SOLANACE.E — CONVOLVULACE^E 



411 



ez. 



7. NICOTlANA. Tobacco. 



Tall herbs, with large usually pubescent leaves: 

 corolla funnelform or salverform, the tube usually long: 

 stigma not lobed: pod 2-4-valved, not very large, s^> 

 contained within the persistent calyx. 



N. Tabacum, Linn. Tobacco. Robust annual, 4-6 

 ft., with very large ovate decurrent entire leaves and 

 rose-purple panicled flowers. Tropical America. 



N. aluta, Link & Otto (N. affini* of gardens). Fig. 

 550. Slender but tall (2-4 ft.) plant with clammy- 

 pubescent herbage: leaves lanceolate or obovate, 

 entire: flowers white, with very slender tube 5-6 

 in. long, the limb unequal. Brazil; common in 

 gardens. 



550. Nicotiana alata. 



XXXVII. CONVOLVULACE.E. Convolvulus Family 



Herbs, mostly twining, with alternate chiefly simple leaves: flow- 

 ers regular, 5-merous, the tubular or trumpet-shaped corolla mostly 

 twisted in the bud, the stamens 5 and borne on the corolla; ovary 

 commonly 1-, mostly 2-loculed, with 2 ovules in each locule, becom- 

 ing a globular capsule in fruit (which is sometimes 4-loculed by the 

 insertion of a false partition). The family contains between 30 and 

 40 genera, and nearly 1,000 species. Common convolvulaceous plants 

 are morning-glory, cypress vine, sweet potato, bindweed, dodder. 



A. Plants with normal foliage. 



B. Stigma 2-3-lobed, knobbed: calyx not bracted 1. Ipomoea 



bb. Stigmas 2, thread-form: calyx sometimes inclosed by 2 



leafy bracts '. 2. Convolvulus 



aa. Plants leafless, parasitic 3. Cuscuta 



1. IPO M <E A. Morning-glory. 



Mostly twining, with showy flowers on axillary peduncles: 

 corolla with a long tube and a flaring limb; pistil 1, with one 

 style, and the stigma 2-3-lobed: fruit a capsule, with 1-seeded 

 locules. 



a. Leaves compound, with thread-like divisions. 

 I. Quamoclit, Linn. Cypress vine. Fig. 551. Leaves pin- 

 nate: flowers solitary, red, small, narrow-limbed, with pro- 

 jecting style and stamens. Tropical America, but run wild 

 South; also cultivated. Annual. 



aa. Leaves simple or deeply lobed, broad. 

 551. Ipomcea '« Bdna-N6x, Linn. White moon/lower. Fig. 552. Tall: 



Quamoclit. leaves heart-shaped, or angled or lobed: flowers 1 to few, 



