Category: A

With an uninterrupted central vascular cylinder with radiating ribs, and without pith.  

Uninterrupted central vascular cylinder with radiating ribs.  

(Of flowers) regular, radially symmetric. Having radially arranged floral segments which are more or less equal in size and shape. Radially symmetrical, that is capable of section by straight boundaries into three or more similar divisions.  

With three or more prominent veins from near the base of the leaf, running towards the margin (and sometimes reaching it).  

In branching, when the branches near the apex of the plant are the most developed; With new organs developing on or near the apex of existing organs.  

(Of sporangia) resembling the arrangement in Acrostichum, with the lower/abaxial frond surface completely covered with sporangia.  

The first sprout of a germinating seed.  

(In ferns) facing towards the apex of the frond. Facing towards the tip of the leaf.  

In climbing ferns, the mature fronds formed at some distance from the ground.  

In the direction of the apex.