Distichocaly-x. | XCVIII, ACANTHACE® (CLARKE). 61 
1. D. angustifolius, (. B. Clarke. Nearly glabrous. Leaves up to 
5$ by 1 in., tapering at both ends, main nerves } in. apart; petiole 
$-lin. long. Flowers 5-10, in a close head; bract ? in. long, elliptic, 
oblong. Calyx ? in. long, nearly glabrous; teeth of 3 posticous lobes 
triangular, acute, less than } in. long. Corolla 14 in. long, purple when 
dry ; upper half of tube 4-3 in. in diam. 
Lower Guinea. Gaboon : Sierra del Crystal, Mann, 1668! Mfoa, Bates, 534! 
In the note to Distichocalyx (in Benth. & Hook. f. Gen. Pl. ii. 1081), Bentham 
observes that his D. thunbergiiflorus has the 3 posticous calyx-segments sometimes, 
not always, connate. The true D. thunbergiiflorus has the 5 calyx-segments free to the 
base, the present plant (mixed former! y with D. thunbergiiflorus) is the ground for the 
above note. But Bentham subsequently noted on G. Mann’s, 1668, “I think different 
from thunbergiiflorus””—he forgot (or it was too late) to correct the remark in Gen. Pl. 
2. D. polyneurus, (. B. Clarke. Very sparingly hairy. Leaves 
up to 53 by 12 in., acute at both ends; main nerves 4-} in. apart, 
beneath very prominent ; petiole 4-$ in. long, hirsute. Flowers 
5-10 in an ovoid head ; bract 3 in. long, elliptic. Calyx } in. long 
or more; teeth of 3 posticous lobes triangular, acute, $ in. long. 
orella 2 in. long, purple when dry; upper half of tube }-} in. 
in m. 
Lower Guinea. (iaboon: Sierra del Crystal, Mann, 1667 ! 
8. D. hirsutus, C. B. Clarke. Stem 2 ft. high, shaggy with brown 
ur, Leaves up to 41 by 2 in., shortly acuminate at both ends, shaggy 
With brown hairs obscuring cystoliths on both surfaces; main nerves 
in. apart, not conspicuous beneath. Bracts and calyx shaggy with 
brown hairs, Corolla light purple (Bates) ; otherwise as D. polyneuros. 
Lower Guinea. Spanish Gaboon: Mount John, River Kongui, Mann, 1874! 
boon: Mfoa, Bates, 521! 
mane brown shaggy hairs sometimes on the petioles of D. polyneurus suggest the 
ility that the present species may be a variety of it. The close, parallel, very 
“ong, Main nerves of the leaves in D. polyneurus are, however, not seen here. 
4. D. grandifolius, (. B. Clarke. Nearly glabrous. Leaves up to 
7 by 4} in, ; petiole 1 in. long. Spike 3 by 1 in., strobilate ; bracts ¥ by 
1. purple (Bates). Calyx 3 in. long, nearly glabrous; 3 posticous 
(aried), united for } their length. Corolla 13 in. long, blueish purple 
1€q). 
Lower Guinea, Gaboon: Mfoa, Bates, 511! 
5. D. Strobilinus, (. B. Clarke. Nearly glabrous. Leaves up to 
7 by 3} in., shortly acuminate at either end ; petiole 1 in. long. Flowers 
Up to 15 in a continuous spike 1} by 4 in.; bracts % in. long, broadly 
elliptic, covering the calyx; bracteoles } in. long, oblong. Calyx 4 a 
ong, or rather more; teeth of 3 posticous segments triangular, Ys~10 10. 
ong. Corolla 1 in, long, white (Mann, Bates), upper part of tube 
widening, hardly } in. in diam. Capsule } by +’ in. 
Lower Guinea, aboon : Sierra del Crystal, Mann, 1673! Mfoa, Bates, 507! 
_ 6. D. capitellatus, (. B. Clarke. Very sparsely hairy ; stem 1 ft. 
high. Leaves up to 4 by 1} in., acuminate at both ends, very thin 1u 
