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

Issue

First Page

105

Last Page

105

Copyright

Language

File Format

application/pdf

Recommended Citation

Hayden, Ada (1937) "Notes on Seed Production in the Smooth Perennial Sow Thistle," Proceedings of the Iowa Academy of Science, 44(1), 105-105.
Available at: https://scholarworks.uni.edu/pias/vol44/iss1/20

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Notes on Seed Production in the Smooth Perennial Sow Thistle

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