Dr Graham's List of Kare Plants, 389 



take the trouble of verifying the facts which occur in each 

 species of tree in particular ; and examine if there be any 

 among them in which a suspension of the growth common 

 in the species does not produce layers irrespective of the cli- 

 mate, as happens in cold or very arid countries by a cause ex- 

 ternal to the tree. Certain observations which have been 

 made by M. A. Leduc, at Galega, and transmitted to M. de 

 Candolle at Geneva, manifest that in the Casuarina the number 

 of concentric layers does not at all correspond with the years 

 of the tree's age ; and that in a tree whose growth is only of 

 eight years, not fewer than forty- two concentric layers may 

 be counted. Further details may be found in the Bibl. Univ. 

 de Geneve, No. 65. 1841. 



Description of several New or Bare Plants which have lately 

 flowered in the neighbourhood of Edinburgh^ and chiefly in 

 the Poyal Botanic Garden. By Dr Graham, Professor of 

 Botany. 



10<A September 1841. 



Bignonia speciosa. — Tweedie. 



B. speciosa, foliis binatis, cirrhiferis, foliolis obovato-oblongis, lucidis ; 

 pedunculis terminalibus, bifloris ; starainibus pistillisque inclusis. 

 Bignonia speciosa. Bot. Mag. 3888. 

 Description. — Stem long, straggling, woody, climbing. Leaves petio- 

 late ; petioles (4^ lines long) opposite, spreading wide, bearing at tho 

 apex two leaflets, and having a long simple cirrhus between these ; leaf- 

 lets (about 3 inches long, 1^ inch broad) undulate, elliptical, glabrous 

 and shining, bright green, reticulate, on two slightly unequal partial 

 petioles less than half the length of the general petioles, midrib pro- 

 minent behind ; petiole, cirrhus, and one of the leaflets occasionallv 

 awanting, when the other leaflet is attached to the branch by its par- 

 tial petiole only ; leaves when very young, as well as the young 

 branches, the general and partial petioles, covered with short soft 

 pubescence. Stipules several, lanceolate, slightly coloured, scattered 

 upon the common petiole, caducous. Flowers lar^e and handsome, 

 geminate, terminal, erect, pcdicelled, the one expanding rather before 

 the other. Peduncles (I inch long) erect, parallel. Calyx campanu- 

 latc, green, glabrous, with six (5'?) shallow sinuosities, alternating 

 with an equal number of long subulate or filamentous erect teeth. 

 Corolla (nearly 3 inches long, and 2 across when fully expanded) co- 

 vered within and without with short pubescence ; tube compressed 

 dorsally, plaited below, yellowish on the outside, of brighter yellow 

 Avithin, and streaked with lilac ; limb bilabiate, ^ lobed, lilac, paler 

 on the outside, and having dark veins within, lobes blunt, undulate, 

 the upper reflected, tho lower longer, reflected towards tho apex, tho 

 two outer of the three repand. Stamens colourless and glabrous, tho 



