Phytologia (Apnl 1995) 78(4) 217-243 NEW SPECIES AND VARIETIES OF CONIFERS FROM MEXICO Dr. Zsolt Debreczy & Dr. Istvdn R^z International Dendrological Research Institute, Inc. (I. D.R.I.) (5 North Meadow Road. Medfield. Massachusetts 02052 U.S.A.) Botanical Department of the Hunganan Natural History Museum (H-1476 Budapest, P.O. Box 222, HUNGARY) ABSTRACT Four new species and six new vaneties are described here; three species and two vaneties of Abies, one species and three vaneties of Pinus, and one new vanety of Pseudolsuga. Within the genus Abies only one Mexican species was known with consistently more than two resin canals, and five having cones with enclosed bracts. The authors here report two additional (new) species, one from the state of Hidalgo and one from Oaxaca, with more than two resin canals and, including these, altogether three spjecies with enclosed bracts. A new vanety of Abies guaiemalensLs Rehd. was found in Guerrero. Abies lowiana {Gord.) A. Murr., often unreasonably neglected as a separate species and included in A. concolor (Gord. & Glend.) Lind. ex Hild. as its vanety, is herein reported to be represented by a new vanety in the state of Chihuahua. A distinct species of Pinus, discovered in Sonora, with five needles in a fascicle, stout branches, and strong scales such as in P. michoacana Mart., but with cones clearly placing this species in "Pseudostrobus" (like P. estevezii [Mart.] Perry or P. nubicola Perry). This new pine may play a key role in understanding the process of divergence of "Montezumae" and "Pseudostrobus" pines. A vanety of the new species was also found by the authors in the state of Sinaloa. The southernmost localities of the genus Pseudolsuga so far were known from the states of "Hidalgo and Puebla. The authors report on the species, as a new vanety, further south, in Oaxaca A new variety of Pinus lawsonii Roezl ex Gord. and one of P. oaxacana (Mart.) Mirov is also reported from the latter area KEY WORDS: New taxa, Coniferae, Mexico, Abies, Pinus, Pseudolsuga, Hidalgo, Guerrero, Oaxaca, Sonora, Sinaloa NOTE: the species and vaneties descnbed here have been mentioned, along with a concise descnption and photographs, in the No. 6 issue of the NewsBnef of the International Dendrological Research Institute, Inc. (I.D.R.I.), Sep. 1994. The taxa ''Abies A-E" are those listed in this article under numbers 1-5, ''Pinus A-D" are those under 6-9, and "Pseudolsuga A" is under 10 in the list below (discussion). For information contact I.D.R.I., as given above. 217
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