964 CONVOLVULACEAE 



15. Ipomoea leptophylla Torr. Perennial, glabrous. Stems erect or ascending, 

 3-12 dm. tall, the branches spreading or recurving : leaf-blades linear, 5-12 cm. long, 

 acute, entire, short-petioled : peduncles 1-6 cm. long, 1-3-flowered : sepals ovate or orbic- 

 ular-ovate, 5-10 mm. long, the inner much larger and longer than the outer : corolla 

 pink-purple, 5-7 cm. long : capsules ovoid, 1.5-2 cm. long : seeds finely pubescent. 



On plains and prairies, Wyoming to Nebraska, Texas and New Mexico. 



7. PHARBITIS Choisy. 



Annual or perennial climbing or trailing vines. Leaves alternate : blades entire, 

 angled or lobed. Flowers solitary on axillary pedicels, or in cymes. Sepals equal or un- 

 equal, herbaceous, elongated, each with a pubescent base and a narrow tip. Corolla 

 white, blue or purple, funnelform : limb 5-angled or 5-lobed. Stamens 5, included. Fila- 

 ments filiform. Ovary 3 or 5-celled. Styles united, included. Capsules depressed or elon- 

 gated, usually septifragally 3 or 5-valved. Seeds smooth. The plants flower from spring 

 to fall. MORNING-GLORY. 



Calyx bristly pubescent especially near the base. 



Tips of the sepals merely acute or acuminate. 1. P. purpurca. 



Tips of the sepals conspicuous narrow prolongations from the base. 



Leaf-blades entire. 2. P. barbigera. 



Leaf -blades conspicuously lobed. 



Annual : leaf-blades 3-lobed. 3. P. hederacea. 



Perennial : leaf-blades 5-lobed. 4. P. Lindheimeri 



Calyx glabrous or nearly so, not bristly. 5. P. cathartica. 



1. Pharbitis purpurea (L. ) Voigt. Annual, finely pubescent, or hirsute. Stems 

 twining, several m. long, branching : leaf-blades ovate or orbicular-ovate, 6-18 cm. long, 

 entire, short-acuminate, undulate, deeply cordate ; petioles longer than the blades or 

 shorter : peduncles commonly longer than the subtending petioles : sepals hispid near the 

 base, 10-15 mm. long, oblong, oblong-lanceolate or nearly linear, acute or acuminate : 

 corolla 5-6 m. long ; tube pink or white ; limb purple or rarely pink or white, slightly 5- 

 lobed : capsules 10-12 mm. in diameter, apiculate. [Ipomoea purpurea (L. ) Roth.J 



In thickets and waste places, Nova Scotia and Ontario to Nebraska, Florida and Texas. Natural- 

 ized from tropical America. 



2. Pharbitis barbigera (Sims.) G. Don. Annual, hirsute. Stems twining, several 

 m. long, branching : leaf -blades orbicular-ovate, 5-12 cm. long, abruptly acuminate, cil- 

 iate, cordate ; petioles as long as the blades or shorter : peduncles shorter than the subtend- 

 ing petioles : sepals densely hirsute below the middle, 1.5-3 cm. long, with ovate or linear- 

 lanceolate base and linear tips, these ciliate : corolla 3-3.5 cm. long ; tube white or pink ; 

 limb purple or partly so, 3-4 cm. broad : capsules depressed, fully 1 cm. broad, [fpomoea 

 barbigera Sims. ] 



In thickets, Georgia, Alabama and Florida. 



3. Fharbitis hederacea (L. ) Choisy. Annual, pubescent. Stems twining, several 

 m. long, more or less hirsute : leaf-blades 5-12 cm. long, as broad as long or broader, 

 deeply 3-lobed, cordate ; lobes acuminate, more or less constricted at the base ; petioles as 

 long as the blades or shorter : peduncles commonly shorter than the petioles : sepals densely 

 hispid at the base, 2-3 cm. long, the bases ovate or oval, the tips longer, linear or linear- 

 spatulate : corolla deep blue or tube white within and without, 3 cm. long ; limb 3 cm. 

 broad, shallowly 5-lobed and with 5 small mucronations : capsules subglobose, 10-12 mm. 

 in diameter : seeds velvety. [Ipomoea hederacea (L. ) Jacq. /. Ml (L.) Pursh.J 



In dry or sandy soil, New York to South Dakota. Florida and Mexico. 



4. Fharbitis Lindheimeri (A. Gray) Small. Perennial, finely pubescent. Stems 

 more or less twining, more or less branched, retrorsely pubescent : leaf-blades 5-10 cm. 

 in diameter, suborbicular in outline, 5-parted, strigillose ; lobes ovate or ovate-lanceolate, 

 3 interior ones abruptly contracted at the base : peduncles as long as the subtending peti- 

 oles or longer : sepals bristly at the base, linear or linear-lanceolate, 2-3.5 cm. long : 

 corolla light blue, 6-9 cm. long ; limb 6-8 cm. broad : capsules globular, about 1 cm. in 

 diameter. [Ipomoea Lindheimeri A. Gray.] 



In rocky soil, Texas and New Mexico. 



5. Pharbitis cathartica ( Poir. ) Choisy. Perennial, minutely strigillose or glabrate. 

 Stems more or less twining, branching : leaf-blades broadly ovate, 5-9 cm. long, entire or 

 3-lobed, acuminate, cordate : peduncles shorter than the subtending petioles : sepals gla- 

 brate, linear-lanceolate or ovate-lanceolate, 1-2 cm. long, acuminate : corolla pink-purple 

 or crimson ; limb 6-8 cm. broad, undulate : capsules spheroidal, about 1 cm. broad. 

 [Ipomoea cathartica Poir. ] 



In thickets, peninsular Florida. Also from the Bahamas to Brazil. 



