Tas. 8770. 
ALNUS rFrrMa, var. Yasna. 
Japan. 
CUPULIFERAE. Tribe BETULEAR. 
Aunus, Gaertn. ; Benth, et Hook. f. Gen. Plant. vol. iii. p. 404. 
Alnus firma, Sieb, et Zuec., var. Yasha, Winkler in Engl. Pflanzenr.- 
Betulaceae, p. 104; Elwes & Henry, Trees of Gt. Brit. and Ireland, 
vol. iv. pp. 9538; Bean, Trees and Shrubs, vol. i. p. 180; a var. typica 
ramulis pubescentibus, foliis angustioribus cum nervis paucioribus 
(utrinque 10-16), strobilis saepe 2 vel 8 minoribus recedit. 
Fruter vel arbor parva ad 9 m. alta. Rami patentes, longissimi, graciles, 
ramulis lenticellis numerosis conspicuis instructis primo pubescentibus 
demum glabrescentibus. Gemmae sessiles, elongato-conicae. Folia 
petiolata, lanceolato-ovata, apice acuta vel breviter acuminata, basi 
rotundata et saepe leviter inaequalia, calloso-serrulata, supra glabra, infra 
ad nervos adpresse pubescentia, 6-8 cm. longa, basin versus 2°5-3 em. 
lata; nervi laterales utrinque 10-16, conspicui, subparalleli, supra cum 
costa impressi, infra elevati; petiolus saepe 10-12 mm. longus, pubescens. 
Amenta mascula solitaria vel geminata, terminalia vel subterminalia, 
cylindrica, 5-7 cm. longa. Bracteae peltatae, 2 mm. longae, 2°5 mm. 
latae, glandulosae, ciliatae, apice brunneae, membranaceae. Bracteolae 2, 
minutae, ad bracteam arcte adpressae. Perianthiwm 4-lobum;_ lobi 
minuti, glandulis paucis stipitatis luteis instructi. Stamina saepissime 4. 
Amenta femina (strobili) 2-5 in racemum erectum terminalem disposita, 
vere enascentia, florifera ellipsoidea, 6-8 mm. longa, bracteis crassis ovatis, 
fructifera solitaria vel 2, raro plura, ovoideo-ellipsoidea, 1*7-2 cm. longa, 
1°3-1'5 em. lata. Pedunculi ad 2 em. longi. Nuculae ala membranacea 
inclusa saepissime oblique obovatae, emarginatae, 8-4 mm. longae, apice 
2-2°5 mm. latae.—A. Yasha, Matsumura in Journ. Coll. Sci. Tokyo, 
vol. xvi. art. 5, p. 4, t. 2; C. K. Schneider, Ill. Handb. Laubholzk. vol. i. 
p. 128. A. firma, Sieb. et Zuee. in Abhandl. Acad. Muench. vol. iv. pars By 
p. 2830, partim ; Regel, Monogr. Betulac. p. 84, t. 15, figs. 1-9, partim ; 
Miq. in Ann. Mus. Bot. Lugd.-Bat. vol. ii. p. 137, partim ; Franch. et 
Savat. Enum. Pl. Jap. vol. i. p. 457, partim. A. firma, var. typica, Regel 
in Bull. Soe. Nat. Mose. vol. xxxviii. pars 2, p. 423 et in DC. Prodr. vol. xvi. 
pars 2, p. 183, partim. A. firma, var. hirtella, Franch. et Savat. ].c. vol. i. 
p. 457 et vol. ii. p. 502, partim. A. Harinoki, Sieb. in Verh. Gen. Bat. 
vol, xii. p. 25. Betula Alnus, Thunb. Fl. Jap. p. 76, excl. syn. Alnaster 
firma, Schweinf. ex Winkler, l.c. p. 104.—S. A. Skan. 
Alnus jirma is a variable species which is widely dis- 
tributed in Japan, and with A. Alnobetula, Hartig — 
Juty-Sepremper, 1918, 
