154 CXXXIII. ORCHIDEE (ROLFE). [ Listrostachys. 
Lower Guinea. Gaboon: Como River, Bates, 462! and without locality, 
Du Chaillu! Munda Dist.: Sibange Farm, Soyaux, 246! Loango, Micholitz ! 
Much larger than the S. African Z. arcuata, Reichb. f., with which Lindley 
formerly confused it. A fruiting specimen from Sierra Leone, Scott-Elliot ! may 
belong here. 
3. L. acuminata, Rolfe. Leaves oblong, shortly, obtusely and 
unequally bilobed, 5 in. long, 14 in. broad. Raceme several-flowered. 
Bracts broadly ovate, subacute, cucullate, 9-11 lin. long. Pedicels 14 lin. 
long. Sepals and petals lanceolate, acuminate, somewhat undulate, 
11-13 lin. long. Lip lanceolate, acuminate, rather more fleshy than 
the sepals and petals, 10-12 lin. long; margins somewhat incurved 
near the base; dise slightly gibbous in front of the spur; spur a little 
curved, stout below, much narrowed above, 13-2 in. long. Column 
very stout, 1-14 lin. long. 
Lower Guinea. Princes Island, Henriques ! 
4. L. Hookeri, Rolfe. Stems short, 4—5 in. long. Leaves linear- 
oblong, 3—5 in. long, 6—10 lin. broad; apex very shortly bilobed ; lobes 
slightly unequal, rounded. Racemes 24-4 in. long, 4—10-flowered, 
secund. Bracts broadly ovate, subobtuse, 3-5 lin. long. Pedicels 
6-9 lin. long. Sepals lanceolate, acuminate, 6-7 lin. long, recurved. 
Petals similar to but slightly smaller than the sepals. Lip acuminate 
from a broader triangular-ovate base, recurved, nearly as long as the 
petals; spur rather stout, nearly straight, 14-14 in. long. Column 
very stout, 4 lin. long; rostellum linear, 14 lin. long, deflexed into the 
spur ; gland linear, 1} lin. long; stipites distinct, } lin. long.— Angraecum 
arcuatum, Hook. f. in Journ Linn. Soc. vii. 220 (not of Lindl.). 
; Upper Guinea. Cameroon Mountains, 4000-6000 ft, Mann, 2114! Johnston, 
01! 
Near the South African Z. arcuata, Reichb, f., with which it has been confused, 
but with a nearly straight spur and thinner leaves. 
Fine fruiting specimens from near Sulimania, Sierra Leone, Scott-Elliot, 5282! 
and near Sutah, Ashanti, Cummins, 37 ! apparently represent distinct species of this 
affinity, but cannot be identified without flowers. 
5. L. Sedeni, Reichb. f. in Gard. Chron. 1878, ix. 138. Leaves 
broadly ligulate, obliquely tridentate or shortly bilobed, 5—64 in. long, 
3-1 in. broad. Racemes 5 in. long. Bracts ochreate, lanceolate, acute, 
half to one-third as long as the pedicels. Flowers white, with a reddish 
spur. Sepals lanceolate, acuminate. Petals subequal. Lip lanceolate, 
acute, without lateral teeth; spur wide at the mouth, tapering or filiform 
towards the apex, acute, nearly straight, longer than the pedicel. 
Column short; anther abruptly rostrate ; rostellum linear, divided only 
to the middle.— Angraecum Sedeni, L. Lind. & Rodigas in Lindenia, 
iii. 81, t. 135. 
East Africa. Culminated specimen, Seden. 
Near the South African L. arcuata, Reichb. f., but with broader and longer leaves; 
louger and more acute bracts, straight spur, lip without lateral teeth, beaked anther, 
and bifid rostellum, Only known to me from the original description and the figure 
