58 Lxxxiv. APOCYNACE^ (sTAPF). [Landolpkia. 



Mtigua, Stuhlmann, 472 ; Oalle (Wala) River, Stulilmann, 515, and Tabora, Siuhl- 

 mann, 567 ; these specimens probably belong to L. Thollonii. 



26. L. Thollonii, Dev^evre, Caoutch. Aft. Monogr. Landolph. 50. A 

 dwarf shrub, rising scarcely more than J ft. above the ground ; young 

 branches brown, shortly pubescent, finally sometimes glabrescent ; old 

 stems rough from small lenticels. Leaves narrowly oblong to lanceolate, 

 obtusely subacuminate, rounded at the base, 1-2 J in. long, 4-9 lin. 

 broad, scantily pubescent or villous in bud, very soon quite glabrescent 

 (except the midrib) or finally quite glabrous ; midrib sunk above, 

 prominent below; secondary nerves 17-20 on each side, straight, 

 connected close to the margin by flat arches, like the fine reticulation 

 slightly raised above, less so below ; petiole pubescent, 1-2 lin. long. 

 Corymbs small, 4-5-flowered, shortly peduncled, dense, terminal ; 

 peduncle J-4 lin, long ; bracts pubescent ; pedicels 2 lin. long, or hardly 

 any. Calyx 1;^ lin. long; sepals very broad, obovate, rounded or trun- 

 cate, densely fulvo-tomentose, obscurely keeled. Corolla-tube widest 

 between the middle and the mouth, 2-2| lin. long, finely velvety with- 

 out, pubescent within down to the middle ; lobes broadly oblong, over 

 3 lin. long, fulvo-velvety without, margins wavy. Stamens inserted in 

 the upper \ of the tube ; anthers apiculate, | lin. long. Ovary ovoid, 

 villous, chiefly above. Fruit globose, over 1 in. in diam. ; seeds sub- 

 globose, 3 Hn. in diam. — Warb. Kautschukpfl. 120. L. owariensis, 

 var. parvifolia^ Hallier f. Kautschuklianen in Jahrb. Hambujg. 

 Wissensch. Anstalt. xiv. (1899), 3. Beih. 41, 74, partly. 



ZiO^rer Guinea. Frencli Congo : Brazzaville, Brazza Sf Thollon, 145 ! Lower 

 Congo: Kisantu, Gillet,69l Tiimj)&, Zaure7it ! Angola: Kuango River, Mechow, 

 510! 



This is one of the plants yielding " root i ubber." A very similar but evidently 

 distinct plant has recently been distributed as Carpodinus chylorrhiza, K. Schum. 

 MS. It was collected by Baum (714) in Angola, above Sakkemecho on the River 

 Quiriri. The leaves are on the whole longer and narrower and the midrib is much 

 broader, and flatter below. There are no floweis with the specimens. The fruit is 

 globose or pyrifonn, 1 in. in diam. 



Imperfectly known species. 



27. L. Foreti, Jumelle in Cornpt.-rend. Acad. Sc. Paris, cxxiv. 

 (1897) 1539-1541. A quite glabrous climber by means of hook- 

 branched pseudo-axillary tendrils ; young branches reddish-brown, 

 covered with yellowish lenticels. Leaves ovate, long acuminate, rounded 

 at the base, very large, 14 in. long, 8 in. broad ; secondary nerves 12-14 

 on each side, slightly oblique, connected by submarginal arches, promi- 

 nent below ; petiole 7 J lin. long. Cymes dense ; flowers small, white, 

 inodorous. Fruit globose, up to 6 in. in diam. ; seeds about 60. — 

 Pierre in Bull. Soc. Linn. Paris, 1898, 14; Jumelle, PI. a caoutch. et 

 k gutta, 45, figs. 5 and 6 ; Mikosch in Wiesner, Rohstofie, ed. 2, i. 362 ; 

 Hallier f. Kautschuklianen in Jahrb. Hamburg. Wissensch. Anstalt, 

 xvu. (1899), 3. Beih. 79; Warb. Kautschukpfl. 119. 



