466 JOUENAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Kennedya Beckxiana (Bot. Mag. tab. 8358). — Australia. Family 

 Leguininosae ; . irihe Phaseoleae. Herb, climbing ; leaves pinnately 

 3-foliate; peduncles 2-flowered; corolla 1-| inch long; petals red, 

 except for a greenisli-yellow dark-margined patch at the base of the 

 standard. — G. H. 



Larch Sawfly;. By A. Edwards {Trans. Roy. Scott. Arbor. Soc. 

 xxiv. 1, pp. 4:2-4:4.; January 1911). — Describes measures adopted to 

 combat the large larch sawfly {Nematus ericJisonii) at Thirlmere. 

 The following were found useful: crushing larvas by hand; spraying 

 with arsenite of copper mixed with equal quantity of flour ; dislodging 

 larvae by shaking the trees, and preventing return by tar band on 

 stem.— . G. S. 



Larkspurs. By F. Eeutersheim {Gartenflora, vol. Ix. pt. 3, 

 pp. 57-59). — Larkspurs require a sunny, open position and a good 

 supply of water and mulching in dry weather. By cutting the flower- 

 stems when the blooms fade, another crop of flowers may be obtained 

 in autumn. Delphinium Belladonna grandiflorum * Hesse ' and 

 ' Nassau ' are good varieties. — >S'. E. W. 



Leaf-fall, The Morphology of. By E. Lee (Atm. Bot. xxv. 

 Jan. 1911, pp. 51-106; with 3 plates). — -An anatomical investigation of 

 method of leaf- fall in Dicotyledonous plants. After a summary of 

 previous work the writer gives an account of the methods of defoliation 

 obtaining in some 40 or 50 plants. His conclusions are as follows :^ — 

 In Dicotyledons the essential modification at the leaf -base in connexion 

 with leaf-fall is the formation of a Separation-layer which is produced 

 from existing cells with or without division. The leaf separates from 

 the stem by the disappearance of the middle lamellae of the cells of the 

 separation-layer, and the subsequent rupture of the sieve-tubes and 

 vessels of the leaf-trace at that level. A Lignified-layer may or may 

 not be present, but Protective-layer is invariably produced either 

 before or after leaf-fall. 



The mode of formation of the Protective-layer is (1) ligno-suber- 

 ization of the cells of the leaf-base with or without irregular division ; 

 (2) by ligno-suberization of cells produced by the continued division of 

 a regular cambium. The protection of the tissues of the stem under- 

 lying the scar is aided by the production at a later date of a layer of 

 cork cells which subsequently becomes continuous with the periderm of 

 the stem. In many species the persistent leaf or leaf -scar is thrown 

 off during the second year. — A. D. C. 



Lilac Mite. By L. Linsbauer {Oester, Gart. Zeit. vol. vi. 

 pt. 6, pp. 201-206; 1 fig.). — The lilac bud mite, Eriophyes Lowi, 

 attacks Syringa vulgaris and *S'. duhia, but S. persica is immune. It 

 causes excrescences in the form of an eruption of twiggy growths, the 

 so-called witch's broom. Spraying is of no use; full exposure to 

 sun and air is the best safeguard against this pest. — S. E. W . 



