1922] REHDER, NEW SPECIES, VARIETIES AND COMBINATIONS 219 



hitherto almost unknown botanically. The Chinese name of this Maple 

 "tsin pi tuan" meaning "green bark Linden" refers to the conspicuous 

 smooth green bark of the branches. Young plants of this species raised 

 from seed sent by Mr. Hers are growing in this Arboretum. 



Aesculus discolor var Koehnei, nom. nov — Aesculus humilis Koehne 

 Deutsch. Dendr. 386 (1893), not Loddiges. — Rehder in Bailey, Stand. 

 Cycl. Hort. I. 228 (1914), as to description. — A. Pavia var. humilis Voss, 

 Vilmorin's Blumengart. I. 184 (1894), as to description, not Mouillefert. 1 — 

 Rehder in Bailey, Cycl. Am. Hort. i. 32 (1900), as to description. — 

 Schneider, 111. Ilandb. Laubholzk. n. 252 (1909), as to description. 



This variety differs from the type in its lower stature forming a shrub 

 only a few feet high, smaller leaflets 6-12 cm. long and smaller panicl s 

 usually less than 10 cm. long. The origin of this form is unknown; it 

 was first described by Koehne from cultivated plants growing in Spaeth's 

 nursery near Berlin and plants received from the same nursery are now 

 growing in this Arboretum. 



Aesculus turbinata Bl. var. pubescens, var. nov. 



A typo recedit foliolis subtus tota facie in costa venisque densius 



breviter villosis, petiolo praesertim apicem versus satis dense pilosulo. 



Japan. Hondo: "in silvis Aomori, " U. Faurie, No. 5022 (type), June 1902; 

 Nikko, C. S. Sargent; Sept. 2, 1892; Mt. Buko, Musashi, K. Sakurai, June 9, 



1903. 



Hokkaido: Mororan, C. S. Sargent, September 14 and 25, 1892; common in 



moist woods, E. H. Wilson, No. 7057, July 2, 1914. 



This variety differs in the soft pubescent under side of the leaves from 

 the type which is described by Blume as having puberulous petioles and 

 the under side of the leaflets glabrous except bearded in the axils of the 

 veins and puberulous on the midrib and often on the veins. In the 

 type specimen and in Sargent's specimen from Mororan, collected on 

 September 2, the pubescence is so dense that it could almost be called 

 tomentose, while in the other specimen it is less dense. In the Japanese 

 specimens of A. turbinata before me the leaflets beneath are either quite 

 glabrous with the exception of axillary tufts of hairs or they represent the 



1 Aesculus Pavia var. humilis Mouillefert, Arb. Arbriss. n. 709 (1894). — Voss, Vilmorin's 

 Blumengart. I. 184 (1894), excl. description.— Rehder in Bailey, Cycl. Am. Hort. I. 32 (1900) 

 and in Bailey Stand. Cycl. Hort. I. 228 (1914), excl. description — Aesculus humilis Loddiges 

 apud Lindley in Bot. Reg. xn. t. 1018 (1826). — Pavia humilis G. Don apud Loudon, Hort. 

 Brit. 143 (1830).— Sweet, Hort. Brit. ed. 2, 83 (1830).— G.Don, Gen. Syst. 1.653(1831).— 

 Spaeh, Hist. Veg. m. 31, (1834).— Pavia rubra 4. humilis Loudon, Arb. Brit. i. 470 (1838). 

 Aesculus Pavia var. nana Dippel, Ilandb. Laubholzk. n. 404 (1892). 



Of this form which is easily distinguished from A. discolor var. Koehnei by its narrower 

 more deeply and irregularly serrate leaflets sparingly pubescent only on the veins and veinlets 

 beneath I have seen specimens collected in 1880 by G. Nicholson in the Kew Arboretum 

 under the names Pavia rubra humilis pendula, Pavia pendula and Pavia pumila, which agree 

 well with Lindley's figures and his description of the pubescence of the leaflets as "subtus 

 praecipue ad venas leviter pubescentia. " As Loudon remarks his A. rubra humilis pen- 

 dula (1. c.) is not a distinct variety, but only the var. humilis grafted high. 



