462 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



3. Platyopuntias and Nopaleas (tall, medium, and decumbent). 



4. Cylindropuntias (tall, medium, and prostrate). 



5. Foliage-bearing Cacti (climbing and shrubby). 



6. Climbing night-blooming forms of Cereus. 



7. Plants native to moist Tropical Regions (terrestrial and 

 epiphytic). — M. L. H. 



Calanthe Siebertiana. By R. Schlechter (Orchis, vol. vii. 

 pt. iii. pp. 35-37; 1 plate). — The hybrid obtained by fertilizing 

 C. x Veitchii with C. cardioglossa bears flowers which resemble 

 C. x Veitchii in form, colour, and size. The labellum is broader and 

 beautifully marked. — S. E. W. 



Calanthe sylvatica. By R. Schlechter (Orchis, vol. vii. pt. i. 

 pp. 4, 5 ; 1 coloured plate). — Calanthe sylvatica, from Madagascar, 

 resembles C. natalensis. It thrives in a compost of loam, sand, and 

 leaf mould in a warm greenhouse. — 5. E. W. 



Calypso bulbosa, Rch. By G. E. F. Schulz (Orchis, vol. vi. 

 pt. vi. pp. 95-99; 3 plates). — Calypso bulbosa, better known as C. 

 borealis, " the Pearl of the Arctic Circle," is found on either side of 

 the Arctic Circle in Europe, Asia, and America, more particularly 

 in the island of Vancouver — growing in old fir forests, where it is 

 buried in snow in winter, provided with copious supplies of water 

 when the snow melts, and is dust-dry later in the year. 



The flower is as beautiful as the Lady's Slipper ; the edge of the 

 slipper is white or pale lilac, the body red-brown, and the remain- 

 ing petals are lilac. The cultivation of this orchid presents many 

 difficulties.— 5. E. W. 



Capoc-yielding Cotton-wool Trees of the German Colonies in 

 Tropical Africa. By E. Ulbrich (Not. Konig. Bot. Berlin, vol. vi. 

 no. 51, pp. 1-34; April 1913; with 4 text figures). — Capoc, a name 

 originally applied to a particular cotton-wool-bearing tree, is now 

 employed to signify the product of the tree, viz., the wool from the 

 interior of the capsules of Ceiba and some species of Bombax. 



Lower India, and especially Java, has long been the chief locality 

 from which capoc is derived. More recently Togo and German East 

 Africa have also furnished a supply of capoc. The cotton-wool trees are 

 often very tall, sometimes attaining a height of 60 metres ; their trunks 

 are usually unbranched in the lower part, the wood is brittle, and the 

 branches usually bear spines. These characters make the gathering 

 of fruit-capsules from the tree difficult, and in the case of the wild- 

 growing trees it is necessary to wait until the capsules fall to the 

 ground. Where the tree is cultivated, it is usually pollarded when it 

 becomes too high, and finally cut right down and cuttings planted 

 afresh. 



In planting cuttings branches are selected which are about as 

 thick as a man's arm, and these are planted 1-1J metre deep in the 

 ground and the leaves removed. These soon strike and usually grow 



