1923] REIIDER, COLLECTIONS OF THE ARNOLD ARBORETUM 107 



in the specimens examined is unusual and probably not a constant charac- 



ter - 



Crataegus Youngii, so far as now known, is confined to the Piedmont 



region and the Atlantic coastal plain, while C. Phaenopyrum, although 

 it has become sparingly naturalized from cultivation in eastern Pennsyl- 

 vania and northern Delaware, is a tree of the Mississippi valley, in which it 

 grows from western North Carolina at altitudes of about 700 metres to 

 middle Tennessee, southern Kentucky, and in southern Illinois and south- 



Missouri, and is now often naturalized in the Ohio valley states. 



NEW SPECIES, VARIETIES AND COMBINATIONS FROM THE 



ARIUM 



ARNOLD ARBORETUM. 



Alfred Rehder 



Cephalotaxus drupacea var. nana, comb. nov. 



C. nana Nakai in Tokyo Bot. Mag. xxxm. 193 (1919). 



C. nana var. adstringens Nakai, 1. c. 

 Japan. Hokkaido. Ishikari province: Sapporo, Y. Tokubuchi, April 1887, July 

 1888, May 1890; same locality, C. S. Sargent, September 17, 1892; Nopporo Forest, 

 K. H. Wilson, No. 7274, July 27, 1914 and No. 740X, August 10, 1914, T. Nakai, 

 August 1919. Siribeshi province: Takashima, J. Matsumura (ex Nakai). Hondo. 

 Akizu province: Inashiro, T. Nakai (ex Nakai, var. adstringens). 



Cultivated: Arnold Arboretum, Octot>er 14, 1922 (plants raised from seed [No 

 7588] collected by E. H. Wilson at North Kadoma, foot of Hayachine-san, Rikuchu 

 province, northern Hondo). 



As Cephalotaxus nana Nakai does not differ from typical C. drupacea 

 Siebold & Zuccarini except in its habit, it should be considered only a 



variety of the latter species. Its relation to the typical form is about 

 the same as that of Torreya nucifera var. radicans Nakai (Tokyo Bot. 

 Mag. xxxm. 194 [1919] ) to the typical T. nucifera Sieb. & Zucc 

 Nakai 's variety adstringens does not seem to be a very marked variety; 

 it is said to differ in the adstringent taste and in the brownish color of the 

 fruit from typical C. nana. Cephalotaxus drupacea nana is a low shrub 

 not exceeding 2.5 m. in height with a creeping root-stock producing at 

 intervals upright shoots which flower and fruit when about 1 m. tall. 

 The young plants growing in the Arboretum appear to preserve the habit 

 of the variety. 



Taxus media (T. baccata X cuspidata), hybr. nov. 



Intermediate between the parents; as the type may betaken the plant 

 mentioned below which forms a broadly-pyramidal bush with spreading 

 branches and which probably will grow into a tree. Mature branchlets 

 olive-green or slightly reddish above, somewhat darker the second year, 

 later becoming more or less brown; winter-buds oblong-ovoid, obtuse, 

 with obtuse slightly keeled scales; leaves spreading in two ranks, straight 



