J)istichocalyx.\ xcviii. acanthace.k (clarke). CI 



1 . D. angustifolius, C. B. Clarke. Nearly glabrous. Leaves up to 

 5| by 1 in., tapering at both ends, main nerves J in. apart ; petiole 

 ^-1 in. long. Flowers r>-l(>, in a close head; bract J in. long, elliptic, 

 oblong. Calyx J in. long, nearly glabrous ; teeth of ::* posticous lobes 

 triangular, acute, less than Jj in. long. Corolla 1 J in. long, purple when 

 dry; upper half of tube l-l in. in diam. 



Iiower Guinea, (niboon ; Sierra del Crystal, Mann, 1668 ! Mfoa, Bates, 5.S1 ! 



In the note to l)istichoc(dyx (in Benth. & Hook. f. Gen. PI. ii. 1081), Benthnm 

 observes that his D. tJmnhergujiorus has the 3 posticous calyx-segments sometimes, 

 not always, connate. Th6 true D. t]ivvher(iiiJioru^ has the 5 calyx-segments free to tlie 

 base, the present plant (mixed formerly with Jj. tlivnbergiijlorus) is the gromid for the 

 above note. But Bentham subsequently noted on G. Mann's, 1668, " I think different 

 from thunhergiiflorus " — he forgot (or it was too late) to correct the remark in Gen. PI. 



2. D. polyneurus, C. B. Clarke. Very sparingly hairy. Leaves 

 up to 5 J by 1| in., acute at both ends; main nerves J-^ in. apart, 

 beneath very prominent ; petiole |-| in. long, hirsute. Flowers 

 5-10 in an ovoid head ; bract J in. long, elliptic. Calyx | in. long 

 or more ; teeth of 3 posticous lobes triangular, acute, J in. long. 

 Corolla 2 in. long, purple when dry ; upper half of tube J- J in. 

 in diam. 



]Lo'wer Guinea. Gaboon : Sierra del Crystal, Mann, 1667 ! 



3. D. hirsutuSy C. B. Clarke. Stem 2 ft. high, shaggy with brown 

 hair. Leaves up to 4| 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. 



Iiower Guinea. Spanish Gaboon : Mount John, River Kongui, Mann, 1874 ! 

 Gaboon : Mfoa, Bates, 521 1 



The brown shaggy hairs sometimes on the petioles of D. ^iolyneurus suggest the 

 possibility that the present species may be a variety of it. The close, pnrallel, very 

 strong, main nerves of the leaves in Z>. polyneurus are, however, not seen here. 



4. D. grandifolius, C. ^. C/ar^e. Nearly glabrous. Leaves up to 

 7 by 4J in. ; petiole 1 in. long. Spike 3 by 1 in., strobilate ; bracts J by 

 J in., purple (Bates). Calyx f in. long, nearly glabrous ; 3 posticous 

 segments united for | their length. Corolla 1| in. long, blueish purple 

 (dried). 



Iiower Guinea* Gaboon : Mfoa, Bates, 511 ! 



5. D. strobilinuSy C. B. Clarke. Nearly glabrous. Leaves up to 

 7 by 3J in., shortly acuminate at either end ; petiole 1 in. long. Flowers 

 up to 15 in a continuous spike 1% by J in. ; bracts | in. long, broadly 

 elliptic, covering the calyx; bracteoles \ in. long, oblong. Calyx ^ in. 

 long, or rather more ; teeth of 3 posticous segments triangular, jV-yV "^• 

 long. Corolla 1 in. long, white {Mann, Bates), upper part of tube 

 widening, hardly 1 in. in diam. Capsule \ by y\- in. 



I.ower Guinea. Gaboon : Sierra del Crystal, Mann, 1673 ! Mfoa, Bates, 507 ! 



(). D. capitellatusy C. B. Clarke. Very sparsely hairy; stem 1 ft. 

 high. Leaves up to 4 by 1 J in., acuminate at both ends, very thin iu 



