Ipomeea. | XC. CONVOLYULACE (BAKER AND RENDLE). 195 
areas well-marked, pulverulent-pubescent. Stamens nearly half the 
length of the corolla.—Schweinf. & Volk. Liste Pl. Somalis, 11, and in 
Ghika, Pays des Somalis, 211; Hallier f. in Ann. Istit. Bot. Roma, 
vii. 236. 
Nile Land. Somaliland: Adda Galla, James & Thrupp! Golis Range, Miss 
Edith Cole! Mrs. Lort Phillips! Wagga Mountain and Bihen, Mrs, Lort 
Phillips ! by the Rivers Jerer, Faf, Salul, and Dajelto, Ghika, Adadle, Keller, 
231; Acadess, Riva, 356; Ogaden, Riva, 938; Haleina, Riva, 1578. 
140. I, argyrophylla, Vatke in Linnea, xliii. 510. An erect 
much-branched shrub, about 1} ft. high; branches slender, clothed 
with silvery tomentum. Leaves crowded, narrowing into a short 
petiole, 14 lin. long; blade narrowly lanceolate, obtuse, entire, up to 
I} in. long, green and glabrous above, densely clothed beneath with 
silvery silky tomentum, as also are the bracteoles and sepals. Peduncles 
short, 1-flowered, silkily tomentose. Bracteoles linear, } in. long. 
Sepals subequal, 7 lin. long, lanceolate, acuminate. Corolla funnel- 
shaped, purple, probably 14 in. long; midpetaline areas of the limb 
with the characteristic silvery hairs. Capsule ovoid, obtuse, glabrou~ ; 
seeds du!l brown, glabrescent.—Engl. Hochgebirgstl. Trop. Afr. 346 ; 
Hallier f. in Sitzungsb. Akad. Wien. Math.-Nat. evii. 51. Rivea 
argyrophylla, Hallier f. in Engl. Jahrb. xviii. 157. 
Nile Land. Somaliland: Serut Mountains, near Maid, 5000-6000 ft., 
Hildebrandt, 1414! 
Near J. cicatricosa, Baker, but distinguished by the narrower leaves. 
Var. glabrescens, Hallier f. in Sitzungsb. Akad. Wien. Math.-Nat. cvii. 51. 
More robust than the species, the adult branches reaching 2 lin, in thickness and 
glabrous, yellowish and shining, rough on drying. Leaves glabrescent below, 
reaching, together with the petiole, 13 in, in length. Calyx 4 in. long. Corolla 
2 in. long ; limb 13 in. wide.—Rivea nana, Hallier f. in Engl. Jahrb, xviii. 157, 
Wile Land. British East Africa: Athi Plains and Machakos, Pospisehil. 
Mozamb. Dist. German East Africa: Masailand, Fischer, 103. 
Var. brevisepala, Rendle. Tough, woody; branches nearly 2 lin. thick, 
glabrous below and inconspicuously pubescent above, studded with the persistevt 
remains of the short leaf-bearing branchlets. Leaves oblanceolate, obtuse, barely 
} in. long, plicate, densely pubescent on the under surface. Flowers solitary, 
axillary, subsessile; bracteoles small, narrow. Sepals lanceolate-acuminate, sub- 
equal, + in. long. Corolla funnel-shaped with a broad tube. Capsule globose, 
blackish, glabrous, about 5 lin. in diam.; seeds dull brown, barely 14 lin. long, sur- 
face minutely areolated. 
Wile Land. British East Africa: Ulu; Lanjora, 5500 ft.; a small shrub, 
growing on rock, Scott-Elliot, 6377a! 
Resembles the species in habit, but is distinguished by its smaller leaves and 
much shorter sepals. 
ii. ¥. adenioides, Schinz in Verhandl. Bot. Ver. Brandenb. xxx. 
270. An erect shrub or undershrub, 1-5 ft. high; the young branches 
and under-surface of the young leaves clothed with short white silky hairs. 
Leaves suborbicular or obovate with cuneate base, entire, 1-2 in. long, 
subobtuse, glabrescent above, silky beneath, especially when young ; 
