BARTLETT. — NOTES ON MEXICAN ALDERS. 611 



can element, in the synonymy of A. arguta (Schlecht.) Spach var. 

 cuprea Bartlett. 



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 cm. longum decur- 

 rentia ; nervis utrinque 9-10 ; petiolis anguste canaliculatis exigue 

 albido-pubescentibus. Amenta 9 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, E. Palmer, no. 

 965 (type, in hb. Gray). Readily distinguished from the typical form 

 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. 



A. Mirbelii 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 $ 4-6 usque ad 13 cm. longa fere 

 sessilia vel longipedunculata. Amenta 9 in uno ramulo 3-4 ovoidea 

 ca. 2.5 cm. longa 1.4 cm. crassa maturitate plerumque ficte sessilia 



