Open AccessLeaf anatomy of Raoulia Hook.f. (Compositae, Gnaphalieae)
Author(s) -
BREITWIESER ILSE,
WARD JOSEPHINE M.
Publication year - 1998
Publication title -
botanical journal of the linnean society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.872
H-Index - 68
eISSN - 1095-8339
pISSN - 0024-4074
DOI - 10.1111/j.1095-8339.1998.tb02528.x
Subject(s) - biology , lamina , subgenus , anatomy , botany , hook , genus , comparative anatomy , cuticle (hair) , plant anatomy , plant morphology , structural engineering , engineering
Leaf anatomy is compared for all species of Raoulia. The species are tabulated according to their lamina structure. Noteworthy anatomical features are lamina type and grade of differentiation, stomatal position, epidermal and cuticle thickness, shape of mesophyll cells, presence or absence of central clear cells, sclerenchyma caps, abaxial collenchyma and protruding midrib. It is shown that leaf anatomy data provide characters which are taxonomically useful in Raoulia. The main subgenera are supported except that the leaf anatomy of R. haastii is anomalous and that of R. youngii is typical of R. subg. Raoulia rather than R. subg. Psychrophyton. The leaf anatomy of R. petriensis is unique in the genus.