BARTLETT. — NOTES ON MEXICAN ALDERS. 611 
can element, in the synonymy of A. arguta (Schlecht.) Spach var. 
cuprea Bartlett. 
og Alnus glabrata var. durangensis, n. var. Arbor trunco a cortice 
griseo sublevi tecto. Ramuli glabri ochracei modice graciles. Folia 
lanceolata 14 cm. longa infra mediam 6 cm. lata argute dentata, den- 
tibus subremote serratis, supra glabra olivaceo-viridia, subtus glauca 
glabra vel secus nervos minute pubescentia, exigue resinoso-punctata, 
apice longe acuminata, basi acuta in petiolum 1.5 em. longum decur- 
rentia ; nervis utrinque 9-10; petiolis anguste canaliculatis exigue 
albido-pubescentibus. Amenta ¢ ca. 4 maturitate cylindrica 2.5 cm. 
longa 8 mm. crassa, pedunculis saepe 6 mm. longis. Nuculae alis 
coriaceis anguste cinctae. — Collected in the vicinity of the City of 
Durango, State of Durango, April to November, 1896, . Palmer, no. 
965 (type, in hb. Gray). Readily distinguished from ypi rm 
of the species by the glaucous lower leaf-surface. 
ALNUS JoRULLENSIS HBK. This species has been seen from the 
States of Jalisco, Michoacan, Mexico, Hidalgo, and Oaxaca, the var. 
EXIGUA Fern. from the States of Guanajuato and Oaxaca. The mate- 
rial from Oaxaca, both of the species (Pringle, no. 10,248) and of the 
variety (Pringle, no. 10,249), is in young foliage, and future collections 
may show that it belongs elsewhere. 
ALNUS JORULLENSIS var. E. W. Nelson, no. 3661, collected near the 
Hacienda of Chaucol, Guatemala, has small sessile buds and cuneate 
leaves very much like those of A. jorullensis, but since the pistillate 
strobiles are unknown it seems better to leave the form undescribed 
rather than to risk adding another name to the involved synonymy of 
this species. ges 
A. Mirzettt Spach. The only material in American herbaria which 
answers to the description and plate of this species is Bang, no. 1893, 
- from Bolivia. Perhaps a sheet in the Gray Herbarium collected by 
Seemann and labelled by Dr. Gray “ And. Quitensis — Panama ” should 
be placed here also. 
Alnus ovalifolia, n. sp., A. acuminata Fern. pro parte, non HBK. 
Arbor ramulis junioribus brunneis glabris subangulatis. Gemmae 
glutinosae brevipedicellatae sparsim pubescentes vel glabratae. Folia 
ovalia subregulariter denticulata, apice basique rotundata obtusa vel 
raro acutiuscula, supra solum in nervis perexigue pilosa, subtus secus 
nervorum latera plus minusve pilosa, alias glabra, laminis 1.5~5.5 cm. 
latis 2.5-8.0 cm. longis ; petiolis 2-10 mm. longis, supra canaliculatis 
pilosis, subtus glabratis. Amenta g 4-6 usque ad 13 em. longa fere 
sessilia vel longipedunculata. Amenta ? in uno ramulo 3-4 ovoidea 
ca. 2.5 cm. longa 1.4 cm. crassa maturitate plerumque ficte sessilia 
