Cornus florida L. - Cornaceae - (eastern) flowering dogwood, common white dogwood, American boxwood, (Amerikanischer) Blumen-Hartriegel, Blüten-Hartriegel

Deciduous tree (one of America's most popular ornamental trees), up to 10m high, native to eastern North America; leaves are opposite, simple, ovate.
„The flowers are individually small and inconspicuous, with four greenish-yellow bracts 4mm (0.16 in) long. Around 20 flowers are produced in a dense, rounded, umbel-shaped inflorescence, or flower-head, 1-2cm (0.39-0.79 in) in diameter. The flower-head is surrounded by four conspicuous large white, pink or red „petals“ (actually bracts), each bract 3cm (1.2 in) long and 2.5cm (0.98 in) broad, rounded, and often with a distinct notch at the apex.“

„A six-component blend containing ethyl acetate (54.9%), 3-methylbutan-1-ol (27.5%), isoamyl acetate (0.9%), dimethyl trisulfide (1.9%), 1-octen-3-ol (9.1%), and β-caryophyllene (5.8%) was identified from flowering dogwood fruit…“
[Identification of host fruit volatiles from flowering dogwood (Cornus florida) attractive to dogwood-origin Rhagoletis pomonella flies. Nojima, S., Linn Jr, C., Roelofs, W., Journal of chemical ecology, Vol.29(10), 2003, 2347-2357]

„Six principal volatile compounds were detected from the flowers of the cultivar ‘World’s Fair’ with 3-formylpyridine as the most abundant constituent. Subsequent headspace analyses performed using inflorescences without bracts or floral pedicels alone indicated that 3-formylpyridine, E-β-ocimene, S-linalool, and ketoisophorone were mainly emitted from inflorescences. Experiments were also conducted to determine whether volatile emissions differed across time and between different cultivars of flowering dogwood. When volatile emission was analyzed for 48 h using 12 h light/dark cycles, the emission of several volatile compounds displayed diurnal patterns. Finally, whereas florets in inflorescences of four different dogwood cultivars emitted similar levels of the six principal floral volatile chemicals, ‘Cherokee Brave’ flowers alone yielded 4-methoxybenzaldehyde and germacrene-D.“
[Emission of volatile chemicals from flowering dogwood (Cornus florida L.) flowers. Zhuang, X., Klingeman, W. E., Hu, J., Chen, F., Journal of agricultural and food chemistry, Vol.56(20), 2008, 9570-9574]

Carson,J., Colen,J.H., Illustrations of medical botany, vol.1, t.42 (1847)

Cornus florida, 3.Botanischer Garten der Universität Wien (HBV) 2017; © Rolf Marschner,

cornus_florida_l.txt · Zuletzt geändert: 2017/10/23 16:47 von andreas