Re: Jack in the Pulpit


Here are the original sources:

Richardson, C. & K. Clay 1995. The evolution and maintenance of sex
change in Arisaema triphyllum. 
Am. J. of Botany, Supplement 82(6):55.

Wurdack, John J. 1983. Sex and Size in Arisaema. Bulletin of the American
Rock Garden Society. 41(1):9-10.

Bierzychudek, Paulette.  1981.  The demography of Jack-in-the-Pulpit, a
forest perennial that                    changes sex.  PhD thesis. 
Cornell Univ.  145 pages.

I don't have a record of other papers on the subject, but these papers
probably have bibliographies.

It is well understood that Arisaema starts it's sex life neuter, becomes
male in the second season, turns female in a couple of years if growing
conditions are good. Poor conditions will cause it to revert to male and
even stay dormant for a whole season, worst case. Inadequate moisture is
probably the principal problem. Hopefully the references will expound
upon the subject.

You might be interested to know that some Arisaema species grow only a
corm and roots the first season (no leaf appears). The second season the
leaf appears and all is normal. Needless to say, many good seedlings go
to the dump before people learn about this trait.

By the way, John Wurdak is a member of the Arisaema Enthusiast's Group
and might be very helpful. He is not on-line, so you'll have to write to
him at:

John Wurdack
4400 Samar St.
Beltsville, MD 20705


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