BARTLETT. — NOTES ON MEXICAN ALDERS. 609 
V. NOTES ON MEXICAN AND CENTRAL AMERICAN 
ERS. 
By Harutey Harris Bartierr. 
Anus acuminata HBK. A. acuminata a genuina Regel, Monog. 
89 (1861), A. jorullensis var. acuminata (HBK.) Ktze. Rey. Gen. ii. 
638 (1891), not A. acuminata Mirb. Mém. Mus. Par. xiv. 464, t. 22 
(1827), not A. acuminata a genuina Hemsl. Biol. Cent.-Am. Bot. iii. 
165 (1883), not A. acuminata Sarg. Silva ix. 79, t. 457 (1896), not A, - 
Jorullensis var. » acuminata Winkl. Pflanzenreich, iv. 61, 127 (1904), 
not A. acuminata Fern. Proc. Am. Acad. xl. 25 (1904). Here are 
placed Seemann, no. 942, Loja, Ecuador, and, with considerable doubt, 
Tonduz, no. 11,680, ‘* Bords des riviéres au Copey,” Costa Rica. The 
latter specimen is much more ferrugineous than the former and forms 
a transition to what has been called 
ALNUS ACUMINATA var. FERRUGINEA (HBK.) Regel. ?? Alnus ferru- 
ginea HBK. A. ferruginea Fern. Proc. Am. Acad. xl. 27 (1904) pro 
parte. This name may be provisionally accepted for Tuerckheim, 
no. 351, Coban, Department of Alta Verapaz, Guatemala, which seems 
to be a very ferrugineous extreme of the plant here called A. acuminata. 
— pubescence is very dense, and is persistent on all but the oldest 
eaves. 
ALNus arauta (Schlecht.) Spach. Betula arguta Schlecht. Alnus 
arguta Spach a genuina Regel, Monog. 93 (1861). In its typical 
form this species is accepted as interpreted by Professor Fernald. It 
presents, however, two variations which seem worthy of recognition. 
Neither of them appears to fall into any of Regel’s four varieties. His 
var. genuina is here taken up as the type form of the species. Var. 
Benthami is so inadequately characterized as to be unrecognizable with- 
out access to the type. Moreover it came from Zacualtipan, to the 
north of the known range of either of the two varieties here pro 
Var. ovata was based upon material from three Mexican localities, 
and one Peruvian locality, but since Regel cited as a synonym A. Mir- 
belii var. Grisb. in Lechl. Pl. Peruy. the type is definitely fixed as the 
Peruvian element, which it is almost inconceivable should be the same 
as the Mexican. Var. punctata was purely South American. 
VOL, XLIV. — 39 
