Ili/santhes.] xcn. scrophulariace.e (hemsley and skan). 345 



20. ILYSANTHES, Rafin. ; Benth. et Hook. f. Gen. PI. ii. 955. 



Calyx 5-partite or 5 -toothed ; segments or teeth narrow, scarcely 

 imbricate. Corolla-tube cylindric or somewhat enlarged above ; upper 

 lip outside, erect, broad, concave, usually shortly bifid ; lower lip larger, 

 spreading ; lobes 3, broad, subequal. Stamens 2, posticous, affixed to 

 the corolla-tube, subincluded ; filaments filiform ; anthers subcoherent, 

 cells divaricate ; staminodes 2, anticous, 2-lobed (one lobe glandular, 

 obtuse, the other slender, acute, sometimes minute, sometimes elongated, 

 rarely bearing an empty anther) or entire, linear or clavate, obtuse, 

 glandular. Style shortly bilamellate at the apex. Ovules numerous 

 in each cell. Capsule ovate, oblong to linear, septicidal ; valves slender, 

 entire. Seeds numerous, foveolate-rugcse. — Herbs, usually annua), 

 slender, creeping or erect, branched, glabrous or more rarely pubescent, 

 often growing in marshy places. Leaves opposite, entire or toothed. 

 Flowers small, axillary and solitary, or in terminal racemes ; peduncles 

 or pedicels ebracteolate, often deflexed in fruit. — Bonnaya, Link et 

 Otto, Ic. PI. Sel. 25, t. 11 ; Benth. et Hook. f. Gen. PI. ii. 956. 

 Species about 35, in nearly all warm countries, chiefly in Africa and Asia. 

 I. reptans, Urb., is not African. De Wildeman (Notices PL Utiles du Congo, 

 5-i9) refers to a plant by this name which is used in the Congo Free State as 

 forage for oxen. 



Calyx deeply 5-cleft. 



Terrestrial plants ; steins leafy ; corolla 2-3^ I'm. 

 ^ long. 



Stems creeping ; leaves about as broad as long . 1. T. rotundifolia. 

 Stems erect ; leaves longer than broad . . 2. I. parvijlora. 



Aquatic plant ; stems naked except near the apex ; 



corolla about 6 lin. long . . . . . 3. I. conferta. 



Calyx 5 -toothed. 



Leaves radical . . . . . . . 4. I. Welwitschii. 



Leaves cauline. 



Leaves spathulate, ovate or elliptic-oblong. 



Peduncles ^-1 lin. long . . . . 5. I, nana. 



Peduncles 3-9 lin. long . ... 6. I. pulchella. 



Leaves linear-lanceolate or linear-oblong. 



Corolla-tube distinctly longer than the calyx; 



calyx-teeth acute or rather narrow at the 



apex. 



Plant only 1-2 in. high ; stems simple or 



sparingly branched ; calyx-teeth narrow 



at the apex but not acute ; upper lip of 



corolla emarginate. 



Stems creeping at the base ; leaves 3-6 lin. 



long; calyx l£-l£ lin. long; corolla 



3-4 lin. long 1.1. pusilla. 



Stems erect; leaves 1|— 2 lin. long; calyx 



scarcely 1 lin. long; corolla about 



2^- lin. long . . . . 8. I. ugandensis. 



Plant up to 5 in. high ; stems much branched ; 



calyx- teeth acute; upper lip of corolla 



bifid, with acute lobes . . . .9.7. gracilis. 



