Saturday, February 20, 2016

[Botany • 2013] Three New Species of Impatiens L. from China and Vietnam: Preparation of Flowers and Morphology of Pollen and Seeds


Fig . 1. Habitat and habit photographs of the three new Impatiens species.
A. and BImpatiens aconitoides ( Y. M. Shui and W. H. Chen 32393 ). C. and D. Ipurpureifolia ( Y. M. Shui, W. H. Chen and J. S. Sheng 30583 ). E. and F. Irugata (E. from C. I Peng et al. 17528 , F. from Z. G. Yang 2009–01 ).
 F. was photographed by Z. G. Yang, and all the others photographed by Y. M. Shui  DOI: 10.1600/036364411X569615

Abstract
The genus Impatiens (Balsaminaceae) is one of the most difficult genera for making effective herbarium specimens because of its tender and complicated flowers. The preparation of flowers is always one of the most important steps in the collections of Impatiens. The present paper demonstrates a method to prepare flowering specimens of Impatiens in the field. Examples include three new species collected from the Sino-Vietnamese border, viz. Impatiens aconitoides, I. purpureifolia, and I. rugata . The related species I. laojunshanensis, I. apalophylla, and I. clavigera are also sampled using the same preparation method. As to the three new species, their pollen grains and seeds were observed by scanning electron microscopy. Impatiens aconitoides has 4-colpate pollen grains and ovoid seeds with protrusivetype of seed coat, whereas I. purpureifolia and I. rugata have 3-colpate grains and ellipsoidal seeds with reticulate-typed seed coat. Such an integrated approach to include detailed floral characters as well as pollen and seed characters is proposed when new taxa of Impatiens are described.

Keywords: Flower structure, Impatiens aconitoides, I. purpureifolia, I. rugata, pollen, seed


 Yu-Min Shui, Steven Janssens, Su-Hua Huang, Wen-Hong Chen and Zhi-Guo Yang. 2011. Three New Species of Impatiens L. from China and Vietnam: Preparation of Flowers and Morphology of Pollen and Seeds. Systematic Botany. 36(2):428-439. DOI: 10.1600/036364411X569615


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