| an invader differentially affects leaf physiology of two natives across a gradient in diversity. | little is known about how exotics influence the ecophysiology of co-occurring native plants or how invader impact on plant physiology may be mediated by community diversity or resource levels. we measured the effect of the widespread invasive forb spotted knapweed (centaurea maculosa) on leaf traits (leaf dry matter content, specific leaf area, leaf nitrogen percentage, leaf c:n ratios, and delta13c as a proxy for water use efficiency) of two co-occurring native perennial grassland species, mona ... | 2008 | 18543627 |
| comparative screening of plant essential oils: phenylpropanoid moiety as basic core for antiplatelet activity. | essential oils extracted from different plants (anthemis nobilis l., artemisia dracunculus l., cannabis sativa l., cupressus sempervirens l., cymbopogon citratus (dc.) stapf., curcuma longa l., foeniculum vulgare l., hypericum perforatum l., hyssopus officinalis l., mentha spicata l., monarda didyma l., ocimum basilicum l., ocotea quixos kosterm., origanum vulgare l., pinus nigra j.f. arnold, pinus silvestris l., piper crassinervium kunth., rosmarinus officinalis l., salvia officinalis l., salvi ... | 2006 | 16274702 |
| effect of floral orifice width and shape on hummingbird-flower interactions. | nectar guides are common among insect-pollinated plants, yet are thought to be rare or absent among hummingbird-pollinated plants. we hypothesize that the lower lips and trumpet-shaped orifices of many hummingbird flowers act as nectar guides to direct hummingbirds to the flowers' nectar and orient the birds for pollination. to test this hypothesis we conducted laboratory experiments using flowers of monarda didyma (bee balm) and m. fistulosa (wild bergamot), which have orifice widths of about 4 ... | 1996 | 28307448 |
| the essential oil of monarda didyma l. (lamiaceae) exerts phytotoxic activity in vitro against various weed seed. | the chemical composition of the essential oil of the flowering aerial parts of monarda didyma l. cultivated in central italy was analyzed by gas chromatography/mass spectrometry (gc/ms). the major compounds of the oil were thymol (59.3%), p-cymene (10.3%), terpinolene (9.2%), δ-3-carene (4.4%), myrcene (3.7%), and camphene (3.4%). the essential oil was tested in vitro for its anti-germination activity against papaver rhoeas l., taraxacum officinale f. h. wigg., avena fatua l., raphanus sativus l ... | 2017 | 28157176 |