610 PROCEEDINGS OF THE AMERICAN ACADEMY. 
Alnus arguta var. cuprea, n. var. Arbor aspectu inter formam — 
speciei typicam Alnumque glabratam Fern. media. i glabri 
juventate rubescentes aetate griseo-brunnei. Folia magnitudine valde 
variabilia, usque ad 8.5 cm. lata 14 cm. (petiolo excluso) longa, basi rotun- 
data vel leviter cordata, apice acuta vel acuminata, argute dupliciter 
vel irregulariter dentata, utrinque paene glabra, subtus vel nihil vel 
minus quam ea formae typicae glauca, colore saepe cuprea, supra atriora. 
Amenta ? pedunculata 9-11 mm. crassa ca, 2 em. longa. —Uaxaca: 
wet cafion near base of the summit ridge of the Sierra de San Felipe 
above the City of Oaxaca, alt. 2135 m., Pringle, no. 10,251; west slope 
of Mt. Zempoaltepec, alt. 2350-2440 m., Nelson, no. 599; road from 
Juquila to Nopala, alt. 1220-2135 m., Nelson, no. 2415; vicinity of 
Cerro San Felipe, alt. 2900-3350 m., Nelson, no. 1154. Vera Crum: 
Orizaba, Bilimek, no. 404; Mt. Orizaba, alt. 1830-2440 m., Nelson, 00. 
296 ; Orizaba, Botteri, no. 191. 
Alnus arguta var. subsericea, n. var. A. ferruginea Fern. Proo 
Am. Acad. xl. 27 (1904) pro parte, non HBK. 1 A. rufescens Liebm. 
ex Hemsl. Biol. Cent.-Am. Bot. iii. 165. Arbor ramulis griseo-brunnels, 
junioribus ferrugineo-puberulis. Folia laminis late ovatis maxis 
14 cm. longis 9 cm. latis, basi leviter cordatis vel rotundatis, apice acutis 
vel breviter acuminatis, supra atroviridibus tenuiter sericeo-puOss 
demum glabratis, pilis longis rectis valde appressis, subtus mollter 
glauco-pubescentibus, nervis rufescentibus in foliis maximis utrinque 16; 
petiolis subferrugineo-pul tik pissime quam 2 cm. brevioribus 
Gemmae parvae glutinosae puberulae pedicellis suis valde longiores net 
raro sessiles. Amenta 9 maturitate ca. 1 cm. crassa 3 Cl. longa 
multo breviora. Nuculae alis percoriaceis angustissime ane 
Oaxaca : wet cafion near the base of the summit ridge of the Siem ¢ 
San Felipe, above the City of Oaxaca, Pringle, no. 10,252. This 38 
placed it with A. acwminata var. ferruginea. Since Liebmann’s a 
is a nomen nudum it does not seem at all desirable to take 16 UP 
a changed category without having seen his type. ‘To var- 
may be referred Ghiesbreght, no. 160, from Chiapas, the plant upe® 
which Mr. Fernald’s description of A. ferruginec is largely 3 
ALNUS CASTANEAEFOLIA Mirb. It is clear from the original plate 
and characterization that this species can have no close affinity a 
Mexican plant cited by Hemsley under the name A. jorullensis Mexi- 
B castaneaefolia. The latter name should be placed, as to the 
