POLYGONACEAE. 



Determined by Camillo Schneider. 



POLYGONUM L. 



Polygonum multiflonim Thunberg, Fl. Jap. 169 (1784). — Meisner, 

 Mon. Gen. Polygon. 64, t. 4, fig. Q (1826); in De Candolle, Prodr. 

 XIV. 136 (1856). — Hemsley in Jour. Linn. Soc. XXVI. 342 (1891). — 

 Dammer in Bat. Jahrb. XXIX. 314 (1900). — Schneider, III. Handb. 

 Laubholzk. I. 259, fig. 169 i-m (1904). 



Western Hupeh : Ichang, alt. 100-900 m., September and 

 October 1907 (No. 437; climber 7-10 m. tall, flowers white); same 

 locality, A. Henry (No. 2343); without precise locality, A. Henry 

 (Nos. 82, 2488). Formosa: 1864, 72. OM/iam (No. 436). 



This species differs from the shrubby species of western Szech'uan, P. Aubertii 

 L. Henry (in Rev. Hort. 1907, 82, fig. 23, 24), which was raised from seeds collected 

 by Pere Aubert near Tachien-Iu, in its much more branched inflorescence the axes of 

 which bear a very dense fine glandular pubescence at the edges, in the glabrous 

 filaments, the smaller flowers and in the broader-winged fruits. P. Aubertii, of 

 which I know only cultivated specimens, is more closely related to P. baldschuani- 

 cum Kegel (in Act. Hort. Petrop. VIII. 684, t. 10 [1883]), but in the last species the 

 axes of the inflorescence are wholly glabrous, while in P. Aubertii there is a fine 

 glandular pubescence somewhat Uke that of P. viuUiflorum but not so dense. 

 The filaments of both the other species are finely pubescent toward their base 

 and the wings of the larger fruits are narrower compared with their size. 



Here may be mentioned a Rumex not collected during the Arnold Arboretum 

 Expeditions which is a very common woody plant in southern Szech'uan and 

 northern Yunnan. 



Rmnex hastatus D. Don, Prodr. Fl. Nepal. 74 (1825), fide Meisner in Wallich, 

 PI. As. Rar. III. 64 (1832); in De Candolle, Prodr. XIV. 72 (1856). — Hooker 

 f., Fl. Brit. Ind. V. 60 (1886). — Collett, Fl. Siml. 428, fig. 136 (1902). 



Northern Yunnan : on the walls of the city of Hoching, September 25, 1914, 

 C. Schneider (No. 2482; densely branched erect or procumbent shrub 0.3^.8 m. 

 tall) ; dry stony situations on the eastern flank of the Tali Range and on the walls 

 of the city of Tali Fu, October 8, 1914, C. Schneider (No. 2880; fruits reddish, 

 Bhowy). 



This species is a common plant in the Yangtsze Valley of southern Szech'uan; 

 I collected it in flower, in May 1914, between Yunnan Fu and Ningjiian Fu, where 

 it seems to reach the northern hmit of its range. 



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