Artificial key to the weed seeds found in commercial seeds in Illinois and adjoining states . In Charge of Thesis Head of Department Recommendation concurred in* Committeeon Final Examination* *Required for doctors degree but not for masters 408290 Table of Contents IntroductionThe KeyDescriptionsBibliographyIllustrations Pages1-2 3-4: 5-1112 - 14 Introduction The purpose of this work is to aid one to determine theweed seeds and seed-like-fruits frequently found in commercialgrains of Illinois and adjoining states. The term, seed, in thiskey, is used to mean a ripened ovule. It is not used to
Artificial key to the weed seeds found in commercial seeds in Illinois and adjoining states . In Charge of Thesis Head of Department Recommendation concurred in* Committeeon Final Examination* *Required for doctors degree but not for masters 408290 Table of Contents IntroductionThe KeyDescriptionsBibliographyIllustrations Pages1-2 3-4: 5-1112 - 14 Introduction The purpose of this work is to aid one to determine theweed seeds and seed-like-fruits frequently found in commercialgrains of Illinois and adjoining states. The term, seed, in thiskey, is used to mean a ripened ovule. It is not used to includefruits such as an achene and caryopsis. If tne structure is afruit, it is named as such. Since the terms seed, fruit, achene, caryopsis, nut,nutlet, utricle, spike, spikelet and involucre are used, it isnecessary to define them. A seed is a ripened ovule; , wildmustard. A fruit is a ripened ovary with its attachments; ,common ragweed. An achene is a seed-like indehiscent fruit inwhich the seed is not firmly united with the wall of the ovary;, curled dock. A caryopsis isartificialkeytow00gant
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