962 CONVOLVULACEAE 



Leaf-blades cordate at the base, of an ovate type. 



Sepals pubescent : seeds with long wool all over. 3. I. Jalapa. 



Sepals glabrous : seeds with long wool on the angles. 4. /. pandurata. 



Leaf-blades acute or truncate at the base, of a lanceolate type. 5. /. lonyifolia. 



Leaf-blades sagittate : inner sepals less than 1 cm. long. 6. I. speciosa. 



Sepals acute or acuminate. 



Perennial : calyx glabrous. 7. /. triftda. 



Annual : calyx pubescent, at least sepals ciliate. 



Corolla 3 cm. long or longer. 8. /. Caroliniana. 



Corolla less than 3 cm. long. 



Peduncles shorter than the petioles : corolla-tube white. 9. J. lacunosa. 



Peduncles longer than the petioles : corolla-tube purple. 10. /. triloba. 



b. Leaf-blades palmately 7-parted. 



Terminal leaf-segment entire : sepals becoming 2.5-3 cm. long, longer 



than the capsule. 11. /. cairica. 



Terminal leaf-segment pinnatifid : sepals becoming 4-8 mm. long, shorter 



than the capsule. 12. /. dissecta. 



B. Stems erect or diffusely spreading, sometimes shrubby. 



Annual plants : leaf-blades pedately parted : corolla less than 2 cm. long. 13. I. costettata. 



Perennial plants : leaf-blades entire : corolla fully 4 cm. long. 



Leaf-blades ovate : corolla puberulent without : seeds shaggy-pubescent. 14. L flstulosa. 

 Leaf-blades linear : corolla glabrous without : seeds finely pubescent. 15. I. leptophylla. 



1. Ipomoea littoralis (L. ) Boiss. Perennial, glabrous, fleshy. Stems prostrate, 

 creeping, several m. long, branching : leaf-blades 2-5 cm. long, the early ones ovate to ob- 

 long, the later fiddle-shaped or more deeply lobed, more or less deeply notched at the apex, 

 mostly truncate or cordate at the base : sepals glabrous, oblong or oval, 1-1.5 cm. long, 

 mucronate or acuminate : corolla white, with a yellow throat ; tube funnelforra ; limb 4-7 

 cm. broad : capsules subglobose, 1.5 cm. in diameter : seeds woolly. [ Convolvulus littoralis 

 L. Ipomoea acetosaefolia K. & S.] 



On sandy beaches, South Carolina to Florida and Texas. 



2. Ipomoea Pes-Caprae ( L. ) Sweet. Perennial, glabrous, succulent. Stems pros- 

 trate, creeping, several m. long, branching : leaf-blades suborbicular, 6-10 cm. broad, 

 usually notched at the apex, rounded or cordate at the base ; petioles as long as the blades 

 or shorter : peduncle stout, 1-several-flowered : pedicels more slender than the peduncles : 

 sepals glabrous, oval or suborbicular, about 1 cm. long, obtuse : corolla purple, 4-5 cm. 

 long ; tube broadly funnelform ; limb undulately-lobed, 5-8 cm. broad : capsules broadly 

 ovoid or globose-ovoid, 1.5 cm. high : seeds pubescent. 



On sandy beaches, Georgia and Florida to Texas. In all tropics. 



3. Ipomoea Jalapa (L. ) Pursh. Perennial, finely pubescent. Stems trailing or 

 twining, several m. long, branching : leaf-blades broad-ovate, 6-15 cm. long, acuminate, 

 erose-crenulate, truncate or subcordate at the base ; petioles nearly as long as the blades or 

 shorter : peduncles longer than the petioles : sepals minutely pubescent, oblong or oblong- 

 lanceolate, 1.5-2 cm. long: corolla white or pink-purple ; tube 5-8 cm. long, funnelform ; 

 limb 5-10 cm. broad : capsules ovoid, 1.5 cm. long: seeds with long silky-villous wool. 



In sandy soil, on or near the coast, South Carolina to Florida. Also in tropical America. 



4. Ipomoea pandurata L. Perennial by a huge root, the foliage glabrous or glabrate, 

 deep green. Stems trailing or twining, 1-4 m. long, commonly branched : leaf-blades 

 ovate, often fiddle-shaped, 3-10 cm. long, acuminate, acute or obtuse, undulate, cordate, 

 on slender petioles which are as long as or as long as the blades : peduncles solitary or 2 

 together, 5-10 cm. long, 1-5-flowered ; pedicels subtended by ovate bracts : sepals ovate or 

 oblong, 12-18 mm. long, more or less colored, obtuse, slightly mucronate, imbricated, 

 erect and forming a tube : corolla white or pinkish, 7-10 cm. broad, its tube swollen about 

 the middle, lavender within, its spreading limb with 5 shallow lobes, each lobe impressed 

 with a linear-lanceolate rib which ends in abroad inucro ; filaments shorter than and adnate 

 to the corolla-tube for about 1 cm. from the base, villous at the junction : anthers 6-7 mm. 

 long. 



In dry soil, Ontario to Michigan, Connecticut, Florida and Texas. 



5. Ipomoea longif olia Benth. Perennial, the foliage glabrous or nearly so. Stems 

 trailing, several dm. long, much branched : leaves alternate ; blades lanceolate or oblong- 

 lanceolate, 3-7 cm. long, mucronate, entire, acute or truncate at the base, slender-petioled : 

 peduncles 1-3 cm. long, simple or branched : pedicels usually shorter than the peduncle : 

 sepals ovate or oblong-ovate, 10-12 mm. long, rounded at the apex and sometimes mucren- 

 ulate, the inner somewhat longer than the outer : corolla 5-7.5 cm. long, nearly as broad : 

 filaments densely pubescent at the base. 



On plains and prairies, Oklahoma to Texas and Arizona. Summer. 



6. Ipomoea speciosa Walt. Perennial, glabrous. Stems twining, several m. long, 

 branching, relatively slender : leaf-blades 3-10 cm. long, sagittate or hastate-sagittate, the 



