350 xcn. scrophulariace^e (hemsley and skan). \_Ilysanthes. 



12. I. Schweinfurthii, Engl, in Engl. Jahrb. xxiii. 504. A 

 slender caespitose glabrous or sparingly pubescent herb, 4-8 in. high ; 

 stems erect, simple or branched at the base, quadrangular. Leaves 

 linear, 2A-5 lin. long (the uppermost smaller), rather thick and obtuse, 

 entire. Flowers in a loose raceme ; bracts ^-1^ lin. long, unequal in 

 the same pair ; pedicels 2-6 lin. long, deflexed in fruit. Calyx If lin. 

 lono- 5-ribbed, pale green on the ribs and transparent between ; teeth 

 i lin. long, lanceolate, acute, sparingly ciliate. Corolla about 4| lin. 

 long, lilac ; tube only about J lin. broad ; upper lip deeply bifid, with 

 narrow lobes f lin. long. Staminodes oblong. Capsule fusiform, 

 acute, 2| lin. long. 



Iff ile land. Niamniam : Gutnango Hill, ScJiweinfurth, 3889 ! 3931 ! by the 

 Ibba Kiver, near Nganye, Schweinfurth, 3991 ! 



Var. linearifolia, Engl, in Engl. Jahrb. xxiii. 504. — Leaves narrowly linear, acute . 

 Calyx-teeth narrowly triangular, very acute. 



Upper Guinea. Sierra Leone, Afzelins. 



I have not seen Afzelius' plant. It should be compared with I. Barteri. 



13. I. Barteri, Skan. Very closely resembles /. Schweinfurthii, 

 En<d., but the pedicels are usually scarcely 1 lin. long ; calyx-teeth 

 acuminate; corolla 2-2J lin. long; upper lip bifid, with the teeth 

 broad and only about i lin. long ; staminodes short and ligulate, 

 tapering somewhat at the apex ; capsule lj lin. long. 



Upper Guinea. Northern Nigeria : Nupe; Jeba, on the River Quorra (Niger), 

 Barter ! 



30. DINTERA, Stapf in Mem. Herb. Boiss. xx. 27. 



Flowers cleistogamous. Calyx deeply 5- (rarely 6-) fid ; segments 

 oblong, obtuse. Corolla about as long as the calyx, ellipsoid ; tube 

 sprinkled with sessile glands inside on the anticous part, closed 

 by minute lips ; upper lip outside, shortly 2-lobed ; lower lip 3-lobed. 

 Stamens 2, anticous ; filaments very short, glabrous, inserted above the 

 middle of the corolla-tube ; anther-cells unequal, " indehiscent or 

 imperfectly indehiscent " ; connective between the cells distinct ; stami- 

 nodes none. Ovary ellipsoid-globose, 1 -celled ; style very short ; stigma 

 somewhat thickened ; placentas parietal, bifurcate, shield-shaped ; 

 ovules many. Capsule orbicular-obovate, somewhat compressed on 

 one side, septicidal at the apex or bursting irregularly. Seeds many, 

 minute, oblong, more or less compressed, foveolate.— A dwarf sub- 

 cfespitose quite glabrous aquatic submerged herb ; stein broadly 4- 

 winged. Leaves opposite, sessile, ovate. Flowers axillary, solitary, 

 sessile, minute, ebracteate. 



An endemic monotypic genus allied to Bythophyton, Hook. f. 



1. D. pterocaulis, Stapf in Mem. Herb. Boiss. xx. 29, t. 1 fig. A. 

 Herb about 4 in. high; stems branched chiefly near the base, 

 4-winged ; wings thin, more than \ lin. broad ; internodes up to 5 lin. 



