26 GLEANINGS AND ORIGINAL MEMORANDA. 
colour ; along the middle are three raised lines, which terminate at the base of the central lobe in the form of three 
short rows of fleshy notches. At the base of the lateral sepals next the orifice of their spur is found on each side a 
thick callus. The species is nearly allied to D. Kingianwm and elongatum, but is much handsomer. 
492. Roscona PURPUREA. Smith. A half-hardy herbaceous plant with dark purple flowers. 
Native of Khasya. Belongs to Gingerworts. Blossoms in September. 
d from tubers sent to the Royal Gardens, from Khasya, in North-eastern Bengal, by Dr. Hooker ; and these 
specimens (flowering in September, 1851) exactly correspond with drawings made by that naturalist on the spot. They 
sufficiently accord with the original R. purpurea of Sir J. E. Smith, to satisfy us that it is identical with that species ; 
whereas, further north, in Sikkim-Himalaya, Dr. Hooker detected and drew and transmitted living plants to Kew of 
what has been called R. purpurea by us (in Exotic Botany), by Mr. Roscoe (in his fine work on Monandrian plants), 
truly distinct, though I am disposed to think them so: but whether species or varieties, our present plant, now we 
believe first reared in England, is the same with the original R. purpurea. This Himalayan species is sufficiently hardy 
to thrive in a cool pit, protected from frost. After the decay of the stems, the underground tuber-like rhizome remains 
in a dormant state during the winter. At this season the soil in the pots should be kept just sufficiently moist to preserve 
the tubers from shrivelling. Early in the spring these should be repotted in fresh soil, consisting of a mixture of light 
loam and peat, little or no water being given till they begin to grow, and then but sparingly ; for being of a soft fleshy 
630. 
493. CaraLPA Porrstt. Seemann. A half-hardy shrub, from Mexico. Belongs to Bignoniads. 
Flowers apparently pink. Introduced at Kew. 
A bush four to six feet high. Branches very smooth. Leaves coriaceous, li 1 late, entire, glaucous, Flowers 
from two to two and a half inches long. 
Two species of Catalpa, viz., 0 Sims, from North America, and C. longissima Sims, from the West 
Indies, have been for some time cultivated in the gardens of Europe. To these has been lately added a third from 
Mr. John Potts, and is now to be found in the gardens at Diisseldorf, Hanover, and Leipsig. This circumstance has 
induced me to name it, and I have accordingly done so after its discoverer. To the above short charact ,& more 
detailed account will be added in “ The Botany of H. M. S. Herald."— Seemana, in Allgem. Gartenzeit., Oct. 11, 185). 
494. RYTIDOPHYLLUM OrmsrEDTUI. Klotzsch. A half-shrubby hothouse plant, with greenish 
flowers spotted with purple. Belongs to Gesnerads. Native of Central America. Introduced by 
M. Warczewicz. 
bark of the tree on which the plant stands ; for this reason, and because it grows at a considerable height from the 
ground, and is thus subject to no inconsiderable daily change of temperature, its cultivation is difficult. e plant was 
vered by Dr. Oersted and M. von zewicz, in Costa Rica (Central America) growing on trees, 
: eG 5 . The hairs are, as in all the species belonging 
to this genus, jointed. The flowers are an inch and a half in length, the tube swollen and bent, three quarters of an inch 
in diameter. The corolla is hairy, with broad, rounded distinct lobes, green, with 1 — in A 
Gartenzeit,, Jan. 17,1852. : EN Een Ce MUN eee 
495. LENNEA ROBINIOIDES. Link, Klotzsch $ Otto. A Mexican greenhouse tree, with the 
