobes convolute: capsules elastic- 

 ally dehiscent. 

 Ovary 1 -eel led. 

 Placentae of the ovary parietal. 



Fam. 2. COXVOLM-LACEAB. 

 Fam. 4. POLEMOXIACEAE. 



Fam. C. SOLAXACEAE. 

 Fam. 11. RHIXAXTHACEAE. 



Fam. 6. EHRETIACEAE. 

 Fam. 7. HELIOTBOPIACEAE. 



Fam. 8. V 



Fam. 9. AVICENSIACEAE. 

 Fam. 10. LAMIACCAE. 



Fam. 11. RHIXANTHACEAE. 



Fam. 12. ACAXTHAOEAE. 



Fnm. IX PIN.. i i. i LA( i M 

 Fam. 14. BIGXUXIACEAB. 



FAMILY 1. DICHONDRACEAE. DICHONDRA FAMILY. 



Annual or perennial creeping herbs. Leaves alternate: blades broad, 

 entire, long-petioled. Flowers axillary, solitary. 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. B 

 basal. Capsules utricle-like, 2 together. 



Steins much-branched, often densely matted. 



1. DICHONDRA Font. 

 Flowers erect. 



1. D. carolinensis Michz. 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. I.. ,i\. < 

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

 solitary 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 adnate to the corolla-tube, alternate with the 

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

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

 cavity, often jmli. 



Styles distinct or partly so. 



Style* partially united, entire : stigmas 2. 



1. STTLISMA. 



