Larry, Thanks so much for the references. I was aware of Hersch-Green's work, but Tank's work is new to me. This puts a better perspective on the situation. I think the systematists should have been driven crazy by now with the breakup of Scrophulariacea. Incidentally, C. occidentalis survives about 1 year in my garden, but C. sulphurea loves the conditions. So much for high elevation paintbrush at 300 ft.
Dave Nelson _____ From: alpine-l-boun...@science.uu.nl [mailto:alpine-l-boun...@science.uu.nl] On Behalf Of Larry Wallace Sent: Thursday, January 20, 2011 10:42 AM To: Alpine-L, the Electronic Rock Garden Society,postings copyright by authors. Subject: Re: [Alpine-l] Penstemon Hybrid? Castilleja miniata, C. rhexiifolia, and C. sulphurea form hybrid swarms. Tangled Trio: http://www.amjbot.org/cgi/content/full/96/8/1519 This list them by sub-genus. Those in the same subgenus should cross. Between sub-genera there might be no seed or the seed may not grow or some may lack chlorophyll. Since they are hemi-parasitic white may not be a problem. http://www.phylodiversity.net/dtank/Tank_Lab/Publications_files/Syst%20Bot%2 02009%20Tank.pdf There are white Ericaeae. Monotropa which had been a fungus is now a white plant living with Lactarius or Russula. -- Larry Wallace Cincinnati
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