. Trees of Texas; an illustrated manual of the native and introduced trees of the state . 1. Acuminate. Acute. 3. Obtuse. 4. Truncate. 5. Retuse. Obcordate. 8. Cuspidate. 9. Mucronate. Emar- tion of the genus is given. Here again the student should checkeach statement in the descripticm, to see if it tallies with the speci-men at hand. If cori-ect, the key to the genus must next be con-sulted. Here the choice goes to flowers opening in the springbefore the leaves. Branches not corky winged. Leavessmooth or somewhat roughened above, inner bark not mucilagin- 22 Bulletin of the Un
. Trees of Texas; an illustrated manual of the native and introduced trees of the state . 1. Acuminate. Acute. 3. Obtuse. 4. Truncate. 5. Retuse. Obcordate. 8. Cuspidate. 9. Mucronate. Emar- tion of the genus is given. Here again the student should checkeach statement in the descripticm, to see if it tallies with the speci-men at hand. If cori-ect, the key to the genus must next be con-sulted. Here the choice goes to flowers opening in the springbefore the leaves. Branches not corky winged. Leavessmooth or somewhat roughened above, inner bark not mucilagin- 22 Bulletin of the University of Texas ous. The determination is then checked by turning to the de-scription of the species and consulting* the illustration. If thepine is taken, the first choice goes to leaves needle scale or awl- IV. Iiobed Simple Pinnately:Paimateiy: shaped, etc., which leads to the family Pinaeeae. Here thedecision is between leaves all needle-shaped and leaves scale-like and appressed to the stem, or some of them awl-shaped,spreading. If the leaves are needle-shaped and borne in clus-ters of two to five, the species goes to the genus Pinus. It is believed that practice in the use of the key will soonenable one to locate the family, genus, and species with almostcertain accuracy. It must be borne in mind that accuracy ofobservation is necessarv to its successful use. The Trees of Texas v. Compound Iieaves. 2;^
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