xcviii. ACANTHACE^ (burkill). \Thunhergia. 



2. THUNBERGIA, Linn. ; Benth. et Hook. f. Gen. PL ii. 1072. 



Calyx with long teeth or truncate. Corolla conspicuous, white, or 

 of various shades of yellow, blue, or purple ; lobes 5, equal or nearly so, 

 contorted. Stamens 4, enclosed in the tube of the corolla, on which 

 near the base they are inserted. Pollen globose, smooth, reticulate or 

 spiny. Disc fleshy, forming a ring round the ovary. Stigma 2-lipped 

 or funnel-shaped, overtopping the anthers. Ovary with 2 collateral 

 ovules in each cell. Capsule with a sterile beak above and a spherical 

 fertile part below, loculicidal. Seeds ovoid or compressed dorsally, 

 smooth or warted ; hilum central ; no retinacula. — Herbs or shrubs, 

 erect or climbing, with flowers usually solitary, each protected by a pair 

 of large bracteoles. — Meyenia^ Nees in Wall. PI. As. Ear. iii. 78. 

 Endomelas, Rafin. -Fl. Tellur. iv. 67. 



A genus of about 75 species, chiefly African, extending into India, and by three 

 specicH represented in Tropical Australia; in America as introduced plants. The 

 genus readily falls into three sections, two of which are found in Tropical Africa. 



*EuTiiuNBEKGiA. — Stigma 2-lipped ; calyx usually with long 



teeth 

 Shrubs ; anthers without spur at the base {except in 9) 

 but with a spiny crest on each lobe. 



Bracteoles covered with hairs 1. T. rufescens. 



Bracteoles glabrous, or only sparingly hairy. 

 Bracteoles leathery. 



Leaves large, ovate 2. T. vogeliana. 



Leaves small, cordate 3. T. longisepata. 



Bracteoles membranous. 

 Calyx-teeth long. 



Young branches hairy. 



Leaves glabrous, except on the midrib . . 4. T. malangana. 

 Leaves scabrid beneath, and hairy along the 



veins ^. T. adenocalyx. 



Young l)ranche8 glabrous. 



Peduncles less than 1^ in. long. 



Leaves usually large ; bracteoles more than 



1 in. long 6. T. offinis. 



Leaves small; bracteoles less than 1 in. 



long . . • . , . 7. T. erecla. 



Peduncles 1^-2^ in. long . . . . S. 2'. crispa. 



Calyx truncate . . . . . . . d. T. hoofceriano. 



Herbs, for the most part climbing; anthers usually 

 spurred beloio and with long hairs, 

 tLobes of the stigma firm, the lower rounded (deltoid in 

 21 and not known in 11) ; corolla-tube usually 

 widening to the throat. 

 Leaves sessile. 



Leaves twice as long as broad, or longer. 

 Erect herbs ; peduncles much shorter than 

 the leaves. 

 Leaves upwards of 4 in. long, more or less 



hirsute 10. T. annua. 



Leaves onlv 1 in. long, hispid . . . 11. T. hispida. 

 Climber ; peduncles exceeding the leaves . 12. T, paulitschkeana. 

 Leaves with their breadth more than half their 

 length. 



