. Outlines of botany for the high school laboratory and classroom (based on Gray's Lessons in botany) Prepared at the request of the Botanical Dept. of Harvard University. Botany; Botany. â n-ith the petiole distinguishes this last case from a simple leaf. Id other species of these yeiiera the lateral leallels also are present. 184. The leaflets of a compound leaf may L>e either enlire (as iu Figs. 12i-126), or serrate, or lobed, cleft, parted, etc.; in fact, may pre- sent all the variations of simple leaves, and the same terms equally apply to them. 185. When the division is carried so far
. Outlines of botany for the high school laboratory and classroom (based on Gray's Lessons in botany) Prepared at the request of the Botanical Dept. of Harvard University. Botany; Botany. â n-ith the petiole distinguishes this last case from a simple leaf. Id other species of these yeiiera the lateral leallels also are present. 184. The leaflets of a compound leaf may L>e either enlire (as iu Figs. 12i-126), or serrate, or lobed, cleft, parted, etc.; in fact, may pre- sent all the variations of simple leaves, and the same terms equally apply to them. 185. When the division is carried so far as to separate what would be one leaflet into two, three, or several, the leaf becomes douhbj or twice com- pound, either pinnatehj or palmaleli/, as the case may be. For example, while the clustered leaves of the Honey Locust are shnpbj pinnale, that is, once pinnate, those on new shoots are bi/iiii- nute, or twice pinnule, as in Fig. 128. When these leaflets are again divided in the same way, the leaf becomes 'Jirice pinnate, or tripinnate, as in many Acacias. The first divisions are called pinnce; the others, pinnules; and the last, or little blades themselves, leaflets. 186. So the palmate leaf, if again compomided in the same way, becomes twice palmate, or, as we hwy when the divisions are iu threes, twice tcrnale (in Latin form Ijilcrnale); if a third tiuK.' compounded, llirice tcrnnlc or Irilcr- nale. But if the division goes still further, or if the degree is variable, we simply say that the leaf is dccompounil; either palmately or pinnatelj' decompound, as the case may be. Thus, Fig. 129 represents a four times ter- natelj^ conqionnd (in other "words a ternateh/ decompound^ leaf of a common JMeadow Hue. 187. AVIien the botanist, in describing 12;i. Ternaiely decom- loaves, wishes to express the number of tlifi pouutl leaf "^'f T i3 i 1 i Ti ii \r I T3 leaflets, he may use terms hke these: â Meadow Rue. .' , â Unifoliolale, for a compound leaf of a single
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