610 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Alnus arguta var. cuprea, n. var. Arbor aspectu inter formam 

 speciei typicam Alnumque glabratam Fern, media. Hamuli 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 nibil vel 

 minus quam ea formae typicae glauca, colore saepe cuprea, supra atriora. 

 Amenta ? pedunculata 9-11 mm. crassa ca. 2 cm. longa. — Oaxaca : 

 wet canon 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 

 .luquila to Nopala, alt. 1220-2135 m., Nelson, no. 2415; vicinity of 

 Cerro San Felipe, alt. 2900-3350 m., Nelson, no. 1154. Vera Cruz: 

 Orizaba, Bilimek, no. 404 ; Mt. Orizaba, alt. 1830-2440 m., Nelson, no. 

 296 ; Orizaba, Botteri, no. 191. 



Alnus arguta var. subsericea, n. var. A. ferruginea Fern. Proc. 

 Am. Acad. xl. 27 (1904) pro parte, non HBK. % A. rufescens Liebm. 

 ex Hemsl. Biol. Cent.-Am. Bot. iii. 165. Arbor ramulis griseo-brunneis, 

 junioribus ferrugineo-puberulis. Folia laminis late ovatis maximis 

 1 4 cm. longis 9 cm. latis, basi leviter cordatis vel rotundatis, apice acutis 

 vel breviter acuminatis, supra atroviridibus tenuiter sericeo-pilosis 

 demum glabratis, pilis longis rectis valde appressis, subtus molliter 

 glauco-pubescentibus, nervis rufescentibus in foliis maximis utrinque 16 ; 

 petiolis subferrugineo-pubescentibus saepissime quam 2 cm. brevioribus. 

 Gemmae parvae glutinosae puberulae pedicellis suis valde longiores nee 

 raro sessiles. Amenta 9 maturitate ca. 1 cm. crassa 3 cm. longa vel 

 multo breviora. Nuculae alis percoriaceis angustissime cinctae. — 

 Oaxaca : wet canon near the base of the summit ridge of the Sierra de 

 San Felipe, above the City of Oaxaca, Pringle, no. 10,252. This is 

 also the locality cited by Hemsley for A. rufescens Liebm. From the 

 name which Liebmann chose there can be little doubt that he had this 

 plant before him, for the only other reddish-leaved Alnus from the 

 same locality is so glabrous that Hemsley would certainly not have 

 placed it with A. acuminata var. ferruginea. Since Liebmann 's name 

 is a nomen nudum it does not seem at all desirable to take it up in 

 a changed category without having seen his type. To var. subsericea 

 may be referred Ghiesbreght, no. 160, from Chiapas, the plant upon 

 which Mr. Fernald's description of A. ferruginea is largely based. 



Alnus castaneaefolia Mirb. It is clear from the original plate 

 and characterization that this species can have no close affinity to the 

 Mexican plant cited by Hemsley under the name A. jorullensis HBK. 

 /3 castaneaefolia. The latter name should be placed, as to the Mexi- 



