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Nutlet sculpturing in Scutellaria sect. Resinosa (Lamiaceae) and its taxonomic utility

Billie L. Turner and Piero G. Delprete
Plant Systematics and Evolution
Vol. 199, No. 1/2 (1996), pp. 109-120
Published by: Springer
Stable URL: http://www.jstor.org/stable/23643002
Page Count: 12
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Nutlet sculpturing in Scutellaria sect. Resinosa (Lamiaceae) and its taxonomic utility
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Abstract

Nutlet sculpturing of 22 taxa of Scutellaria sect. Resinosa, representing 18 of its 19 species, and the monotypic genus Salazaria was studied by scanning electron microscopy (SEM). The nutlets of sect. Resinosa, while remarkably variable among themselves, differed from hypothetically closely related sections in lacking circumferential banding and sessile glands. Species could be grouped by surface sculpturing into seemingly meaningful phenetic clusters. Scutellaria potosina var. platyphylla was sufficiently distinct micromorphically so as to be elevated to specific status as Scutellaria platyphylla comb. and stat. nov. The significance of nutlet microcharacters within sect. Resinosa is discussed, especially as compared to closely related sections. The genus Salazaria had nutlet sculpturing quite different from all taxa belonging to sect. Resinosa.

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