162 



JOURNAL OF THE ARNOLD ARBORETUM 



[VOL. m 



Vaccinium Buergeri; V. ciliatum; *V. fragile; *V. hirsutum; V. hir- 

 tum var. Smallii; V. japonicum; V. membranaceum; *V. moupinense; 

 *V. praestans; V. scoparium; *V. urceolatum. 



Viburnum betulifolium; V. bitchuense; *V. bracteatum; V. buddlei- 

 folium; *V. Canbyi; *V. cinnamomifolium; V. cylindricum; *V. dasyan- 

 thum; V. Davidii; V. erosum; *V. erubescens var. Prattii; V. foetidum 

 var. rectangulum; *V. furcatum; V. Henryi; V. hupehense; V. ichangense; 

 *V. kansuense; V. lobophyllum; *V. lobophyllum var. flocculosum; *V. 

 molle; V. mongolicum; V. phlebotrichum; V. propinquum; V. rhytido- 

 phyllum; V. Sargentii; *V. Sargentii f. flavum; V. shensianum; V. thei- 

 ferum; *V. urceolatum; V. utile; V. Veitchii; *V. Wilsonii; V. Wrightii. 



Vitis amurensis; XV. Baileyana; V. betulifolia; V. Coignetiae; V. 

 Davidii; V. Davidii var. cyanocarpa; V. flexuosa; V. flexuosa var. 

 parvifolia; V. pentagona; *V. pentagona var. bellula; V. Piasezkii; V. 

 pulchra; V. reticulata; *V. Thunbergii var. sinuata; V. vinifera (form 

 cultivated at Peking). 



Whipplea modesta. 



*Xylosma racemosum var. pubescens. 



Zanthoxylum alatum var. planispinum; Z. Bungei; Z. dissitum; *Z. 

 Piasezkii; Z. piperitum; Z. setosum. 



The following hybrid trees and shrubs have been made at the Arbore- 

 tum or have appeared in it spontaneously : 



Roses 



Arnoldiana 



Dawson 



Farquhar 



Ida 



Lady Duncan 



Minnie Dawson 



Aesculus Harbisonii 



Cornus arnoldiana 



Berberis notabilis 



Betula Jackii 



Forsythia intermedia var. primulina 



Hypericum arnoldianum 



Hypericum Dawsonianum 



Hypericum nothum 



Loniceraamoenavar. arnoldiana 



Pauline Dawson 



Jacksonii 



Sargent 



Seashell 



W. C. Egan 



Malus arnoldiana 

 Malus Dawsoniana 

 Prunus arnoldiana 

 Pterocarya Rehderiana 

 Pyrus congesta 

 Rhododendron Anneliesae 

 Rhod. obtusum v. arnoldianum 

 Sorbus arnoldiana 

 Viburnum Jackii 



HAWTHORNS. 



During the last twenty-three years special attention has been given at 

 the Arboretum to the study and cultivation of North American Hawthorns. 

 Previous to 1899 some twenty species and varieties only had been recog- 

 nized by botanists, but in that year a number of the plants raised from 



