232 



CONVOLVULACEAE. 



Placentae of the ovary axial. 



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



Corolla-lobes imbricate : capsule not elas- 



tically dehiscent. 

 Corolla-lobes convolute : capsules elas- 



tically dehiscent. 

 Ovary 1-celled. 

 Placentae of the ovary parietal. 



Herbs parasitic on the roots of other plants : 



leaves scale-like : foliage not green. 

 Trees, shrubs or woody vines, or herbs, but 

 not parasitic : leaves not scale-like : foli- 

 age green. 

 Ovary and capsule 2-celled : trees, shrubs 



or woody vines : seeds winged. 

 Ovary and capsule 1-celled: herbs: seeds 

 wingless. 



Fam. 10. RHINANTHACEAE. 



Fam. 11. ACANTHACEAE. 

 Fam. 12. PINGDICULACEAE. 



Fam. 13. OROBAKCHACEAE. 



Fam. 14. BIGNOKIACEAE. 

 Fam. 15. MARTYNIACEAE. 



FAMILY 1. CONVOLVULACEAE. MORNING-GLORY FAMILY. 



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

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

 itary or cymose. Calyx of 5 more or less united sepals, equal or unequal, 

 in one or two series. Corolla superior, convolute in aestivation, its limb 

 often entire. Androecium of 5 stamens, partially adnate to the corolla- 

 tube, alternate with the lobes. Gynoecium free, of two united carpels. 

 Ovary 2-4-celled (rarely 5-celled or 1-celled by the breaking down of the 

 septa). Seeds 1 or 2 in each cavity, often villous. 



Stigmas ovoid or subglobose. 



Stamens and style exserted : corolla salverform. 

 Stamens and style included : corolla funnelform. 



Calyx-lobes coriaceous or membranous, not elongate : ovary 



2- or 4-celled. 



Calyx-lobes herbaceous, elongate, usually pilose : ovary 

 3-celled. 



Stigmas filiform or oblong-cylindric. 



1. QUAMOCLIT. 



2. IPOMOEA. 



3. PHARBITIS. 



4. CONVOLVULUS. 



1. QUAMOCLIT [Tourn.] Moench. Annual (ours) or perennial vines, 

 with twining, glabrous stems. Blades entire, lobed, or divided. Flowers in 

 axillary cymes or solitary. Calyx-lobes equal or nearly so. Corolla scarlet, 

 salverform: tube narrowly funnelform; limb spreading, shorter than the tube. 

 Ovary 2- or falsely 4-celled. Capsules usually 4-celled and 4-seeded. Sum. 

 and fall. 



Leaf-blades pinnately parted, the segments narrow : calyx-lobes obtuse or mucronate. 



1. Q. Quamoclit. 

 Leaf-blades entire : calyx-lobes acuminate. 2. Q. coccinea. 



1. Q. Quamoclit (L.) Britton. Leaf -blades 2-10 cm. long; segments narrowly 

 linear : pedicels clavate : calyx-lobes appressed to the corolla-tube : corolla-tube 

 clavate, 2.5-3 cm. long; lobes ovate or triangular. M. Occasional, in waste 

 places. Nat. of trop. Am. CYPRESS-VINE. 



2. Q. coccinea (L.) Moench. Leaf -blades ovate, 3-10 cm. long, acuminate, 

 angled or entire: peduncles usually stouter than the pedicels: calyx-lobes 

 oblong: corolla scarlet or orange, rarely white; tube 2-4 cm. long; limb cup- 

 like, 1.5-2 cm. broad. S. Bather rare, in fields. Nat. of trop. Am. 



2. IPOMOEA L. Annual or perennial, climbing or trailing vines, or 

 rarely upright plants. Leaf -blades entire, angled, or divided. Flowers solitary 

 on axillary peduncles or in cymes. Calyx-lobes coriaceous or membranous, 

 rarely fleshy. Corolla funnelform, the limb usually spreading. Capsules mostly 

 septifragally 2- or 4-valved. Seeds often pubescent. Sum. and fall. 

 MORNING-GLORY. 



