1925J NAKAI, TWO NEW GENERA OF BAMBUSACEAE 145 



rarius subrotundata, denticulata denticulis glanduloso-mucronatis, supra 

 laete viridia, costa impressa, venis lateralibus gracilibus, minute reticulata, 

 subtus pallida, juvenilia saepe rubescentia; petioli 6-10 mm. longi. Flores 

 non visi. Fructus solitarii vel 2-3 fasciculati e gemmis aphyllis ramulorum 

 annotinorum, pedunculis 8-12 mm. longis, oblongo-elliptici ad late obovati 

 vel suborbiculares, 2.5-3.5 em. longi et 1.8-2.5 cm. lati, basi cuneati vel 

 abrupte cuneati vel rotundati, alis 4 initio carnosis et lutescentibus, 

 maturitate siccis et roseo-luteis, apice stylo partim persistenti et calycis 

 vestigiis eoronati; putamen anguste cylindricum, costis 4 applanatis cum 

 alis alternantibus, plerumque abortu monospermum. 



Affinis II. carolinae L. (Mohrodendron carolinum Britt.) quae foliis 



plerisque latioribus stellato-pubescentibus et fructu plerumque obovoideo 

 differt. 



Ciikkianc;: Di-ping, northeast of Tai-Shun Hsien, alt. 790 m., Ren- 

 Chang Ching, July 18, 1924, Southeastern Expedition to Chekiang, no. 

 2132 (type) ; tree to 16 m. tall, in open thickets, leaves thicker; Mow Shan, 

 west of Lung-sien, alt. 1280 m., August 24, 1924, same collector and same 

 expedition, no. 2466; trees to 24 in. tall, 45 cm. in diameter, in shade, 

 leaves very thin, larger, to 13 cm. long and 4.5 cm. wide, oblong-lanceolate 

 to elliptic-oblong; fruit obovoid. Specimens of both numbers in the 

 Herbarium of Southeastern University, Nanking and the Herbarium of 

 the Arnold Arboretum. 



Tli is species is named in compliment to Mr. Donald MacGregor, Super- 

 intendent of Parks, Shanghai, who, in the course of over twenty years' 

 unceasing effort, has introduced numerous valuable plants, both foreign 

 and native, to the enrichment of Chinese gardens. 



The discovery of a species of Halesia in China makes another addition 

 to the list of genera once thought to be endemic in America, but subse- 

 quently also found to be indigenous in China. Some of the genera of 

 woody plants formerly considered purely North American now known to 

 be common to the two countries are: Hicoria, Liriodendron, Sassafras, 

 Nyssa, Symphoricarpos and Halesia. 



TWO NEW GENERA OF BAMBUSACEAE, 

 WITH SPECIAL REMARKS ON THE RELATED GENERA 



GROWING IN EASTERN ASIA 



T. Nakai 



Pleioblastus 1 , gen. nov. 



Arunduiaria Alunro in Trans. Linn. Soc. xxvi. 13 (1868), pro parte.— K Koch 

 Dendr. n. pt. 2, 375 (1873), pro parte.— Bentham & Hooker, Gen. PI. in 

 1207 (1883), pro parte— Hackel in Engler & Prantl, Nat. Pflanzenfam. n. 

 aht 2, 93 (1899), pro parte— Camus, Bamb. 26 (1913), pro parte— Non 

 Michaux. 



'Etymology: xXe:o?, more, gXa3?o;, bud, referring to the associated buds at the nodes. 



