Toxic toad evolves

[Richard Jensen]

Many so-called weeds are remontant (flower in spring and again in fall) if conditions are right.  Might this simply be an inherent tendency that has gone unnoticed?

Dick J

Monique Reed wrote:

> No one has done a definitive study, but I have noticed that over the last twenty years here in Central Texas, several of our most aggressive introduced weeds have changed.   Rapistrum rugosum (Brassicaceae) and two species of Ligustrum, L. sinense and L. quihoui now commonly flower in the fall as well as in the spring.  With two reproductive periods per year, they can be twice as nasty.
>
> Monique Reed
> Biology Dept.
> Texas A&M

--
Richard J. Jensen              | tel: 574-284-4674
Department of Biology      | fax: 574-284-4716
Saint Mary's College         | e-mail: rjensen at saintmarys.edu
Notre Dame, IN 46556    | http://www.saintmarys.edu/~rjensen