316 



HOBTIOTJLTUEB 



September 2, 1916 



leaves. It is the latest of all barber- 

 ries to flower with us and blossoms 

 about the middle of July. The coral 

 red fruits are remarkably pretty in 

 late autumn. The tips of the branches 

 are occasionally winter-killed with us. 



ViEURxuM. Some important new 

 Viburnums have been introduced. V. 

 Carlesii, from Korea, is perhaps one of 

 the handsomest plants introduced into 

 American gardens in recent years. 

 The splendid merits of this shrub 

 have already appealed to some Ameri- 

 can nurserymen. It blooms with us 

 about the end of April and first week 

 of May. The unfolding pink buds and 

 white or faintly blush fragrant flowers 

 which follow, are remarkably attrac- 

 tive. The habit is compact. V. bud- 

 dleifolium from western China, has 

 oblong leaves from five to six inches 

 long and two inches wide, dark green 

 and rugose above, densely covered 

 with a felty white tomentum beneath. 

 About the middle of May it produces 

 pinkish tinted flower clusters, not par- 

 ticularly showy. It is quite hardy and 

 its foliage is very ornamental. V. 

 rhytidophyllum is a handsome ever- 

 green species. The rugose leaves are 

 six inches long and two inches wide 

 and covered with a pale rusty 

 tomentum beneath. The whitish flower 

 corymbs open about the middle of May 

 and the black fruits ripen in Septem- 

 ber. V. Veitchii has leaves thJt bear 

 a resemblance to V. lantana, but they 

 are much handsomer. This species 

 has not yet flowered with us but it 

 appears to be hardy. 



LoNicER.\. Amongst the new bush 

 honeysuckles from western China, 

 there are none so distinctive as Loni- 

 cera Maackii var. podocarpa. It is a 

 tall, robust, spreading bush with 

 showy white flowers. It is about the 

 latest of all Loniceras to blossom. 

 The handsome red fruirs are very 

 showy in October and November. The 

 type, L. Maackii, has very showy 

 white flowers but the fruits are less 

 conspicuous. 



Spiraea. A number of Spiraeas 

 have been introduced from China. 

 Spiraea Henry! is one of the best and 

 is a vigorous shrub, five to six feet 

 tall. The branches are festooned v. ith 

 numerous clusters of white flowers 

 about the middle of June. It has good 

 characteristic foliage and this can 

 hardly be said of a great many Spi- 

 raeas now in cultivation. Spiraea 

 Veitchii has a more up^iglii habit of 

 growth than S. Henryi and smaller 

 leaves which are very di=:tinctive. 

 The branchlets produce terminal clus- 

 ters of showy white flowers about the 

 end ol June. 



CoKNUs. Corhus paucinervis is a 

 beautiful low growing shrub from 

 Szechuan. Occasionally individuals 

 have a semi-prostrate habit. It has 

 numerous small lance-shaped leaves, 

 deep green above. Th.j cons-picuous 

 white flower clusters are borne on ter- 

 minal branchlets from July l.'jth to 

 20th, and it is the latest of all the 

 dogwoods to flower. 



Hamamelis. Hamamelis mollis 

 the handsome Chinese Witch Hazel, 

 was first introduced to cultivation by 

 E. H. Wilson through the late Veit- 

 chian nurseries of England. The large 

 orbicular-shaped leaves, deep green 

 above, are very ornamental. The 

 showy yellow flowers appear some- 

 times in mid-winter if the weather is 



mild. It is usually in good bloom 

 about the first of March. 



Indigofeba. Indigofera Kirilowii 

 is a handsome low shrub from Korea 

 and spreads into a compact mass. The 

 showy panicles of pink flowers ci,me 

 into bloom in July. This handsome 

 shrub was found in Korea a number of 

 years since by J. G. Jack. 



ExocHOEDA. Exochorda Giraldi, 

 from western China, is a handsome 

 flowering shrub and an important ad- 

 dition to the Chinese Pearl Bushes. 

 The flowers are larger than those of 

 E. racemosa. Our plants are small, 

 but I have seen large individuals in 

 the garden of Bayard Thayer, Lancas- 

 ter, Mass. 



I To to he continued) 



PUBLICATIONS RECEIVED. 



Seeding and Planting in the Prac- 

 tice of Forestry. By James W. 

 Toumey. M. S. M. A., Director of the 

 Forest School and Professor of Silvi- 

 culture, Yale University. The first 

 sensation on a glance over the chap- 

 ters of this book is a conception of its 

 thoroughness. A further perusal in- 

 tensifies this impression. The booK 

 presents both the details of practice, 

 and the fundamental principles that 

 control success and failure in the 

 economic production of nursery stock 

 and the artificial regenerations of for- 

 ests. It explains the why as well as 

 the how. 



The author states in his preface: 



"The practitioner must have a clear ap- 

 preciation of underlying principles or he 

 cannot be safely trusted to direct the de- 

 tails of nursery practice, seeding and plant- 

 ing. He must have a broad knowledge of 

 methods and tools in order that he may 

 attain successful regeneration at the least 

 cost." 



