84 WILSON EXPEDITION TO CHINA 



2800 m., July 3, 1908 (No. 1935); southeast of Sungpan, woods, alt. 

 2400-2700 m., August 1910 (No. 4507). 



Acer fulvescens Rehder, n. sp. 



Arbor usque ad 20 m. alta trunco ad 65 cm. diam.; cortex trunci 

 modice laevis, longitudinaliter leviter tantum fissus, cinereus v. flavido- 

 cinereus, lenticellis brunneis saepe in series horizontals confluentes 

 dispositis instructus. Ramuli juniores glabri, annotini pallide brunnei 

 v. griseo-brunnei v. grisei, lenticellis paucis instructi. Gemmae brun- 

 neae, perulis 4-6 exterioribus. Folia membranacea, graciliter petio- 

 lata, circuitu suborbicularia, basi rotundata v. subcordata, plerum- 

 que trilobata, interdum lobis duobus basalibus minutis additis, sinu- 

 bus latissimis apertis, lobis brevibus late triangulari-ovatis, subito 

 longe acuminatis, 5-9 cm. longa et 5-10 cm. lata, supra glabra 

 et laete viridia, subtus pallidiora, minute reticulata, tomento villoso 

 initio flavescente, demum fulvescente laxe obtecta; petioli glabri v. 

 tantum apicem versus pubescentes, rarius toti puberuli, 2.5-6 cm. 

 longi. Corymbus pedicello glabro, 2-3 cm. longo insidens, laxus, 

 multiflorus, pedicellis gracilibus glabris v. apicem versus puberulis v. 

 interdum corymbus totus puberulus; flores desiderantur. Samara 

 alis horizontalibus loculo compresso 8 mm. longo incluso 3 cm. longis, 

 supra medium latissimis et circa 1 cm. latis, juniora purpurascentia, 

 demum pallide flavido-brunnea. 



Western Szech'uan: Pan-lan-shan, west of Kuan Hsien, woods, 

 alt. 2100-2700 m., September 1908 (No. 1004, type); Wa-shan, woods, 

 alt. 1800-2300 m., October 1908 (No. 1162); Mupin, woods, alt. 1500- 

 2000 m., July 1908 (No. 1907). 



Acer fulvescens seems most nearly related to Acer pictum Thunberg, which has 

 the branches covered with the same land of bark, but differs in the glabrous gen- 

 erally five-lobed leaves and the shorter wings of the fruits. Acer longipes, which is 

 very similar, is easily distinguished by the smooth greenish or purplish bark of the 

 younger branches without lenticels, the perfectly glabrous corymbs and petioles 

 and by the larger leaves, their pubescence being not yellowish or fulvous. Nos. 1162 

 and 1907 differ from the type hi their puberulous inflorescence. No. 1907 has even 

 the whole petioles and the young branchlets below the nodes puberulous. 



Acer cappadocicum Gleditsch, in Schrift. Gesell. Naturf. Freunde Ber- 

 lin, VI. 116, t. 2 (1785). 



Acer monspessulanum, var. /3 Linnaeus, Sp. 1056 (in part as to syn. Tournefort) 



(1753). 

 Acer laetum C. A. Meyer, Verz. Kauk. Pflanz. 206 (1831). Pax in Engler, 



Pflanzenreich, Heft 8 (IV. 163), 48 (1902). Rehder in Sargent, Trees and 



Shrubs, I. 177 (1905). 



