60 JOURNAL OF TIIE ARNOLD ARBORETUM [vol. ii 



of the inflorescence. The tomentose form described as P. snbferruginca 

 which scarcely differs from P. aromatica^ may possibly ]>c kept as a distinct 

 form of the var. hondoensis, while the type of the variety represents the 

 gla])rescent or glabrous form. In Korea and particularly in southern 

 Korea a form with longer pedicels occurs, but the shape and serration of 

 the leaves is that of ty})ical P. iissuriensis. 



Pyrus ussuriensis var. ovoidea, var. nov. — P. ovoidca Rehder in Proc. 

 Am. Acad. L. 228 (1915); in Moeller*s Deutsch. Gaertn.-Zeit. xxxi. 102, 

 fig. 2 (1916). — Nakai, Fl. Sylv. Ivor. vi. 48, t. 17 (1916). — Bailey, Stand. 

 Cycl. Hort. V. 2869, fig. 3278 (1916). 



The addition of the var. hondoensis to P. w55uriV;z5i5 has lessened the differ- 

 ences between P. ovoidea and P. iissuriensis and there remains now only the 

 shape of the fruit which can hardly be considered a S})ecific character in 

 Pyrus. It therefore seems necessary to reduce P. ovoidea to a variety of 

 P. ussuriensis. 



To P. ussuriensis as synonyms or varieties belong probably the follow- 

 ing recently published species based mostly on cultivated plants: P. acidnhi 



Nakai in Tokyo Bot. Mag. xxx. 27 (1916); FL Sylv, Kor. vi. 49, t. 18 

 (1916). — P. Maximowicziana Nakai, 1. c. 50, t. 20 (1916). — P. macrostipes 

 Nakai, I.e. 28 (1916); I.e. 52, t. 22 (1916).— P. ri'h'^ Nakai, I. c. 28(1916); 

 L e. 51, t. 21 (1916). — P. crassipes Kickuhi & Nakia in Tokyo Bot. Mag. 

 XXXII. 35 (1918). — P. obovoidea Koidzumi in Tokyo Bot. Mag. xxxiii. 

 123 (1919). — P. insueta Koidzumi, 1. c. 123 (1919). — P. tremulans 

 Koidzumi, 1. c. 126 (1919). — P. insuho. Koidzumi, 1. c. 127 (1919).— 

 P. iwatensis, Koidzumi, 1. c. 127 (1919). — P. namhuana Koidzumi, 1. c, 

 128 (1919). — P. jueunda Koidzumi, 1. c. 128 (1919). 



Pyrus serrulata Rehder in Proc. Am. Acad. l. 234 (1915); in Sargent, PI. 

 Wilson. II. 263 (1915); in Moeller's Deutsch. Gaertn.-Zeit. xxxi. Ill, 

 fig. 7 (1916).— Bailey, Stand. Cycl. Ilort. v. 2870 (1916). 



From the specimens collected by Wilson in China this species was de- 

 scribed as having 3—1 styles and a deciduous calyx, but ])lants raised at 

 the Arboretum from seed collected at the same time in Cliina produced 

 flowers with usually 4, very often 5, but very rarely 3 styles and with partly 

 persistent and partly deciduous calj^; between the nundjcr of styles or 

 locules and the behavior of the calyx there seemed to be a slight correlation 

 in so far as a larger percentage of the fruits with deciduous calyx liad five 



locules. The few fruits, too, of a specimen collected by Professor L. II. 

 Bailey at Kuling, Kiangsi, in 1917, which otherwise looks like P. serndata, 

 shows five styles and persistent calyx. Whether the variation in the num- 

 ber of styles and in the behavior of the calyx indicates hybrid origin of P. 

 serrulata or simply a tendency of the species to vary, I am not yet prepared 

 to say. In species with normally deciduous calyx it occurs sonieti 

 as I have observed in P. beiulijolia, P. Calleryana var. Fauriei and in P. 

 pashia, that the calyx wholly or i)artly persists, but in this case the fruits 

 often do not seem to be quite normal and sometimes arc seedless. 



