11. It has simple linear flat leaves that have an pinnatifid shape and are long and wide. 12. The small leaves ( 0.75 inch ) are irregular and pinnatifid , giving the plant an airy appearance. 13. Leaves alternate and variable in shape, simple or pinnatifid , the leaf margins wavy . 12 to 20 cm long. 14. The leaf blades are usually pinnate in cutting rarely pinnatifid or bipinnatifid, bearing free veins which lack hydathodes at their terminus. 15. It is a short-lived plant often treated as leaves are bi-pinnatifid ( = finely divided ) and downy beneath. 16. There are typically no more than three pairs of pinnae, and sometimes even the most basal part of the leaf is pinnatifid . 17. The bottom half, more or less, of the blade is cut into pinnae, while the upper half is merely pinnatifid . 18. The leaves are usually lobed or pinnatifid ( i . e . consisting of several not entirely separate leaflets ), or much divided. 19. Blades are either entirely pinnatifid ( lobed but not completely cut ), or cut to form a single pair of pinnae at the base. 20. The inflorescence have 3 leaf-like bracts similar in appearance to the basal leaves but simple and greatly reduced in size, pinnatifid in shape.
