298 CONVOLVULACEAE. 



Ovary 1-celled ; style 1, 2-lobed, or 2-parted ; 



herbs not twining. Fam. 4. HYDROPHYLLACEAE. 



Ovary deeply 4-lobed around the style, or not lobed 



(Heliotropium). 



Style arising from between the ovary-lobes. Fam. 5. BORAGINACEAE. 



Ovary not lobed ; styles terminal. Fam. 6. EHKETIACEAE. 



b. Corolla irregular, more or less 2-lipped (regular in Solanaceae, in Mentha of the 

 Lamiaceae, and nearly or quite so in Verbena and Callicarpa of the Verbenaceae). 



1. Carpels 1-2-seeded. 



Ovary not lobed, 2-4-celled, the style apical ; carpels 



separating into 1-seeded nutlets. Fam. 7. VERBENACEAE. 



Ovary 4-lobed around the style, the lobes ripening 



into 1-seeded nutlets. Fam. 8. LAMIACEAE. 



2. Carpels several-many-seeded (2-seeded in some Acanthaceae). 

 J Fruit a berry, or more commonly a capsule which is 1-2-celled, 2-valved, clrcum- 



scissile, or irregularly bursting, not elastically dehiscent. 

 Placentae axile. 



Flowers regular ; fertile stamens 5 (4 in 



Petunia) ; fruit a berry or capsule. Fam. 9. SOLANACEAE. 



Flowers more or less irregular ; fertile stamens 



2 or 4 (5 in Verbascum) ; fruit a capsule. Fam. 10. SCROPHULARIACEAE. 



Placentae parietal. 



Trees, shrubs, or woody vines; capsule 2-celled. Fam. 11. BIGNONIACEAE. 

 Herbs or shrubs; capsule 1-celled. Fam. 12. GESNERIACEAE. 



${ Capsule completely 2-celled, elastically loculicidally dehiscent ; opposite-leaved 



herbs ; placentae axile. Fam. 13. ACANTHACEAE. 



3. Ovary 2-celled with 1 ovule in each cavity ; trees or shrubs with alternate leaves. 



Fam. 14. MYOPORACEAE. 



4. Ovary and fruit 1-celled with 1 erect orthotropous ovule and seed ; herb with 



spicate flowers and reflexed fruits. 



Fam. 15. PHRYMACEAE. 



Family 1. CONVOLVULACEAE Vent. 

 MORNING-GLORY FAMILY. 



Herbs or vines, some tropical species shrubs or trees, with alternate 

 estipulate leaves, and regular perfect axillary cymose or solitary flowers. 

 Calyx inferior, 5-parted or 5-divided, usually persistent, the segments or 

 sepals imbricated. Corolla gamopetalous, the limb 5-angled, 5-lobed or 

 entire. Stamens 5, inserted low down on the tube of the corolla and alter- 

 nate with its lobes, all anther-bearing, the filaments filiform, or dilated at 

 the base; anthers 2-celled, the sacs longitudinally dehiscent. Disk annular 

 or none. Ovary superior, sessile, 2-3-celled, with 2 ovules in each cavity, 

 or falsely 4-6-celled with a single ovule in each cavity, entire or 2-A- 

 divided; styles 1-3, terminal, or arising from between the ovary-divisions; 

 ovules anatropous. Fruit a 2-4-valved capsule or of 2-4 distinct carpels, 

 in our species. Seeds erect, the testa villous, pubescent or glabrous ; em- 

 bryo plaited or crumpled; cotyledons foliaceous; endosperm fleshy or car- 

 tilaginous, usually scanty. About 45 genera and probably 1000 species, of 

 wide distribution. 



Capsule dehiscent, several-seeded. 1. Ipomoea. 



Fruit woody, indehiscent, mostly 1-seeded. 2. Turbina. 



1. IPOMOEA L. 



Twining trailing or rarely erect herbs with large showy axillary flowers. 

 Corolla funnelform or campanulate, the limb entire, 5-angled or 5-lobed, the 

 tube plaited. Stamens included. Ovary entire, 2-4-celled, 4-6-ovuled ; style 

 filiform, included; stigmas 1 or 2, capitate or globose. Capsule usually septi- 

 fragally 2-4-valved,, 2-4-seeded. [Greek, worm-like.] About 400 species, of 

 wide distribution. Type species: Ipomoea Pes-tigrinis L. 



