6£ JOT'RNAL OF THE ARNOLD ARBORETUM [vol. n 



and I followed him luiving seen at that time no specimens of either species. 

 Now I have before me flowering and fruiting material of the Formosan 

 plant and find that the flowers are quite different from those of P, Koch- 

 net: the calyx-lobes are short, ovate and obtuse or obtusish, the innnber of 



styles is 3 in the several flowers examined and the peculiar construction of 

 the disk in P. Kochnei as figured by Schneider is not i)resent. The species 



is much nearer to P, Callcryana and may be only a variety of it; it differs 

 chiefly in the ovate, obtuse or obtusish, not deltoid and acute calyx-lobes, 

 in the broadly elhptic to elliptic-oblong, more coriaceous leaves usually 

 cuneate not rounded at base and more deei)ly and sharply crenate-serrulate, 

 though similar leaves may l)e found on specimens of P. Callerycma from 

 Kwangtung. Tlie young leaves, the pedicels and the outside of the calyx 

 are cpiite glabrous. 



X Pyrus congesta, liybr. nov. {= P. betulifolia X claeagrijolia). 



Arbor ramis patentibus ramulis subpendentibus junioril)us rinereo- 

 tomentosis tomento ad secundum et partim ad tertium annum persistcnte. 

 Folia ovata vel elliptico-ovnta ad elliptico-lanceolata, acuminnta vel minora 

 acuta, basi rotundala vel cuneata, 3-6 cm, longa, ea turionuni semper an- 

 guste elliptica ad elliptico-lanceolata, basi cuneata et ad 7 cm. longa, basi 

 excepta argute serrulata, initio utrinque, su5)ra laxius tomentosa, demum 

 supra costa media villosa excepta glabra, intense viridia, lucida, subtus ])al- 



lidiora tomento tenui obtecta, nervis utrinque elevatis consjjicuis sub an- 

 gulo circiter 45° divergentibus; petioli 0.5-2.5 cm. longi, graciles, tomentosi. 

 Flores (!-() in umbclla satis densa 3 5 cm. diam., albi, 2-2.5 cm. diam.; pe- 

 dicelll 0.5 2 cm. longi, ut calyx villoso-tomentosi; calycis lobi triangularis 

 ovata, obLusiuscula, 1.5-2 mm. longa, reflexa, utrincjue villosa, dimidium 

 tubum acquaiites; petala ovalia, 0.8-1.2 cm. longa; stamina 25-30, j)ctala 

 dimidia aetpiantia; styli 3-4, rarissime 5, basi sparse pilosi vel fere gla1)ri, 

 staminibus breviores. Fructus subglobosi, 3-9 in umbella congesta, 1-1.5 

 cm. diam., brmiuei, punctulati, pedicellis robustis 0.5-1,5 cm. longis sufTulti, 

 calyce persistenti loins reflexis coronati; scmina 6 mm. longa, obovoidea. 



Cultivated at tlie Arnold Arboretum, of unknown origin, pro])al>ly from seed 

 collected in the ArlK)retum; type specimens colle<'ted ]May 13, 1909, and Sei)tenil)er 

 30, 1913, are preserved in the herbarium of the Arhoretnin, 



This hybrid resembles most P. betulifolia Bungc from which it chiefly 

 differs in the finely serrulate narrower leaves, those of the shoots mostly 

 ellii)ticdanccolate and cuneate at the base, tomentose on bolh sides when 

 unfolding and with permanent tomentum beneath, in the larger short- 

 stalhed flowers with 3-4 or rarely 5 styles and in the larger friiit with per- 

 sistent calyx. The other parent is apparently P. daeagrifoUa of which 

 there was a tree near the P, betulifolia from which the seed was probably 

 taken. From that species it is easily distinguished by the broader serru- 

 late leaves, the 3-4 styles, only very rarely 5, and the smaller fruit in dense 



clusters of from three to nine. 



(To be ccntinued) 



