BETULACEAE. — CORYLUS 453 



apex; their serration is coarser and they are mostly distinctly lobed above the 

 middle, the pointed apex being somewhat shorter and broader. The involucre of the 

 fruits of the typical C. Sieboldiana is contracted above the nut in a narrower tube 

 which is 1 3^-2 times as long as the nut, while in var. mandshurica this tube is less 

 contracted and mostly twice as wide. There is no distinct difference in the setose 

 pubescence of these varieties, but usually the bristles seem to be not so straight and 

 often less numerous in the southern form than in that of northern Japan and 

 Mandshuria. The typical C. Sieboldiana is said by Nakai to occur in southern Korea 

 (Chiri-san). From this region he also mentions the following variety which seems 

 to differ only by its smooth involucres being without bristles or with only a few 

 setose hairs. 



Corylus Sieboldiana, var. mitis Nakai in Tokyo Bot. Mag. XXIX. 37 (1915). 



Corylus rostrata, var. mitis Maximowicz in Mel. Biol. XI. 320 (1881); in Bull. 

 Acad. Sci. St. Petersbourg, XXVII. 539 (1882). — Herder in Act. Hort. 

 Petrop. XI. 363 (1890). — Winkler in Engler, Pjlanzenr. IV.-61, 52 (1904). 



JAPAN. Hondo: prov. Suruga, Fuji-san, 1864, Tschonoski (type with ripe 

 fruits and flowers). 



The fruits are rather small with a very narrow tube and a yellowish brownish 

 gray soft fine pubescence mixed with a few setose hairs. Otherwise there is scarcely 

 a real difference between this variety and the typical C. Sieboldiana. The leaves 

 of var. mitis also much resemble those of C. hallaisanensis Nakai (see above), 

 which may turn out to be nearly related to this form, which is said by Nakai 

 to occur also on the Chiri-san in southern Korea. The anthers of var. mitis are red- 

 dish as in the typical species and in var. mandshurica, but they are yellowish in the 

 American C. rostrata Alton and C. californica Rose (C. rostrata, var. californica 

 A. De Candolle). 



There are specimens of northern Hondo and Hokkaido which represent an- 

 other variety which may be described as follows: 



Corylus Sieboldiana, var. brevirostris Schneider, n. var. 



Frutex 1.5-1.8 m. altus; ramuli novelli ut videtur satis dense hirtello-villosi et 

 glanduloso-hirti, autumno plus minusve glabrescentes, flavo-brunnei, lenticellis 

 albido-flavis conspersi, vetustiores cinereo-brunnescentes, paulo rimosuli, glabri; 

 gemmae ut videtur ovato-ellipticae, obtusae, perulis purpurasccntibus dorso fere 

 glabris margine dense villosulis cinctae. Folia crasse papyracea, late obovata v. 

 elliptica, basi cordata, paulo v. vix inaequilateralia, apice obtusa v. fere subrotunda 

 in acumen brevem satis subito producta, margine inaequaliter dentato-serrata, 

 baud lobulata, supra laevia, intense viridia, tantum costa nervisque imprcssis paulo 

 puberula, subtus pallide viridia, costa nervisque lateralibus 7-9 elcvatis sparse 

 sericea, interdum paulo glandulosa facie glabra, venulis tantum pro parte promi- 

 nulis, 5-7.5 cm. longa et (3-)3.5-6 cm. lata; petioli 0.5-1.5 cm. longi, sparse sericei 

 et interdum glanduloso-hirti; stipulae oblongae, obtusae, integrae, extus' paulo 

 sericeae, margine villosulae, ad 8 mm. longae. Amenta florifera ignota; fructifera 

 pedunculis hirtello-villosis et plerisque glanduloso-hirtis 1-1.5 cm. longis suffulta. 

 Fructus 2-4 aggregati, 2-3 cm. longi; involucra apice nuci.s subito valdc contracta 

 in tubum nuce subaequilongum apice inciso lobatum jiroducta, ut in var. mand- 

 shurica griseo- velutina et praesertim circum nucem albido- v. fusco-setosa; nuces 

 (an satis maturae ?) ovato-rotundae, apice acutiusculae, minutissime puberulae 

 circiter 12 mm. longae et fere aequilatae. 



JAPAN. Hokkaido: prov. Oshima, Shiribeshi-san, thickets, abundant, up 

 to alt. 700 m., July 27, 1914, E. H. Wilson (No. 7268, t>T»e; fruits apparently 

 not yet fully ripe); Hakodate, 1861, C. Maximowicz (a very similar fruiting 



