40 LXXXIV. APOCYNACE (STAPF). | Landolphia. 
Rohstoffe, ed. 2, i. 362 ; Schlechter, Westar. Kautschuk-Exped. 229 (?). I. como- 
rensis, var. florida, K. Schum. in Engl. Veget, Uluguru Geb. in Sitz, Ber, Akad, 
Wissensch. Berlin, xvi. (1900) 195 and in Engl. Jahrb, xxviii. 453 (not elsewhere) 
ex Hallier f. Vakea comorensis. Boj. Hort. Maur. (1837) 207 ; DC. Prod. viii. 328, 
and in Nova Acta Acad. Nat. Cur. xxii. ii. (1850), t. 41, figs. 4-7; Collins, Caoutch. 
Rep. 26; F. v. Muell. in Wittstein, Org. Constit. Plants, 258, 268 ; L. Planch. Prod. 
Apocyn. 321. Willughbeia cordata, Klotzsch in Peters, Reis Mossamb. Bot. 
283. 
Upper Guinea. Cameroons: Victoria, Deistel, 130! 
Wile Land. Uganda: Madi, Speke & Grant, 707! British East Africa : Witu, 
Thomas, 5! Massa, by the Tana River, Thomas, 5 partly ! 
South Central, Conzo Free State: La Romée falls, Duchesne, 3! Bonga, at 
the junction of the Sanga und the Congo, Schlechter, 12679! Lukolela, Dewéore, 
830a! Coquilhatville, Dewevre, 584! 
Mozamb. Dist. Zanzibar : Ngezi Forest, Lyne, 106! German East Africa: 
Zanguebar, Kirk! Umba Valley, Smith ! Ukami; Mkulassi, 450 ft., StuAlmann, 
8664! Uluguru; Lussegwa, 1200 ft., Stuhlmann, 8721! Kidai Hills, 1800 ft., 
Stuhlmann, 9001! Portuguese East Africa: Mozambiqne ; Lion’s Creek, 1000 ft., 
Sehlechter,12191! British Central Africa: Nyasaland ; Shire Highlands, Buchanan, 
43! and without particular locality, Buchanan, 220 partly! and 228 partly (ex 
Hallier f.). 
The variety Z. leiantha is also found in the Comoro Islands and Madagascar, 
where the typical form has not yet been observed, 
Opinions as to the economic value of JZ florida are highly contradictory. 
Schlechter, the latest authority on the question, says that the plants with which he 
experimented on the Congo did not yield any rubber at all; he enumerates, however, 
the Landolphia comorensis, K. Schum., from East Africa as one of the most pro- 
dnctive rubber plants of Africa, and suggests that the plant (known under the same 
name) which does not yield rubber may be a distinct species. So far as morpholo- 
gical characters go, there sees to be no difference between the East- and the West- 
African ZL. florida as represented in the herbaria at Kew, London, Berlin and 
Brussels, except that the only fruits of the var. Jeiantha, which I have seen 
(Buchanan, 43), are only 2-23 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, K. Schum. ex Hallier f. Kautschuklianen in Jahrb. 
Hamburg. Wissensch. Anstalt. xvii. (1899), 3. Beth. 86,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 ; midriband 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 
