326 CONVOLVULACE.E. (CONVOLVULUS FAMILY.) 



7. PETUNIA, Juss. 



Calyx 5-parted. Corolla funnel-shaped, plicate. Stamens 5, unequal; 

 anther cells separate. Stigma capitate. Capsule 2-valved, many -seeded. 

 Clammy pubescent herbs. 



1. P. parviflora, Juss. Annual, diffuse, leaves oblong-linear or spatu- 

 late ; corolla small, pale bluish purple. Florida, and westward. Introduced. 



ORDER 92. CONVOLVUL.ACEJE. (CONVOLVULUS FAMILY.) 



Chiefly twining or prostrate herbs, with alternate exstipulate leaves, 

 and regular mostly showy and fugacious flowers. Calyx 5-sepalous, 

 imbricated. Corolla bell-shaped, funnel-shaped, or salver-form, 5- 

 plaited or 5-lobed, convolute in the bud. Stamens 5, inserted on the 

 tube of the corolla : anthers 2-celled, sagittate. Ovary free, single or 

 double, 1-4-celled, with 1-2 erect anatropous ovules in each cell. 

 Styles 1 or 2, entire or 2-cleft. Stigmas capitate, ovate, or acute. 

 Capsule 2 - 6-seeded. Embryo large, coiled or curved in mucilagi- 

 nous albumen. 



Synopsis. 



TRIBE I. CONVOI/VULE^E. Ovary single. Embryo with leafy cotyledons. Cap- 

 sule opening by valves. Flowers axillary, single or cyniose. 



* Style single. Stigmas globose. 



1. IPOMCEA. Capsule 2-celled, the cells 2-seeded. Corolla bell- or funnel-shaped. Sta- 



mens mostly included. 



* * Style single. Stigmas ovate or cylindrical. 



2. JACQUEMONTIA. Capsule 2-celled, 4-seeded. Stigmas ovate, flattened. 



3. CONVOLVULUS. Capsule imperfectly 2-celled, 4-seeded. Stigmas cylindrical. 



* * * Styles 2, separate or partly united. Ovary 2-celled. 



4. EVOLVULUS. Styles separate, 2-parted or 2-cleft. 



5. BREWERIA. Styles separate or partly united, entire. 



TBIBE II. DICHONDRE^S. Ovary double. Embryo with cotyledons. Capsule 

 utricular, 1-seeded. Stems creeping. 



6. DICHONDRA. Corolla bell-shaped. Stigmas thick. Peduncle 1-flowered. 



TRIBE III. CUSCUTE.33. Ovary single. Embryo destitute of cotyledons. Capsule 

 closed. 



7. CUSCUTA. Twining parasites, with scale-like leaves. Styles 2. 



1. IPOMCEA, L. MORNING GLORY. 



Sepals 5. Corolla entire, or 5-angled, or 5-lobed. Stamens dilated at the 

 base. Ovary 2-celled, rarely imperfectly 4-celled. Style simple : stigma 

 canitate, 2-lobed. Capsule 2 -4-celled, 2-4-valved, 4-seeded, or, by abortion, 

 1 -.3-seedeu. Seeds smooth or hairy. Twining or trailing rarely erect 

 herbs, with cordate or sagittate entire or variously lobed leaves, and showy 

 flowers ou axillary peduncles. 





