STA.PELIEJE OF THUNBEim's HEBBA.BIT7M. 105 



This material being too imperfect to construct a genus from it, I 

 have derived the generic character chiefly from a closely allied 

 species sent to Kew by Sir Henry Barkly, of which the following 

 is a diagnosis. 



Trichocaulon flayum", sp. nov. (PL XI. figs. 2-4.) 



Corolla diametro 5-6 lin., sine tubo, extus levis, intus minute papillata, 

 flava. 



Hab. Karoo ? {Bain in Herb. Kew.). 



The smaller yellow corolla, destitute of any tube, easily sepa- 

 rates this species from its near ally T. piliferum. 



Boucerosia (§ Purisaistha). 



Char. sect. Corolla lobis angustis; corona duplex variabilis ; caules 4-6- 

 angulati, angulis spinoso-dentatis vel rarius inermibus. 



(2.) B. (§ Purisantha) mammillaris. (PL XI. figs. 5-13.) 



Ramis erectis, glabris, 6-angularibus; flores inter angulos fasciculati, pedi- 

 cellis 1 lin. longis, glabris; corolla campanulata, lobis anguste lanceo- 

 latis, acutis, marginibus valde revolutis, erecto-patentibus, extus levis 

 albida atro-purpurea marginata et maculata, intus lobis atro-purpureis, 

 minute setoso-tuberculatis,tuboalbido atro-purpureo maeulato; corona 

 atro-purpurea, exterior cyathiformis, 10-dentatis, interior 5-loba, lobis 

 biramosis, ramis interioribus ad apicem in cornu breve productis, ramis 

 exterioribus dentiformibus ad coronam exteriorem breviter adnatis. 

 Stapelia mammillaris, Linn. Mant. 216 ; Thunb. FL Cap. ii. 166. — Pec- 

 tinaria mammillaris, Sweet, Hort. Brit. 357. — Piaranthus mammillaris, 

 Don, Gen. Syst. iv. 114. — Stapelia pulla, Ait. Hort. Kew. ed. 1, i. 310; 

 Mass. Stop. 21, t. 31 ; Bot. Mag. 1. 1648.— S. (§ Pectinaria) mammil- 

 laris, DC. Prod, viii, 663. — Piaranthus pullus, R. Brown in Wern. Soc 

 i. 23 ; Haw. Synop. 44; Benth. Gen. PI. 782; DC. Prod. viii. 650. 



Hab. in rupibus collium prope Olyfants-rivier versus septen- 

 triouem, in Karoo juxta Hexrivier et alibi (Thunberg). 



Thuuberg's specimen consists of three bits of stem and one 

 flower; on examination, I found this to be identical with the spe- 

 cimen of S. pulla in tbe British Museum (PI. XI. f. 11), which I 

 cannot separate specifically from the specimens sent to Kew by Sir 

 Henry Barkly (PL XI. f. 7-1 0). Figs. 7 and 8 are respectively side 

 and front views of the corona from one plant ; figs. 9 and 10 are 

 similar views of the corona from another plant. These outlines 

 show how variable is the corona in different individuals of the 

 same species ; for beyond these differences in the coronas there 

 was no difference between the stems and flowers of the two plants. 

 Thunberg' s specimen has a corolla like fig. 5 and a corona like 



