DENDROBIUM 



DENDROBIUM 



979 



few years, are very decorative, and the plants may 

 be increased by taking off the young plants that often 

 appear on the stems. These often can be grown 

 on to strong flowering specimens, and thus the stock 

 maintained. When wintered in a temperature less 

 than 60, the plants suffer, and great care is neces- 

 sary at the time the young growths appear in spring 

 to prevent damping off. Small pots or pans are best, 

 and always keep the plants suspended near the sun 

 and air. The evergreen tropical species, as D. densi- 

 florum, D. thyrsiflorum, D. aggregation, D. Farmeri, D. 

 moschatum, D. fimbriatum and D. Dalhousieanum, also 

 need warmth in winter and must not be dried severely 

 during the resting-period or loss of vigor will ensue at 

 the price of blooming. This section of the genus pro- 

 duces flowers from the old stems for many years. It 

 frequently happens that growths made in India will 

 bloom long after the plants have become established 

 in gardens. It is thus unwise to cut old growths unless 

 they become withered or dead. Enough water may be 

 given to keep the plants plump, and the flowers will 

 be produced freely in their season. In some species, 

 growth begins before or at the time of bloom. This is 

 usually a sign of extra vigor and should not be dis- 

 couraged. The proper time to repot with all plants of 

 flowering age, is when they begin to recuperate in early 

 summer after the bloom is past; young roots will be 

 seen pushing out at the base of the stems, and if this 

 is anticipated by a week or two, the new material is 

 soon taken to by the roots and no check is experienced. 

 Good sound osmundine is the best material, always 

 using small receptacles rather than large, and if larger 

 than a 6-inch pot or pan, use perforated ones. The 

 roots do not like exposure, but the material will be 

 kept in a sweet healthy condition. Moss is best avoided 

 in most cases; it often fails to grow, and is inimical to 

 the welfare of the plants; when it does grow, it holds 

 too much moisture about the roots. (E. O. Orpet.) 



INDEX, CONTINUED. 



GENERAL KEY TO SECTIONS. 

 A. Lvs. equitant. 



SECTION I. Species 1 and 2. 



AA. Lvs. not equitant. 



B. Lf. -sheaths black-hairy. 



SECTION II. Species 3-1O. 



BB. Lf. -sheaths not black-hairy. 



c. Pseudobulbs not thickened at base. 

 D. Mentum or chin of fls. elongated. 



SECTION III. Species 11-14. 



DD. Mentum or chin of fls. short (rather 



long in D. ramosum). 

 E. Fls. usually in pairs, rarely 1 or 3 



or more. 



F. The pseudobulbs leafless at flower- 

 ing time. 



SECTION IV. Species 15-44. 



FF. The pseudobulbs leafy at flowering 

 time. 



SECTION V. Species 45-55. 



EE. Fls. in 3- to many-fld. racemes (single 



in D. Jenkinsii). 

 F. The pseudobulbs 1-lvd., short, fusi- 



SECTION VI. Species 56 and 57. 



FF. The pseudobulbs several-lvd. 

 G. Racemes very short, glomerate. 



SECTION VII. Species 58. 



GO. Racemes usually long, not glom- 

 erate. 



H. Sepals and petals hairy ex- 

 ternally; lateral lobes larger 

 than middle lobe of lip. 



SECTION VIII. Species 59. 



HH. Sepals and petals glabrous 



externally. 



I. Pseudobulbs gradually at- 

 tenuated from a thick 

 bulbous base. 



SECTION IX. Species 60. 



II. Pseudobulbs not bulbous at 



base. 



j. Fls., at least the lip, pur- 

 ple or red. 



SECTION X. Species 61-63. 



jj. Fls. white or yellow. 



SECTION XI. Species 64-75. 



cc. Pseudobulbs fusiform - thickened above 

 base, attenuated beyond. 



SECTION XII. Species 76. 



SECTION I. 



A. Pseudobulbs leafy at base, naked above. 1. Macfarlanei 

 AA. Pseudobulbs leafy throughout 2. anceps 



1. Macfarlanei, Reichb. Pseudobulbs erect, nearly 

 cylindric, up to 9 in. tall, 2-3-lvd.: Ivs. 3-4 in. long: 

 racemes 8-15-fld.; fls. 4-5 in. across, white, except the 

 purple markings on lateral and middle lobes of lip. 

 New Guinea. 



2. anceps, Lindl. Pseudobulbs tufted, compressed, 

 5-8 in. long: Ivs. up to 3 in. long, fleshy, laterally com- 



Eressed: fls. axillary, solitary or in very short racemes, 

 smon-yellow at maturity. Trop. Himalayas. B.R. 1239. 

 B.M. 3608 and L.B.C. 19:1895 (as Aporum anceps). 



