CONVOLVULACEAB 387 



racemes. Sepals ovate to oblong, unequal or subequal. Corolla campanu- 

 late or widely funnel-shapedj plaited. Stamens included. Ovary 4-celled, 

 4-ovuled; style filiform. Fruit subglobose, nearly dry, indehiscent or irreg-. 

 ularly breaking up; seeds 1 to 4, glabrous. 



Species about 25, in most tropical countries, about 4 in the Philippines. 



1. R. CORYMBOSA (L.) Hallier f. (Ipomoea sidaefoKa Choisy). 



A scandent, somewhat woody vine reaching a height of at least 10 m, 

 glabrous throughout. Leaves ovate, entire, acute or acuminate, base deeply 

 cordate, 6 to 10 cm long. Peduncles axillary, solitary, in leafy racemes, 

 each peduncle umbellately about 5-flowered, or the terminal ones racemose. 

 Calyx green, 10 to 12 mm long, the lobes oblong, unequal. Corolla campanu- 

 late, 2.5 cm long, pale-green and white, dark-purplish at the base inside. 

 Capsule ellipsoid, glabrous. 



In thickets, Masambong, fl. Oct.-Nov. A native of tropical America,, 

 introduced here as an ornamental and now naturalized, but at present, 

 known in the Philippines only from the vicinity of Manila. 



9. HEWITTIA Wight & Amott 



Herbaceous, twining, slender, more or less pubescent vines. Leaves 

 ovate, cordate at the base, ang^ilar, entire or obscurely lobed. Peduncles 

 axillary, the flowers solitary, or few and subcapitate. Sepals acute, the 

 outer ones enlarged in fruit. Corolla campanulate, the limb 5-plaited.' 

 Ovary hirsute, 1-celled, 4-ovuled. Capsule globose, 4-valved, 1-celled, usually 

 4-seeded. (Named for — Hewitt.) 



A monotypic genus. 



1. H. SUBLOBATA (L. £.) O. Kuntze. (H. bicolor Wight) ^ 



A slender vine reaching a length of from 2 to 4 m. Leaves 3 to 10 



cm long, acuminate or acute, base cordate. Peduncles longer than the 



petioles. Calyx green. Corolla straw-colored or nearly white, the center 



usually dark-purple or brownish-purple inside, hairy externally, about 2 



cm long, the limb about 2.6 cm in diameter. 



In thickets and open grass lands, occasional, fl. more or less all the 



year; throughout the Philippines, certainly introduced. Widely distributed 



in the tropics. 



10. MERREMIA Dennstaedt 



Herbaceous or shrubby twining vines, sometimes prostrate the stems 

 mostly cylindric. Leaves entire, lobed, or divided. Flowers axillary, sol- 

 itary, or in few- to many-flowered cymes, the bracts small. Sepals 5, 

 rounded or acuminate, subequal. Corolla campanulate, white to yellow, 

 the tube vnth 5 vertical bands each usually marked by 5 pale or violet 

 lines, the limb plicate, margins slightly lobed. Stamens 5,^ unequal; an- 

 thers usually twisted. Ovary 2- or 4-celled; ovules 4. Fruit a 4-valvea 

 capsule, 1- to 4-celled. (In honor of B. Merrem, a German botanist.) 



Species about 60 in all warm countries, 10 in the Philippines. 



1. Corolla quite glabrous outside; leaves glabrous or only slightly pubescent. 

 2. Sepals long-acuminate; corolla with a pale-purple center.. 1. M.hastata 

 2. Sepals obtuse; flowers uniformly yellow. 

 3. Leaves narrow, linear' to oblong, or the lower ones ovate-oblong and 



subcordate 2. M. hirta, 



3, Leaves broadly ovate, deeply cordate. 



