368 WILSON EXPEDITION TO CHINA 



the autumn they are often pale and more or less densely puberulous and yellowish- 

 brown and nearly glabrous. The prominent ovoid winter-buds are sUghtly villous 



or glabrous. 



On our specimens the leaves vary in length from 5-13 cm. and in width from 4-14 

 cm. and the petioles are from 2.5-5 cm. long. Often the teeth of the leaves are 

 well developed, but usually they are represented almost entirely by the characteristic 

 long aristate point which readily distinguishes this species from all other Chinese 

 Lindens. The ellipsoid to obovoid fruit is from 8-10 mm. long and from 4^6 mm. 

 wide, prominently 5-angled, slightly verrucose and tipped with the very short 

 remains of the style. 



With the material before us it is obvious that the varieties and form founded by 



V. Engler (1. c.) cannot be maintained. , 



A picture of this tree will be found under No. 705 of the collection of Wilson s 

 photographs and also in his Vegetation of Western China, No. 487. 



Tilia tuan Szyszylowicz in Hooker^s Icon. XX. t. 1926 (1890). 

 Diels in Bot. Jahrb, XXIX. 468 (1900). — Schneider, III Handh 

 Lauhholzk. II. 389, fig. 259 f-g (1909), 



Tilia Tuan, var. Cavaleriei, V. Engler and L6veiU^ in Eedde, Rep. Spec. N^- 

 VL 266 (1909). — v. Engler, Monog. Tilia, 124 (1909). — L6veiU6, FL 

 Kouy-Tcheou, 420 (1915). 



Tilia Tuan, var. a CavaleHei, f. divaricaiaX. Engler, Monog. Tilia, 124 (1909). 



Tilia Tuan, var, ^ pruinosa V. Engler, 1. c 124 (1909). 



Western Hupeh: Hsing-shan Hsien, thickets and woods, alt. 

 1300-2000 m., July 1907 (No. 2334; slender tree 5-8 m. tall, 0.3-0.6 m. 

 girth) ; Fang Hsien, woodlands, alt. 1600-2600 m., October 1910 (Nos. 

 4409, 4449; tree 10-16 m. tall, 1.5-2.3 m. girth) ; Patung Hsien, woods, 

 June 1901 (Veitch Exped. No. 2316; tree 10 m. tall). Eastern 

 Szeeh'uau: Wushan Hsien, A. Henry (No. 7452). Southeast 

 Szech'uan; Nan-ch'uan, A. von Rosthorn (No. 842). 



In the woods of western Hupeh this is a common tree of medium size with spread- 

 ing branches, glabrous shoots and glabrescent winter-buds. The bark on the 

 trunk of young trees is quite smooth and pale, but on old trees it is fissured and 

 rough. The leaves may be virtually entire with the teeth reduced to very short 

 mucro or they may be decidedly toothed. The bracts are remarkably long, often 

 exceeding the leaves. „ 



In Hupeh the colloquial name of this and all other species of Tilia is " T uan, 

 and the bark is used by peasants for making coarse sandals. 



In specimens before us we can find no difference between Rosthom'a No. 842 

 distinguished as var. pruinosa, and Henry's No. 7452, whereas Wilson's No. ^242, 

 considered by V. Engler the same as Rosthom's No. 842, has tomentose shoots and 

 villose winter-buds and belongs to our var. chinensis. 



A plant in the Arnold Arboretum received from Messrs. Chenault, Orleans, as 

 " Tilia sp. from China " belongs here, although a fruiting specimen of this plant 

 collected in Messrs. Chenault's muraery on August 30, 1911, looks less like typical 

 T. tuan than does our cultivated plant. The fact is that Tilia tuan Szyszylowicz 

 is the most variable of the Chinese species of Tilia. As an extreme form po-ssibly 

 belongs here Rosthom's No. 335^ from Nanch'uan with narrow leaves thinly 

 stellate-pubescent below. 



