Hair morphology and systematics ofPhysalis (Solanaceae) |
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Authors: | Almut Seithe Janet R. Sullivan |
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Affiliation: | (1) Mommenpesch 2, D-4150 Krefeld 29, Federal Republic of Germany;(2) Dept. Botany and Plant Pathology, University of New Hampshire, Durham, NH, USA |
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Abstract: | Hair morphology was exammed on developing seedlings and mature plants of ten species from five of seven series inPhysalis. The taxonomic importance of hair development and the distribution of hair types then was evaluated with respect to other comparative data. Two classes of hair types were observed, as found in earlier investigations ofSolanum andRhododendron. The first hair class comprises a sequence from unbranched hairs to dendroid-stelliform hairs. Hairs of this class show considerable variability among taxa in size, presence or absence of glandular tips, and presence and degree of branching, and so were useful in making taxonomic comparisons. The second hair class consists of short hairs, each tipped with a multicellular gland. This second hair class was not useful taxonomically because of its lack of variability in morphology and its often rare occurrence on a plant. The taxa studied exhibit distinctive trichome features which serve to distinguish series and, in some cases together with other data, provided new insight into previously enigmatic species relationships. |
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Keywords: | Angiosperms Solanaceae Physalis Hair morphology systematics hair development |
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