116 LXXXIV. APOCYNACEE (STAPF). [ Rauwwolfia. 
13037; near Lagos, Rowland! Niger Protectorate: by the Nun River, Barter, 
2091! Nupe, Barter, 1704! Old Calabar, Thomson, 54! 120! Cross River, 
Johnston! Cameroons: Cameroon River, Mann, 750! Preuss, 903! Batanga, 
Bates, 32! Yaunde, 2600 ft., Zenker g Staudt, 118! 784! Zenker, 736! 800! 
1736! Bipinde, Zenker, 842! 850! 16268! 2118! 
Lower Guinea. (aboon: Klaine, 892! Lower Congo: Kisantu, Gillet, 
203 ! 
Mozamb. Dist. German East Africa: Karagwe; Bukoba, Stuhlmann, 980, 
3616, 3621! 
South Central. Congo Free State : Niamniam, by the Assika River, Schwein- 
Surth, 3246! Mobanga, on the Congo, Dewevre, 753. Kiboubou, near Kasongo, 
Dewevre, 924! 
15. R. Volkensii, Stapf. A glabrous shrub, 6 ft. high ; branches 
slender, the older coarsely lenticellate. Leaves in pairs or in whorls of 
3, broadly lanceolate to lanceolate-oblong, 24-3 in. long, 1-1} in. broad, 
acute or subacuminate at both ends, very thin ; secondary nerves about 
7 on each side, faint, but distinct. Flowers pedicelled, in more or 
less umbelliform 3-5-flowered glabrous peduncled terminal cymes; 
peduncles up to 1 in. long; pedicels 2-5 lin. long. Calyx-segments 
lanceolate-subulate, 1 lin. long. Corolla greenish; tube } in. long; 
widened below the middle, hairy within except at the base, mouth not 
villous ; lobes elliptic, very obtuse, 4-5 lin. long, elegantly veined. 
Anthers inserted 2 lin. above the base, #-1 lin. long. Carpels connate 
beyond the middle; style 14 lin. long. Fruit obcordate when young.— 
Tabernemontana Volkensii, K. Schum. in Engl. Pfl. Ost-Afr. C. 316. 
Mozamb. Dist. German East Africa: Usambara; Mlalo, Holst, 174; 
Kilimanjaro ; Shira, Volkens, 1942! 
Imperfectly known species. 
16. R. dichotoma, K. Schum. in Engl. & Prantl, Pflanzenfam- 
iv. ii. 154. 
Lower Guinea. Island of St. Thomas, Voller, 145! 
I have seen only tragments of this plant, the description of which is quite un- 
sufficient. It has opposite leaves with petioles over 1 in. long, and small terminal 
panicles with linear bracts. The winute, crowded buds are coated with a kind of 
varnish. It is very doubtful whether this is a Rawvolfia. 
17. R. longeacuminata, De Wild. & Durand in Comptes-rendus 
Soc. Bot. Belg. xxxviii. 205. Glabrous; branches terete, lenticellate- 
Leaves whorled, petioled, long elliptic-lanceolate, very long acutely acum! 
nate, long cuneate at the base, 34-4 in. long, 54-13 lin. broad, drying 
blackish ; secondary nerves about 11 on each side: veins inconspicuous. 
Flowers in siuail glabrous umbels, ? in. across; peduncle 8—10 lin. long; 
pedicels 3—} lin. long. Calyx } lin. long; segments triangular, acute. 
Corolla-tube 1$—2 lin. long; villous at the mouth ; lobes ? lin. long. 
Lower Guinea. Congo Free State: Cabra. 
The author compares this species with R. obscura, which is also very imperfectly: 
known. 
