98 



ROSACEAE. 



Exochorda. Pearl Bush. 

 (Family Rosaceae). 



Shrubs with exfoliating brown 

 bark: deciduous. Twigs round, 

 slender, brown, glabrous, rough- 

 ened by lenticels and longitudinal 

 fissures: pith small, continuous, 

 pale. Buds moderate, solitary, 

 sessile, ovoid, with about 10 more 

 or less pointed and fringed scales. 

 Leaf-scars alternate, clustered 

 above, narrowly and shallowly U- 

 shaped or linear, somewhat raised: 

 bundle-traces 3: stipule-scars lack- 

 ing. 



Winter-characters of E. Alberti 

 are pictured by Schneider, f. 138. 

 Noting that the bud-scales of 

 Exochorda are 3-toothed at tip, 

 Sir John Lubbock, the most emin- 

 ent amateur naturalist of our day, 

 took the view that each scale may 

 perhaps represent a petiole-base 

 with adnate stipules, although distinguishable stipules do not 

 accompany many of the developed leaves. 



Lubbock's many and carefully made observations on the 

 buds of a great variety of plants were published first in the 

 botanical section of the Journal of the Linnean Society 

 Exchorda being noted on p. 494 of the thirtieth volume of 

 this series. They subsequently formed the foundation for a 

 convenient and very instructive volume On Buds and 

 Stipules. 



Fruit depressed, short (7-8 mm. long). (1). E. grandiflora. 

 Fruit obovoid, longer (12 mm.). (2). E. Alberti. 



