226 JOURNAL OF THE ARNOLD ARBORETUM [vol. in 



P. S. I. No. 39900 as Populus Przewalskii, but that species has according 

 to the description elliptic leaves acute at base and only 3.5-5 cm. long 

 and pubescent capsules becoming glabrate. In the cultivated plant of 

 P. Purdomii the smaller leaves and those at the base of the shoots are 

 slightly pilose beneath, those of the more vigorous shoots are nearly 

 glabrous; on the upper surface they are dull green and rugulose and the 

 midrib above and the petioles are red. 



Populus koreana, sp. no v. 



Arbor ad 25 m. alta; ramuli initio viscido-glandulosi, teretes, annotini 



pallide brunnei; stipulae triangulares, acuminulatae, 5-6 mm. longae et 3-4 



latae; folia turionum elliptico-ovata vel elliptica ad ovato-oblonga, 7-15 



cm. longa et 4.5-8.5 cm. lata, interdum majora, breviter acuminata, 



acumine rarissime torto, basi pleraque rotundata rarius subcordata, ea 



ramulorum brevium elliptica-oblonga vel oblongo-lanceolata, 4-12 cm. 



longa et 1.8-3.5 cm. lata, rarius majora, acuta vel acutiuscula, basin 



versus angustata et late cuneata vel rotundata, crenato-serrulata dentibus 



glanduloso-mucronulatis, supra rugulosa vel rugosa, glabra vel initio ad 



costam mediam puberula intense viridia, subtus albescentia, glabra vel 



interdum in foliis ramulorum brevium ad costam et venas ut petiolus 



minute pilosula; petioli 0.5-1 cm. longi, glabri, in ramulis brevibus ad 



1.5 cm. longi et interdum minute pilosuli. Flores et fructus non visi. 



Korea. North Heian; foot of Mt. Ihikuba ,side of streams, E. H. lson,Wi 

 No. 8822 (type) July 24, 1917; Pakadong, Yusan district, E. H. Wilson, No. 

 10669, September 1, 1918; from around Shingishu on Yalu River, cultivated at 

 forestry station, E. IL Wilson, No. 8787, July 16, 1917. North Kankyo: 

 Funei, side of streams, abundant, E. H. Wilson, No. 8890, August 14, 1917; Mozan 

 to Jyosohya, water-courses, not common E. H. Wilson, No. 8935, August 17, 

 1917. 



Cultivated: Arnold Arboretum, under No. 10825; specimens collected: October 

 28, 1920, September 20, 1921. 



Though the flowers and fruits of this new Poplar are unknown it is so 

 distinct in its vegetative characters that there can be no doubt, that it 

 represents an undescribed form. It is apparently most nearly related to 

 P. Maximowiczii Henry and I w r as at first inclined to consider it a variety 

 of that species, but Mr. Wilson w r ho paid special attention to the Poplars 

 while in Korea says that it is quite different from P. Maximowiczii and 

 always easily distinguished chiefly by its viscid-glandular young shoots, 

 d that it is a smaller tree of different habit and of more southern dis- 

 tribution. From this new species P. Maximowiczii differs chiefly in its 

 puberulous young branchlets, glabrous but not viscid-glandular only in 

 younger seedling plants, in the broader leaves more or less pubescent be- 

 neath, rounded or subcordate at base and nearly always with a peculiar 



twist at the apex, in the generally longer puberulous petioles and in the 

 brighter yellow or orange-yellow color of the mature branchlets. The 

 third Korean species, P. Simonii Carriere, produces sometimes on vigorous 

 shoots larger leaves which resemble those of the other two species, but it 



