254 DUBLIN UNIVERSITY 



Hub. — Growing among stones in the river-bed of the Tongat River, 

 30 miles from Natal, Mr. J. Sanderson. (Herb. Hook., T.C.D.) 



Descr. — A tall, slender, nearly glabrous shrub, with virgate branches. 

 Leaves on short petioles, patent, ovate oblong, 2-3 inches long, glabrous, 

 but minutely granulated on the upper surface, repand, obtuse or sub- 

 acuminate, veiny. Racemes terminal, unilateral (cymoid), many flow- 

 ered; bracts opposite, minute, subulate; pedicels 2-3 lines long, cer- 

 nuous, bracteolate at a line from the base. Calyx continuous with the 

 pedicel, equally 5-partite, with narrow- subulate segments. Corolla 

 nearly two inches long, pale lilac, of thin, membranous substance and 

 veiny, tubular below, campanulate upwards, with a deeply 5-lobed, 

 subequal, erect limb ; the segments oblong, blunt. Stamens inserted at 

 the top of the narrow part of the corolla, shorter than the limb ; two 

 perfect, with sagittate, equal-sided, 2-celled anthers ; two filiform, 

 nearly as long as the others, without anthers. Style filiform, with a 

 minute, bifid stigma ; ovary bilocular, with 2 ovules in each cell. Cap- 

 sule unknown. 



Described by Mr. Sanderson, its discoverer, as a beautiful shrub, 

 "one mass of most delicate, pendant, pale lilac, campanulate flowers." 

 Our figure, taken from a dried specimen, is perhaps too stiff, nor have 

 we been able, probably, to restore the delicate corolla to its true form. 

 I trust that this ornamental plant may before long be introduced to 

 English gardens. The generic name is given in honour of my venerable 

 friend, James Townsend Mackay, LL.D., author of " Flora Hibernica," 

 and for many years the able superintendent of the Dublin University 

 Botanic Gardens. " Mackay a" Arn. is the same as JErythropalum of 

 Blume, as I am informed by Dr. Hooker. 



Fig. 1, Mackaya bella, the natural size. Fig. 2, the calyx; 3, por- 

 tion of the limb of the corolla, showing the venation ; 4, the stamens ; 

 5, an anther ; 6, ovary (cut open) and style ; 7, stigma. More or less 

 magnified. 



Plate XXVII. 



Ceeopegia Bowkeri (Harv.), (Asclepiadacece). — C. Bowkeri: erecta 

 glabra ; caule tenui sub-ancipiti simplici, foliis anguste linearibus utrin- 

 que acutis internodio longioribus, pedunculis axillaribus unifloris vix 

 uncialibus, sepalis anguste linearibus, corolla tubo tenuiter striato ur- 

 ceolata inferne ventricoso, limbi laciniis tubum equantibus liberis lato- 

 linearibus plumoso-ciliatis intus villosis, coronae staminese lobis exteri- 



