412 DR. DONALDSON SMITH's ACANTHACE^. 



tube medio iuserta, anteriora longiora et antheris bilocularibus 

 instructa, loculi parallelis ellipticis, posteriora cum antheris mii- 

 locularibus. Pollen ellipticum, " spangen "-pollen. Stylus fili- 

 formis ; stigma capitatum apice sulcatum. Ovula in utroque loculo 

 gemina superposita ; funiculus induratus unciformis. Frutex ramis 

 validis, ramulis incano-tomentosis, et foliis parvis lanceolatis, ellip- 

 tico-lanceolatis vel ellipticis, in partibus juvenilibus glaudulifera. 

 Flores mediocres in spicis brevibus paucifloris aggregati. Bractege 

 inferiores foliacese, superiores sepalosfe ; bracteolaB angustae. 



Africa orientalis equatorialis. Species 1. 



Genus novum e tribo JusticiecB, subtribo BarleriecB. 



Liiidduca strikingly recalls Barle.ria in its 4-partite calyx with 

 narrow lateral and large broad median segments, the anterior of 

 which is bidentate ; and also in the sestivation of its corolla, and 

 the number and arrangement of its stamens. It differs, however, 

 in its markedly bilabiate corolla, a character which recalls Lopho- 

 stachijs and Volkensiophyton, and also in the form of its pollen. The 

 latter has three broad ribs united at the poles, and six narrow ribs 

 which are separated from the broader only by a very narrow furrow 

 which stops considerably below the two poles. The surface of the 

 ribs is corrugated, that of the narrower much more regularly and 

 conspicuously. A pore-bearing protuberance occupies the centre of 

 each of the diamond-shaped areas bounded by the narrow ribs. 

 " Spangen "-pollen has not yet been recorded in the subtribe 

 BarleriecB, but Lindau (Engler & Prautl, Pjianzenfam. iv. 8i, 306) 

 admits, though doubtfully, Forsjjthiopsis into his section IluelliecE, 

 though its pollen shows the same difference from the general form. 



I have named the genus after Dr. Gustav Lindau, who has done 

 much work on the order during the last few years. 



L. speciosa, species unica. Foliis obtusis breviter petiolatis, 

 Isete viridibus, glanduliferis ; bracteis superioribus ellipticis velut 

 sepalis pubescentibus et glanduliferis, 3-nerviis ; bracteolis anguste 

 lineari-lanceolatis vel subulatis ; calyce ad basin partito, sepalo 

 postico plus minus elliptico vel elliptico-obovato, acuto, 3-nervio, 

 antico elliptico-obovato vel anguste obovato, bifido, 2-nervio, 

 laterahbus lineari-subulatis, acutis, uninerviis ; corolla c^ruleo- 

 purpurea externe pubescente, labio postico angusto arcuato, antice 

 latiore, cum lobo medio miuore ; fructu, vix matura, oblanceolata 

 apice breviter rostrata. (Plate 362.) 



Hab. Low-lying country a little to the east of the River 

 Shebele, Dec. 30th,^ 1894. 



The plant is apparently of considerable size; the single specimen 

 consists of a stout woody branch 8 mm. in diameter, with a grey 

 bark, branching irregularly and bearing at the top a number of 

 rather crowded branches, the ultimate ramifications of which are 

 short densely-leaved shoots. The branches bear a thick greyish 

 tomentum, the ends of the shoots like the young leaves, the bracts 

 and the sepals bearing more or less numerous short capitate 

 glandular hairs. The largest leaves, which are lanceolate or 

 elliptically lanceolate, have a stalk about 2 mm. long, and a blade 

 15 by 5-7 mm. ; the leaves are generally smaller, about 12 by 4 mm. 



