The elements of botany for The elements of botany for beginners and for schools elementsofbotany00grayuoft Year: [1887] SECTION 7.] ORDINARY LEAVES. 59 becomes thrice pinnate, or tripinnate, as iu many Acacias. The first divi- sions are called Pinna ; the others, Pinnules ; and the last, or little blades themselves, Leaflets. 155. So the palmate leaf, if again compounded in the same way, be- comes twice palmate^ or, as we say when the divisions are in threes, twice ternate (in Latin form biter- nate) ; if a third time compounded, thrice ternate or triternate. But if the division goes still fu
The elements of botany for The elements of botany for beginners and for schools elementsofbotany00grayuoft Year: [1887] SECTION 7.] ORDINARY LEAVES. 59 becomes thrice pinnate, or tripinnate, as iu many Acacias. The first divi- sions are called Pinna ; the others, Pinnules ; and the last, or little blades themselves, Leaflets. 155. So the palmate leaf, if again compounded in the same way, be- comes twice palmate^ or, as we say when the divisions are in threes, twice ternate (in Latin form biter- nate) ; if a third time compounded, thrice ternate or triternate. But if the division goes still further, or if the degree is variable, we ^^ simjily say that the leaf is decom- pound ; either palmately or pin- nately decompound, as the case may be. Thus, Fig. 161 repre- sents a four times ternately com- pound (in other words a ternately decompound) leaf of a common Meadow Rue. 156. When the botanist, iu de- scribing leaves, wishes to express the number of the leaflets, he may use terms like these: â Unifoliolate, for a compound leaf of a single leaflet; from the Latin unum, one, and foliolum, leaflet. Bifoliolate, of two leaflets, from the Latin bis, twice, aiid/oliolum, leaflet. Trifoliolate (or ternats), of three leaf- lets, as the Clover; and so on. Palmateli/ bifoliolate, trifoliolate, quadrifoliate, plurifoliolate (of several leafleis), etc.: or else Pinnately bi-, tri-, quadri-, or pluri- foliolate (that is, of two, three, four, five, or several leaflets), as the case may be: ihese are terse ways of de- noting in single phrases both the num- ber of leaflets and the kind of com- pounding. L57. Of foliage-leaves having certain peculiarities in structure, the following may be noted : ââ Fig. 160. A twice-pinnate (abruptly) leaf oi the Honey-Locust Fig. 161. Ternately decompound leaf of Mwddow Rue. ICO
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