100 MISSOURI BOTANICAL GARDEN. 



Range, Montana to Nevada, New Mexico, South Central 

 Texas, and Northern Mexico* — Specimens examined from 

 the Rocky Mountains (Nuttall), Utah (Wasatch Mts., 

 Watson, May 1869, 214; Provost's Fork, Fremont, 1845, 

 305; City Creek Canon, Engelmann, 1880, Jones, 1893, 

 and 1880, 1437; Glenwood, Ward, 1875, 197; Parry, 1874, 

 29; Hooker & Gray, 1877), Nevada (Wheeler, 1872), 

 Arizona (Ash Creek, Rothrock, 1874, 303; Huachuca 

 Mts., Lemmon, 1882, 2650, Pringle, 1884; Sta. Catalina 

 Mts., Lemmon, 1881, 121), New Mexico (Mogollon Mts., 

 Greene, Apr. 25, 1881, Rusby, 1881, 69), Texas (Boerne, 

 Sargent, Mar. 27, 1887; Guadalupe Mts., Havard), Mexico 

 (Mt. Caracol, Palmer, Aug. 1880; San Luis Mts., Mearns, 

 1892, 71). 



When destitute of flowers, fruit, and even foliage, during 

 the winter season, the several species of maple occurring 

 in the United States may usually be recognized with cer- 

 tainty by one who is familiar with the characters afforded 

 by their bark, twigs, and buds ; and it is hoped that the 

 following winter synopsis, with the accompanying plates, 

 may prove useful to botanists who wish to familiarize 

 themselves with trees in their winter appearance, and to 

 teachers, who will find the study of twigs in winter a very 

 good means of developing the power of observation in 



pupils. 



Acer. — Trees or shrubs with rather slender nearly terete 

 twigs, somewhat four-sided minutely crenulate continuous 

 pith, low opposite v-shaped leaf scars mostly connected by 

 transverse lines, three evident bundle scars (or the upper- 

 most often divided into two, and the number increased to 

 seven or nine in macrophyllum) , and medium sized ovoid 

 or conical more or less stalked buds with their outer scales 

 ending in small scars where rudimentary blades have fallen 

 away. — The branches often end in dried remnants of the 

 inflorescence, or in a scar when they have fallen, the ter- 

 minal bud is often abortive in circinatum, and in the soft 



13 



