Anatomical studies of carex cuchumatanensis carex decidua and carex hermannii cyperaceae and comparisons with north american taxa of the carex acuta complex

Standley, L.A.

Brittonia 39(1): 11-19


ISSN/ISBN: 0007-196X
Accession: 004746807

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Foliar anatomy and micromorphology of perigynia and achenes were investigated for three taxa of the Carex acuta complex of sect. Phacocystis Dumort. in Middle and South America. Anatomical characters appear to be conservative, and show little variation among C. cuchumatanensis Standl. and Steyerm., C. decidua F. Boott, and C. hermannii Cochrane. Leaves of all species are amphistomatous, with stomates and papillae on both epidermal surfaces, and have a single layer of bulliform cells but differ in the number of vascular bundles. Perigynia have epidermal cells with thin, convex, outer walls that are collapsed in dried specimens, and epidermal cells of achenes each have a single, rounded, nodulose silica-body with a basal platform. Anatomical data are useful in resolving the affinities among these species, and show that they are anatomically indistinguishable from C. lenticularis Michx. These four New World endemics differ substantially from C. nigra (L.) Reichard.