8. Lettsomia.] 80. CONVOLVULACE^. [9. Ipomba. 



persistent oblong or "broadly elliptic obtuse £". Hepal* %-\" oblong obtuse 

 outer |" broad, flesby arjd accrescent in fruit. Corolla If" long, white except 

 the short light-purple petals, densely hairy without. Fil. with enlarged 

 woolly base curving over the ovary. Fruit globose orange T y diaru. 

 2-eelled and seeded. 



9. Ipomea, L, 



Prostrate or climbing herbs rarely shrubs, with palmi-nerved 

 or palmately-divided (pinnatisect in I. Quamoclit) leaves 

 usually cordate at base. Fls cymose, or on 1-fld. peduncles. 

 Sepals often unequal. Corolla funnel-shaped or campanulate, 

 scarcely lobed, limb plaited in bud. St. unequal. Ovary 2- 

 celled with 2 ovules in each cell, more rarely 4-celled (3-celled 

 in I. Nil), style slender with 2 globose stigma tic lobes. 

 Capsule valvular or irregularly dehiscent, epicarp and endo- 

 carp often separately dehiscent, dry often papery. 



The following sections are conterminous with the separate genera 

 adopted in Prain's " Bengal Plants " (but withthe addition of Pharbitis), 

 and which are themselves old genera resuscitated. 

 A. Corolla campanulate tubular-carapannlate, or funnel- 

 shaped white, yellow or orange Pollen not spinescent. 



Sec. I. Merremia, Dennst (genus). Vertical hands 

 on corolla usually with 5 purple lines. St. unequal. 

 Anthers included or exserted, usually twisted. 

 Ovary-2 or 4-celled. Capsule 4-valved. 



1. Spaces between bands badly defined. No purple 



fines. Corolla 1-1|". 

 Cymes compact sub-umbellate. Fls. pure white 



or cream 1. cymosa. 



Fls, sub-racemose, yellow, shaggy without . . 2. petaloidea. 



2. Spaces between hands well defined. Lines 



usually present. 



o. Corolla 1£" long. L. palmately lobed. Fls. 



yellow 3. viHfolia, 



b. Corolla £-f '' long. Fls. pale yellow. 

 Prostrate. L. rarely over T'sessile hastate 



oblong . 4. tridentata. 



Twining. L. 1-2'' ovate-cordate. Peduncles £-3'' . 5. chryseides. 

 Creeping. L. £-li 7 reniform or ovate-cordate. 

 Peduncles <H" fi- renifarmis, 



465 



