A frond is bipinnate (Latin, bis, twice) when the lobes of the pinnæ extend to the midvein as in the royal fern (Fig. 2).
Pinna, a primary division with its leaflets of a bipinnate or tripinnate leaf.
These appendages in the Zoantharia never present the bipinnate arrangement which is observable in the Alcyonaria.
Stem and branches pinnate or bipinnate, the pinnae and pinnules alternate.
Pinnule, a secondary division of a bipinnate or tripinnate leaf, 66.
Fronds smooth, two to ten inches long, lanceolate, bipinnate.
Name said to be formed from bipinnula, referring to the bipinnate leaves.
Its leaves are hairy, bipinnate, with lobed and toothed, ovate or oblong leaflets.
In all botanical works the fronds are incorrectly said to be bipinnate.
The latter are compound, bipinnate (Fig. 7), and have fifty pairs of leaflets, which are linear and obtuse and of a grayish green.