262 FLORA OF PHILADELPHIA. 



4. VINCETOXICUM Walt. 



1. ViNCETOXicuM OBLIQUUM (Jacq.) Britton. M. p. 748. Thickets. Sum- 

 mer. 

 Philadelphia— FaiTmovmt Park, Manayunk, Dr. J. B. Brinton (He.), 

 Belmont (Te.), mouth of Wissahickon, not seen recently (Wn.). Mont- 

 ^omerj/— Lafayette, Ivy Eock (Wn.). Delaware— {V.). Chester— Green- 

 tree (Te.), Valley Forge (VP.). Lancaster— (P.). 



Periploca Graeca L. Cultivated. 



Philadelphia— Byherr J, Mart. (B.C.). Delaivare— Painters' 

 Arboretum (Fu.). 



Orders. POLEMONIALES. 



CJorolla regular (irregular in Echium of Boraginaceae). 



Ovary not 4-lobed, the carpels not separating as distinct nutlets at 

 maturity. 

 Ovary 2-celled, rarely 3-4-celled; style 1, entire, 2-cleft or 2-parted; 

 mostly twining vines. 

 Leaves normal. Fam. 1. Convolvulaceae. 



White or yellowish parasitic vines, the leaves reduced to minute 

 scales. Fam. 2. Cuscutaceae, 



Ovary 3-celled; stigmas 3, linear; herbs, not twining. 



Fam. 3. Polemoniaceae. 

 Ovary 1-celled; style 1-2-lobed or parted; herbs, not twining. 



Fam. 4. Hydrophyllaceae; 

 Ovary deeply 4-lobed around the style, or not lobed (Heliotropium) ; 

 carpels separating as nutlets. Fam. 5. Boraginaceae. 



Corolla irregular, more or less 2-lipped (regular in Solanaceae, Mentha and 

 Lycopus, and nearly or quite so in Verbena). 

 Carpels 1-2-seeded. 



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



1-seeded nutlets. Fam. 6. Verbenaceae. 



Ovary 4-lobed around the style, the lobes ripening into 1-seeded 

 nutlets. Fam. 7. Labiatae. 



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



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

 valved, circumscissile, or irregularly bursting, not elaatically 

 dehiscent. 

 Placentae axile. 



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



Flowers regular; fertile stamens 5 (4 in Petunia); 

 fruit a berry or capsule. 



Fam. 8. Solanaceae. 

 Flowers more or less irregular ; fertile stamens 2 or 

 4 (5 in Verbascum) ; fruit a capsule. 



Fam. 9. Scrophulariaoeae. 

 Ovary 1-celled; marsh or aquatic herbs with flowers on 

 scapes. Fam. 10. Lentibulariaceae. 



Placentae parietal. 



Herbs, parasitic on the roots of other plants, the leaves 

 reduced to scales, not green; ovary 1-celled. 



Fam. 11. Orobanchaceae. 

 Trees, vines, shrubs, or herbs, the foliage normal. 



Trees, shrubs, or woody vines; capsule 2-eelled; seeds 



winged. Fam. 12. Bignoniaceae. 



Opposite-leaved herbs; capsule 1-celled; seeds wing- 

 less. Fam. 13. Martyniaceae. 



