@article {Bongarten:1 March 1982:0015-749X:129,
	author = "Bongarten, Bruce C.",
	author = "Hanover, James W.",
	title = "Hybridization Among White, Red, Blue, and White X Blue Spruces",
	journal = "Forest Science",
	volume = "28",
	year = "1 March 1982",
	abstract = "Crosses between white spruce (Picea glauca), red spruce (P. rubens), blue spruce (P. pungens), and (P. glauca x P. pungens) from several seed and pollen parents were made during 1974-76. The seeds were grown for 6 months with the aid of continuous illumination and several characters were measured to verify the hybridity of the seedlings. Hybrids of rubens with glauca and (glauca x pungens) were verified on the basis of differences in needle color, number of needle serrations, and concentrations of 3-carene, limonene, and &#946;-pinene in the cortical oleoresin. P. glauca x pungens hybrids were verified with more difficulty by a combination of needle curvature and 3-carene concentration. The backcrosses, (glauca x pungens) xglauca and (glauca x pungens) x pungens, were differentiated from each other by growth rate, needle curvature, and concentrations of 3-carene and &#946;-pinene. For most traits, putative hybrids were intermediate to their parents. However, F<SUB>2</SUB> glauca x pungens hybrids were severely stunted, possibly owing to consanguinity of the parents. Forest Sci. 28:129-134.",
	pages = "129-134(6)",
	url = "http://www.ingentaconnect.com/content/saf/fs/1982/00000028/00000001/art00019"
}