Almost without exception, the cul- 

 tural methods described and the tools 

 and machines figured, have been used 

 by the author, or are the results of the 

 work observed by him in this countr.v 

 or abroad. 



P^rt I of the book deals with the 

 silvical basis for seeding and planting, 

 more particularly the principles which 

 underlie the choice of species, the 

 closeness of spacing and the composi- 

 tion of the stand. Part II is descrip- 

 tive of the various operations in arti- 

 ficial regeneration and the results that 

 may be expected from the best prac- 

 tice. The chapter headings are: 



rart I.— Silvical Basis for Seeding and 

 Planting. 



Chapter I — Definitions and Generalities. 

 II and III— The Choice of Species in Arti- 

 ficial Regeneration. IV — The Principles 

 which Determine Spacing. V — The Princi- 

 ples which Govern the Composition of the 

 Stand. 



Part II. — The Artificial Formation of 

 Woods. 



Chapter VI— General Considerations. VII 

 and VIII — Forest Tree Seed and Seed Col- 

 lecting. IX— The Protection of Seeding and 

 Planting Sites. X — Preliminary Treatment 

 of Seeding and Planting Sites. XI— Estab- 

 lishing Forests by Direct Seeding. XII to 



XV — The Forest Nursery. XVI to XVII 



Establishing Forests by Planting. 



There are 454 pages, 6 by 9, 140 fig- 

 ures. The book is published by John 

 Wiley & Sons, Inc., New York, at $3.50 

 net. Copies may be obtained from the 

 office of HoRTieuLTURE at publisher's 

 price. 



Parasitic Rhizoctonias in America. — ■ 

 Prof. George L. Peltier of the Univer- 

 sity of Illinois is Plant Pathologist for 

 the Society of American Florists. He 

 makes no special report at the Con- 

 vention this year but the completion 



and issuance of the very elaborate 

 illustraited bulletin on his observations 

 and study of the fungus Rhizoctonia 

 makes a valuable addition to our 

 standard floricultural literature. The 

 document, which is sent out as Bulle- 

 tin 189, consists of 112 pages and can 

 be procured upon request addressed to 

 the Director, Illinois Agricultural Ex- 

 periment Station, Urbana, III. 



One of the most serious and trouble- 

 some diseases which must be con- 

 tended with by carnation growers in 

 this country is the co-called "stem rot" 

 due to the fungus Rhizoctonia. In 

 July, 1912, a study of this disease was 

 undertaken by Prof. Peltier, together 

 with a thorough investigation of those 

 diseases of vegetable, field, and flori- 

 cultural crops which are caused by 

 Rhizoctonia. 



The fact that 165 species of plants 

 are reported as being more or less 

 susceptible to Rhizoctonia Solani 

 Kuhn (Co)-ticiiim. vagum B. & C. ) 

 in the United States indicates the 

 wide distribution of the fungus in 

 this country. Plants belonging to the 

 families. Ainananthacae, Caryophylla- 

 ceae, Cruciferae, Legiiminosae, Solan- 

 aceae and Compositae are especially 

 susceptible. Under favorable condi- 

 tions the fungus can attack plants in 

 these families at any stage, when 

 grown either in the field or in the 

 greenhouse. 



The symptoms produced by Rhizoc- 

 tonia Solani (Corticium vagum) In 

 natural infection are largely similar 

 when appearing on the same type ot 

 host. The damping-off of seedlings 

 and cuttings, of which Rhizoctonia Is 

 the most common cause both in the 

 cutting bench and in the seed pan, is 

 identical with the various plants, as is 

 also the rotting of a number of root 

 crops. In most herbaceous plants, such 

 as the carnation, a stem rot is pro- 

 duced, the symptoms of which are 

 identical on the various hosts. On very 

 resistant plants, however, lesions only 

 are formed; these are apparently iden- 

 tical on the different hosts. 



Inoculation Experiments. 

 With the view ot determining the 

 degree of biologic specialization which 

 may exist between the various cultural 

 strains ot Rhizoctonia, or between 

 strains isolated from different hosts or 

 ot different geographical origin, cross- 

 inoculation experiments were con- 

 ducted involving about 3,000 cuttings, 

 2.000 plants, and 7,000 seedlings of 

 various kinds. With these, compari- 

 sons were made of about forty-five 

 strains of Rhizoctonia, many of which 

 were isolated by Prof. Peltier. When 

 carnation cuttings were infected, the 

 strains used, with but two exceptions, 

 whether from carnation or from other 

 hosts, were able to cause more or less 

 loss, the mortality of the cuttings 

 ranging in either instance from to 

 100 percent. Again, the same strains 

 varied in virulence from one year to 

 another, in most cases decreasing in 

 virulence with age. When cuttings 

 other than carnation were used, the 

 results were the same. It is shown 

 that when young rooted carnation 

 plants were inoculated, the percentage 

 of loss was much less than with cut- 

 tings. Here, however, the carnation 

 strains seemed to be slightly more 

 virulent than those from other sources, 

 although there was still a great dif- 

 ference in the strains from carnation 



