My Dear Darwin

Thanks for your note about the dimorphics.¹

The Lithospermums of S Batschia are dimorphic—as is well known. But one of them, L. longiflorum (Pentalophus A. D^l.) turns out to bear, later in season (and in some plants from the first?) smaller and smaller flowers,—of which some must be cleistogenous.² Now of this a long series of the long-flowered state in the herb^m. shows only one form of stamens & style, i.e. is not dimorphic, that I can see.

It is the only one that is cleistogenous. Curious, that it should take to this instead of dimorphism

Yours ever | A. Gray