Ipomoea.'] xc. convolvulace.e (baker and rendle). 135 



Corolla-tube 4-5 in. long. Filaments e\- 



serfced ....... 133. /. stenosiphon. 



Leaves multipartite ..... 134. /. bullata. 



** Sepals membranous. 



Corolla less than 2 in. long . . . 135. /. pyramidalis. 



Corolla over 3 in. long. 



Outer sepals not shaggy at tbe base . 136. /. Hildebrandlii. 

 Outer sepals shaggy at the base . 137. /. incomta. 



§ 8. Xeeophyta. — Erect low-growing shrubs with slender stiff woody branches 

 and small reniform hairy leaves. Flowers small. Sepals small, coriaceous, bioad, 

 obtuse. Corolla funnel-shaped, 1 in. or less long. 



Only Tropical African species ..... 138. 1. Donaldssoni. 



§ 9. Argytrophyllje. — Erect shrubs; young branches and lower surface of the 

 leaves covered with silvery or white hairs (except /. argyrophylla, var. glabrescens). 

 Leaves entire, lanceolate to ovate, obtuse, short-stalked. Flowers generally solitary 

 on short axillary pedicels ; bracts narrow. Sepals lanceolate, acuminate, silky on 

 the back. Corolla moderate to large. 



Near Section FlorifercB, which they resemble in the silvery or white indumen- 

 tum, and the lanceolate silky sepals, but are distinguished by the leaves having an 

 entire base, and the reduced inflorescence. 



Leaves ovate ........ 139. /. cicatrosa. 



Leaves narrowly lanceolate 140. I. argyrophylla. 



Leaves suborbicular, obovate or oblong-lanceolate . . 141. /. adenoides. 



§ 10. Florifer^:. — Erect or climbing shrubs ; the whole plant or the younger 

 shoots and leaves, especially their lower surfaces, pubescent, tomentose or silky. 

 Leaves entire, reniform to cordate-orbicular, long-stalked. Flowers in many- 

 flowered dichasial cymes, generally large. Bracts resembling the sepals or narrower 

 (minute in /. Hartmanni). Sepals subcoriaceous, generally unequal, lanceolate or 

 linear-lanceolate, acuminate (lanceolate to ovate and acute in /. Hartmanni, spathu- 

 late in /. spathulata), silky, tomentose (/. chrysosperma) or hirsute (/. Hartmanni) 

 on the hack. Corolla generally pallid with a purple tube. Seeds, where known, 

 hairy. 



Bracts about as long as the sepals. 

 Sepals tapering. 



Leaves with cordate base. 



Bracts and sepals silky on the back. 



Indumentum on back of leaves, bracts, and 

 sepals not silvery. Sepals barely exceed- 

 ing 1 lin. in breadth .... 142. /. kituiensis. 



Indumentum silvery. Sepals up to 2^ lin. 



broad ....... 143. 1. nyikensis. 



Bracts and sepals tomentose on the back . . 144. /. chrysosperma. 



Leaves with rounded base ..... 145. I. urbaniana. 



Sepals spatlmlate ....... 146. I. spathulata. 



Bracts minute ........ 147. /. Hartmanni. 



Position doubtful 148. I. Mahoni. 



§ 11. Phyllocalyx. — Herbaceous or suffruticose. Stems climbing or trailing, 

 hairy or glabrous. Leaves ovate-cordate, long-stalked, glabrous. Flowers showy, 

 few to several in the axillary peduncles. Bracts large, t'oliaceous. Sepals large, 

 foliaceous, with well-marked longitudinal veins, ovate, the obtuse apex bearing a 

 short bristle, glabrous, the three outer much larger than the inner. 



Corolla 2f-4 in. long 149. /. setifera. 



Corolla 1%-li in. long 150. I.fimbriosepala. 



