Rubber and resin content of native and introduced plants of Canada [book]

William Harold Minshall
1900 unpublished
RESULTS Acetone and benzene extracts from the preliminary short-time analyses together with the collection locality, date of collection, and name of collector are given in Table 1 . The plant species are listed alphabetically. If more than one collection was made for a species these collections are arranged (a) geographically by provinces from west to east and (b) within each province by date of collection from early season to late. Periodic collections of Apocynum and Asclepias, which were
more » ... ias, which were made in the same -3-localities, are grouped together in the table and the collection localities are deleted for all but the first sample. Accession numbers are included with the locality for the material that was established in plots at Ottawa. The great majority of plants analyzed had benzene extracts of less than one percent, indicating that they contained little or no rubber. Among the species with more than two percent were Apocynum androsaemifolium 2.1%, Asclepias syriaca 2.5%, A. sullivantii 2.1%, Euonymus europaea 3.2%, E. maackii 6.1%, and E. yedoensis 2.7%. In addition species of the following genera had benzene extracts between one and two percent: Apocynum, Asclepias, Eucommia, Euonymus, Euphorbia, Lonicera, Parthenium, Solidago and Tanacetum. Rubber apparently is not stored uniformly in the roots and shoots of all plants. In species of Apocynum, Asclepias, Lonicera, and Solidago the leaves had higher benzene extracts than did the stems or roots. In species of Euonymus, however, the highest benzene extract was in the bark, while in Euphorbia corollate it was in the roots, and in Parthenium argentatum it was in the stems. Analyses of the periodic collections from the same locality of Apocynum androsaemifolium and Asclepias syriaca indicate that the rubber content of the leaves increased with the advancing season. Large acetone extracts were obtained from some of the samples, for example Lonicera tatarica 47%, Rhus typhina 45%, R. glabra 35%, Lonicera ruprechtiana 39%, L. amoena 35%, Euonymus japonica 34%, Apocynum androsaemifolium 33%, and Betula papyrifera 30%. In addition species of the genera Acer,
doi:10.5962/bhl.title.56825 fatcat:m7lxy5ghcvh4vagc3etbvz5s5a