339 



stout and. from 5*5-6 mm. long. The style is only 3'75-4 mm. 

 long with the papillate stigma forming 2-5-3 mm. of its length, and 

 the top of the stigma does not reach beyond the base of the anther 

 filaments. 



The long-styled flowers show some interesting points of 

 difference for the anthers which are rather smaller, being 1*75-2 mm. 

 long and having smaller glands, are syngenesious, opening ex- 

 rrorsely, and form a ring round the base of the style. The style is 

 9 mm,4 cm. long with a stigma 5 mm. long, and the stigmatic 

 surface is well above the anther lobes. 



A similar state of affairs is met with in Exochaenium primu- 

 laeflorum, Welw., which is also dimorphic, with the anthers 

 syngenesious in the long-styled flowers (v. Figs* E. and F.). 

 E. macranthum, A. W. Hill, however, differs from these two species 

 in not having syngenesious anthers. The variety homostyltim, 

 A. W. Hill, of E. grande is of interest since in this form the stigma 

 is on a level with the anthers, and the flowers are intermediate in 

 character between the long- and short-styled forms. The flowers 

 are smaller than in E. grande proper and the corolla is commonly 

 white, but the plants do not appear to be specifically distinct from 

 E. grande. This form has been described by Schinz in Bull. Herb. 

 Boiss., ii., 1894, 220, as Belmontia natalensis, and was transferred 

 to Sebaea in Bull. Herb. Boiss., vi., 1906, 732 (v. Figs. G., 16). 



E. grande appears to be mainly a southern form, and all the 

 tropical specimens, with the exception of Welwitsch's plant from 

 Huilla, have been placed under E. macranthum. 



Sebaea zambesiaca, Schinz, described by Baker as Belmontia 

 mmbesiaca in Kew Bull., 1894, 25, is evidently a species of 

 Exochaenium and closely allied to E. macranthum ; from the small 

 single specimen it is not possible to say whether it is a distinct 

 species or not. 



affinitate 



W. Hill [Gentianaceae-Exaceae] 



in 



•amis 



floribus brevi-staminibus liberis differet. 



Annua, erecta. Caulis simplex, 10-24 cm. altus, supra 

 axillaribus fioriferis instructus. Folia per paria 3-6 decussatim 

 disposita, inferiora minuta vel subulata, superiors 1*5-2*5 cm. 

 longa, -8-1-2 cm. lata, elliptico-ovata vel Ianceolata, acuta. 

 Flores solitarii vel in cymas laxas foliaceas pancifloras dispositi, 

 heterostyli. Calyx -9-1-4 cm. longus segmentis erectis lanceolatis 

 acutis vel acuminatis alatis, alae 1-1*5 mm. latae versus basin 

 latissimae. Gorollae tubus 1*2-1-6 cm. longus, infra suburceolatus, 

 supra infundibuliformis ; lobi 7 mm.— 1 cm. longi, 3-4*D mm. lati, 

 anguste ovato-lanceolati, acuti. Filamenta in tubo coroliae 

 M mm. supra basin inserts, in floribus brevi-staminibus circiter 

 ;3 mm. longa, crassiora, in floribus longi-staminibus 3-3*D mm. 

 longa, crassa ; antherae 1*25-1*75 mm. longae filamentis long s, 

 oiajores 3-glandulae, apice glandulis -5-*75 mm. longis. StyM w 

 floribus omnibus 4-6 mm longus, in floribus ^i-stominibM 

 Paullo brevior, stigmate 3*5-5 mm. longo, elongato-clavato, 

 papilloso. 



