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Document Type

Research

Abstract

Sonchus arvensis var. glabrescens Wimm. and Graeb. is at present sparsely distributed in Iowa. The patches are often miles apart. In a number of isolated colonies observed in Clay, Palo Alto, Osceola, Dickinson, Story and Hamilton counties seeds are seldom or never found from July to September. Some tests made relative to the fruiting habits of the Smooth Sow Thistle produced the following results. Self or close pollinated flowers from the same head or from heads in the same colony produced no fruits ("seeds"). Flowers cross-pollinated by brushing with flowers from a distant colony produced almost as many seeds as there were flowers in the head. The heads average about 200 flowers each.

Publication Date

1937

Journal Title

Proceedings of the Iowa Academy of Science

Volume

44

Issue

1

First Page

105

Last Page

105

Copyright

© Copyright 1937 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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