Pollen morphology in Lysipomia (Campanulaceae: Lobelioideae) and interpretation of shape artifacts

Kevin J. Price, Tina J. Ayers

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

The pollen of 32 species of Lysipomia was examined by light, scanning, and transmission electron microscopy. Two pollen types occur in the genus: 3-colporate and 6-colporate. The 3-colporate condition occurs in only two species, L. laciniata and L. pumila. The remaining 30 species are 6-colporate, a condition known from only one other genus in the Campanulaceae. Surface sculpturing among the species is uniformly striate. Pollen shape was highly variable within a single individual in comparisons of pollen gathered from herbarium specimens, FAA preserved material collected in the field, and fresh pollen from cultivated individuals grown from seed. Shape may change from oblate spheroidal to subprolate as a result of drying time and temperature, and should not be used as a morphological character in systematic studies if infraspecific variation is seen. When fresh or preserved pollen is not available, rehydrated pollen should be compared to reduce the possibility of inadvertent artifact production confounding the analysis of morphological data.

Original languageEnglish (US)
Pages (from-to)297-302
Number of pages6
JournalBrittonia
Volume60
Issue number3
DOIs
StatePublished - Sep 1 2008

Keywords

  • Campanulaceae
  • Lobelioideae
  • Lysipomia
  • Morphology
  • Pollen
  • SEM
  • TEM

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science

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