SOLANACE^ — CONVOLVULACE^ 



379 



p. violJlcea, Lindl. Fig. 490. Weaker and more diffuse: corolla purple 

 or rose, the tube short and broad: leaves ovate or oval, nearly or quite 

 sessile. The garden petunias are mostly hybrids of the two species. 



6. DAT&RA. Jamestown-weed or Jimson-weed. 



Very strong bushy herbs, with large, long-tubu- 

 lar, short-lived flowers from the forks of the 

 branches: stigma 2-parted: fruit a globular usually 

 prickly capsxile, opening by 4 valves. 



D. Stramdnium, Linn. Fig. 248. Annual, 3-5 

 ft., the stem green: leaves ovate, sinuate or angled: 

 corolla white. Tropics; com- 

 mon weed. 



D. Tdtula, Linn. Stem 

 and corolla purple. 



7. NICOTIANA. 



Tobacco. 



Tall herbs, with large 



"^'--^'^-^^s^ usually pubescent leaves: 



490. Petunia. 



Very near the original 



P. violaeea. 



corolla funnelform or salverform, the tube usually 

 long: stigma not lobed: pod 2-4-valved, not very 

 large, contained within the persistent calyx. 



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

 ft., with very large ovate decurrent entire leaves and 

 rose-purple panicled flowers. Trop. Amer. 



N. al^ta, Link & Otto (^V. affinis of gardens). 

 Fig. 491. 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. 



491. Nieotiaua alata. 



XXXVII. CONVOLVULACE^. Convolvulus Family. 



Herbs, mostly twining, with alternate chiefly simple leaves: 

 flowers 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 locale, 

 becoming 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. Ipomaea 



BB. Stigmas 2, thread-form: calyx sometimes enclosed by 2 



leafy bracts 2. Coitroh'i<h<s 



AA. Plants leafless, parasitic 3. Cuscuta 



