542 



T.XXXViri. ACANTHACEiE. 



errors, prohably clerical, render the distinctions upon which some of his groaps are esta- 

 blished raiher difficult to make out. His arrangement has, however, dispelled much of the 

 obscurity in which that of the * Prodromus ' by Xees had been involved. 



Tribe I. Thunbergieae. — CoroUa-limh with 5 nearly equal spreading lohes^ con- 

 torted in the bud. Seeds globular^ resting on a cup- shaped expansion of the placenta. 



Stem twining. Calyx an entire or toothed ring concealed within 



the bracteoles. Capsule beaked , , . 1. Thunbergia. 



Tribe II. Welsonieae. — Corolla-Jhnl of 5 nearly equal lobes or 2'Hpped, imbricate in 

 the bud, the upper lobes or Up outside. Seeds globular. Retinacida none or reduced to 

 minute papillcB. 



Corolla-lobes nearly equal. Stamens 2 

 Corolla-lobes nearly equal. Stamens 4 



2. Nelsonia. 



3. Ebermatera. 



Tribe III. 'Ryx^Wle^.—Corolla-lobes 5, nearly equal or 2-lipped, contorted in the hud. 



4. Hygkophiea 

 6. Kuellta, 



Seeds fat. Betinacula promi/iC/it. 



Corolla 2-lipped. Stamens 4. Ovules several in each cell . . ". 

 Corolla. lobes nearly equal, spreading. Stamens 4. Ovules 6 or 

 more in each cell .... 



Tribe IV, Jvisticie^.— Corolla 2-lipped or l-lipped by the reduction of the upper one 

 or rarely nearly equally ^-lobed, the lobes variously imbricate but 7iot contorted in the 

 bud. Seeds flat. Retinacula prominent. 



Corolla with one broad flat (lower) lip. Stamens 4. Leaves 



usually prickly-toothed .6. ACANTHUS. 



Corolla 2-lipped. Stamens 2. 



Bracts small or not euclosinsr the flowers. 



or 



Anther-cells attached one higher up than the other. Upper 



corolla hp erect 7. JusTlciA. 



Anther-cells equal and parallel. Upper covdla-lip' incurved" 

 Flowers red . . . 



8. GRAPTO?Hri.LUM 



9. Diclipteba. 



Bracts in 2 pairs, forming an involucre enclosing 1 to 3 flowers. 



Inner involucral bracts broad and appressed. Outer ones 



spreading snbulate or spinous. Anthers 2-celled . . . 



Involucre cyhudrical, the 2 pairs of bracts nearly equal and 



usually connate, one pair within the other. Anthers 1- 



^ _, ^*^"e^J -. . , 10. Hypoestes. 



Corolla-lobes nearly equal, spreading. Stamens 2 ..... 11. EkanthemUM. 



w 



Tribe I. Thunbergie^.— Corolla-limb with 5 nearly equal spreading 

 lobes, contorted in the bud. Seeds nearly globular, resting on a cup-shaped 

 expansion of the placenta. 



* 1. THUNBERGIA, Linn. f. 



Calyx reduced to an entire or many-toothed rin^ and concealed within 3 

 Y^i^ bracteoles. Corolla-lobes 5, nearly equal, spreading, contorted in the 

 bud. Stamens 4, uicluded in the tube • anther-cells parallel. Ovules 2 w 

 each ceH of the ovary Capsule globose and seed-bearing at the base, termi- 

 nating in a flattened beak. Seeds globular, hollowed out on the inner face, 

 and inserted on a cupular (sometimes very small) expansion of the placenta. 



rarely dwarf and prostrate herbs. Flowers in axillary pedicels 

 or in terminal racemes. 



T\vinin2" or 



