Its broad pinnate tropical leaf was pleasant though strange to look on.
In Lathyrus Aphaca and some other plants the true pinnate leaves are abortive, the petiole forms a tendril, and the stipules alone are developed, perform ing the office of leaves.
When a pinnate leaf ends in a pair of pinnae it is equally or abruptly pinnate (paripinnate); when there is a single terminal leaflet (fig.
Sphenozamites, chiefly from French localities, which are referred to 1 fronds, which therg is good reason to refer to the Cycadales in the Cycads because of their similarity to the pinnate fronds of Upper Triassic, Rhaetic, Jurassic and Wealden rocks in India, modern Cycadaceae.
The leaves, at the base of which are two large stipulelike outgrowths, have a thick leaf-stalk, and are simple or simply pinnate in Danaea, pinnate in Archangiopteris, bito tri-pinnate in Marattia and Angiopteris, and digitately lobed in Kaulfussia.
A leaf with only a single midrib is said to be unicostate and the venation is described as pinnate or feather-veined.
Typically Marattiaceous sori, consisting of exannulate sporangia united to form synangia, are frequent, and are almost always found on fronds with the character of Pecopteris, large, repeatedly pinnate leaves, resembling those of Cyatheaceae or some species of Nephrodium.
The leaves are simple and linear in Pilularia, but in Marsilia bear a pinnate four-lobed lamina.
P. Jaegeri), represented by large pinnate fronds not unlike those of existing species of Zamia, some Equisetaceous plants and numerous Ferns which may be referred to such families as Gleicheniaceae, Dipteridinae and Matonineae.
They are all trees, usually of large size, with alternate stalked, unequally pinnate leaves, and abounding in an aromatic resinous juice.