Landolphia.] lxxxiv. apocynace.'e (stapf). 51 



Upper Guinea. Camerooiis : Yaunde, Zenker, r)38 ! 



Var. y tomentella, Stapf. Young branches and tendrils densely fulvo-tomentose. 

 Leaves oblong to elliptic, obtuse or obtusely subacuminate, 2-3^, in. long, 1-1.] in. 

 broad, quite glabrous above (except on tlie midrib), softly pubescent below when young, 

 soon glabrescent. Fruit globose, 1] in. in dinni., smooth, dotted with numerous 

 lenticels; rind 1 lin. thick. — L. owariennis, forma. Dyer in Kew Report 1880, 38. 

 L. Heudelntii, K. Sebum, in f]ngl. .Tahrb. xv. 407 partly, t, xii. fig. B ; in Engl. PH. 

 Ost-Afr. B, 44G-459 partly; in Engl, and Prantl, PHanzenfam. iv. ii. 130 partly. 

 Hallier f. I.e. 75 partly; Hua & Chevalier, in Journ. de Bot. xv. (1901) 70 (not 

 elsewhere). Carpodinns acidns, Schweinf. Heart of Africa, i. 185, not of Don; 

 C. sp. Schweinfurth, I.e. 19^. 



JTlle I»and. British East Africa : Jur ; Wan, Schtveinfurth, 1GG7 ! Kurshook 

 Ali's Seriba, Schweinfurth, ser. iii- 70 ! Jur Ghattas, Schivcivfurth, 13771 



L. owariensis is one of the principal sources of West African rubber. 



L. Gentilii, De Wild., Apocyn. a latex rec. par Gentil, 20, seems to me identical 

 with L. owariensis. The specimen from which L. Gentilii was described formed 

 part of a sa.mple of " Bongew," the rest of it being admitted by De Wildeman as 

 L. owariensis. According to the author the former differs in having somewhat 

 narrower leaves, a more pubescent corolla-tube (pubescent all over without, except 

 where it is covei'cd by the calyx), longer corolla-lobes (2.} lin. against 1— Ir, lin. in 

 L. owariensis), a slightly different stigma and smaller fruits. As to the fruits, the 

 author himself says that he saw only some very young ones, and Geutil's description 

 of their being ''small" is too vague and may also refer to immature fruits. The 

 other differences seem to lie well within the ordinary limits of variation of L. 

 owariensis. 



20. L. Klainei, Pierre in Bull. Soc. Linn. Paris, 1898, 13, 15. 

 A scandeiit shrub with long branched tendrils (modified inflorescences); 

 young branches more or less pubescent, soon glabrescent, dark reddish- 

 brown, dotted with minute whitish lenticels. Leaves oblong, gradually- 

 tapering to an obtuse or subacute acumen, rounded or shortly subacute 

 at the base, 5-6 in. long, 1 J to more than 2 in. broad, coriaceous, pubes- 

 cent when quite young, soon glabrous, somewhat glossy above ; midrib 

 distinctly sunk above, prominent below; secondary nerves 13-15 on 

 each side, moderately oblique, very slender, connected by strongly curved 

 delicate zig-zag arches rather close to tlie margin, like the delicate net- 

 work of veins slightly raised on both sides ; petiole 2 lin. long, slightly 

 pubescent in the younger leaves. Corymbs dense, subsessile, many- 

 flowered, or panicles elongate, with distant spreading branches passing 

 into tendrils, fulvo-pubescent or finely tomentose all over (including the 

 calyces) ; bracts oblong to ovate, obtuse ; pedicels very short. Calyx 

 slightly over 1 lin. long; sepals broad-oblong or ovate, subacute or 

 very obtuse and apiculate ; midrib often slightly prominent and 

 acute. Corolla-tube cylindric to the middle, then widened and con- 

 stricted again below the mouth, 2J lin. long, very finely pubescent 

 except at the base ; lobes linear, obtuse, slightly shorter than the tube, 

 finely pubescent along the middle without, mouth very narrow and 

 very minutely pubescent. Stamens in the upper third of the tube ; 

 anthers linear-oblong, subacute. Ovary oblong-ovoid, tapering into the 

 style, top very finely pubescent ; style and stigma almost lA lin. long, 

 the latter slender-cylindric, bifid. Fruit very large globose, 0-10 in. in 



