Milkweed, common

Bedstraw dyed common milkweed Indian hemp, charred 10,20 and 30 minutes Indian hemp fiber mineralized for 6 mos. Etowah Mound C 840, partially mineralized bast... 

Iron oxide painted common milkweed with beef tallow binder Rabbit hair, charred 10,20, 35 and 45 min. Cuprite Seip 5, charred bast, red deposits... 

Iron oxide painted rabbit hair with albumin binder Bedstraw dyed common milkweed, charred 20 min Malachite (spectrum from IRUG) Seip 36, charred bast, red cast, Fe... 

Iron oxide painted rabbit hair with beef tallow binder Iron oxide painted common milkweed, Charred 20 min. Copper hydroxide Seip 32, copper painted , green stains, composite layers... 

Common milkweed Small if any, softwood type Small Small... 

NOTE Small indicates that the quantity of material that is present is relatively small compared to the remainder of the spectrum. Significant quantity indicates obvious amounts of the component. Where peaks are very outstanding notation is made of distinct sharp peaks. Small quantity of oxalate in common milkweed reflects that very little oxalate was observed in IR spectra of the untreated material but chaned milkweed displayed oxalate. 

In some cases new information may be revealed as a result of charring. The infrared spectrum of charred common milkweed (Figure 10) displays oxalates that are not as apparent in the uncharred sample. In some cases of charred fibers, the spectrum can be said to be cellulosic, but further distinction of the organic structure based on lignins cannot be made. 

A number of plants and some trees contain a white, milky liquid that is released when the stem or bark is cut. The liquid is called a latex from the Latin meaning liquid. Common sources include dandelions, milkweed, goldenrod, and potted rubber plants. Rubber trees, from which substantial quantities of latex can be harvested, grow in some tropical areas of the world. A major constituent of this latex is a homopolymer of isoprene (2-methyl-1,3-butadiene), called polyisoprene. Polyisoprene, as well as a number of other elastomers, has a carbon-carbon double bond in every repeat unit. The properties of polyisoprene are the result of the presence of these double bonds. Just as stereochemistry plays a critical role in both proteins and polysaccharides, we will see its importance here. 

Smith RA, Mooney KA, Agrawal AA (2008) Coexistence of three specialist aphids on common milkweed, Asclepias syriaca. Ecology 89 2187-2196 Stadler B, Dixon AFG (2005) Ecology and evolution of aphid-ant interactions. Annu Rev Ecol Evol Systemat 36 345-372... 

Plants that can cause CNS stimulation include larkspur, locoweed, lupine, water hemlock, and fi-tweed. Common plants that produce CNS depression are black locust, bracken fern, horsetail, milkweed. 

Malcolm, S. B., B. J. Cockrell, and L. P. Brower, Cardenolide fingerprint of monarch butterflies reared on common milkweed, Asclepias syriaca L., J. Chem. Ecol., 15, 819-853 (1989). 

---