40 Lxxxiv. APOCYNACE^ (stapf). [Landolphia. 



Rohstoife, ed. 2, i. 362 ; Schlechter, Westa^r. Kautscliuk-Exped. 229 (?). L. como- 

 rensis, var. fiorida, K. Sclium. in p]iigl. Veget. Uluguru Geb. in Sitz. Ber. Akad. 

 VVissensch. Berlin, xvi. (1900) 195 and in Engl. Jaiirb. xxviii. 453 (not elsewhere) 

 €x Hallier f. Vahea comorensis. Boj. Hort. Maur. (1837) 207; DC. Prod. viii. 328, 

 and in Nova Acta Acad. N^t. Cnr. xxii. ii. (1850), t. 41,' H^s. 4-7; Collins, Caoutch. 

 Hep. 26; F. v. Muell. in Wittstein, Org. Constit. Plants, 258, 268 ; L. Planch. Prod. 

 Apocyn. 321. Wilhiqhheia cordata, Klotzscli in Peters, Reisj Mossamb. Bot. 

 283. 



Upper Guinea. Catnemons : Victoria, Deistel, 130 ! 



WSle I^and. Uganda : Madi, SpeJce Sf Grant, 707 ! British East Africa : Witu, 

 Thomas, 5 ! Massa, by t'le Tana River, Thomas, 5 partly ! 



South Central. Congo Free State : La Romeo falh, Duchesne, 3 ! Bonga, at 

 the junction ot the Sanga juid the Congo, Schlechter, 12679 ! Lukolela, Deivevre, 

 830a ! Coqnilhatville, Deivevre, 584! 



Mozamb. Dlst. Zanzibar : Ngezi Forest, Lyne, 106 ! German East Africa: 

 Zanguebar, JiTtV^ .' Urn ba Valley, SmiYA .' Ukami; Mkn\a,sii, AbO ft., Stuhlmann^ 

 8664! Uluguru; Lussegwa, 1200 ft., Siuhlmann, 8721! Kidai Hills, 1800 ft., 

 Siuhlmann, 9001 ! Portuguese East Africa : Mozambique ; Lion's Creek, 1000 ft., 

 Schlechter, 12191 ! British Central Africa : Nyasaland ; Shire Highlands, Buchanan, 

 43! and without particular locality, Buchanan^ 220 partly! and 228 partly (ex 

 JTallierf.). 



The variety L. leiantha is also found in the Comoi'o Islands and Madagascar, 

 where the typical form has not yet been observed. 



Opinions as to the economic value of L. fiorida are highly contradictory. 

 Schlechter, the latest autliority on the question, says that the plants with which he 

 experimentel on the Congo did not yield atiy rubber at all; he enumerates however, 

 the Landolphia comorensis^ K. Schum., from East Africa as one of the most pro- 

 ductive rubber plants of Africa, and suggests that the plant (known under the same 

 njime) which does not yield rubber may be a distinct species. So far as morpholo- 

 gical characters go, there see us to be no difference between the East- and the West- 

 African L. fiorida as represented in the herbaria at Kew, London, Berlin and 

 Brussels, except that the only fruits of the var. leiantha, which I have seen 

 {Buchanan, 43), are only 2-2^ in. long and 1-2-seeded, although evidently quite 

 mature. As the size of the fruit and number of seeds in each is known to vary con- 

 siderably in other species, this can hardly be taken as more than an individual or local 

 variation 



8. L. ochracea, /r. Schvm.ex Hallier f.Kautschuklianen in Jahrb. 

 Hamburg. Wissensch. Anstalt. xvii. (] 891)), 8. Beih. 80, t. i. A tall shrub 

 climbing by means of sensitive inflorescences acting as tendrils ; young 

 branches stout, with a very minute dense cinnamon-coloured felt 

 of hairs. Leaves elliptic to elliptic-oblong, abruptly and shortly 

 acuminate, minutely cordate at the base, 8-14 in. long, 4-7 in. broad, 

 coriaceous, glabrous and glossy above, covered with a delicate cinnamon- 

 coloured felt of hairs beneath ; midrib and secondary nerves channelled 

 above, raised below ; secondary nerves 7-10 on each side, oblique, 

 curved, passing into the large marginal arches; transverse veins con- 

 spicuous, remote; petiole stout, | in. long. Corymbs dense, many- 

 flowered, terminal on remote divaricate branches of an elongate 

 peduncled panicle, which is covered in all parts with a tomentum like 

 that of the young branches ; peduncle stout, long ; rhachis over 6 in. 

 long ; branches up to 1 in. long, the upper sensitive like the tips of the 



