[A54]

10

(add note to p. 26)

Linn Trans XIII, p. 595. T. Smith on certain species of Carduus & Cnicus Cnicus which appear to be dioecious — "Cricus arvensis rarely produced seed, wh. has been accounted for by its extension by roots, say in more satisfactorily explained by the separation of the sexes.

p. 599 In the male Cnicus arvensis, the stigma is considerably developed, though when compared with a female flower a much less development is perceived: Hence many flowers must be examined = X first stage of abortion = (In Cnicus Palustris & acaulis concludes that there are only hermaphrodite & female flowers, the former most abundant Thyme case)

p 600 in Serratula tinctoria Mr. Brown has pointed out existence of female plants, has not seen male [Insertion:] The necessary of production on more pollen must lead to abortion of ♀organ

—the seeds of the female plants are larger than in the hermaphrodite "in this species plants occurred showing regular gradation from the female to hermaphrodite, in other female the antheræ were much smaller, shorter than they are most frequently found, in another latter & projecting & enlarging styles as in hermaphrodite, but containing only a few grains of abortive pollen — in the Serratula, the stigma is developed before anther if of its own flower (in the hermaphrodite) & therefore requires cross impregnation

p. 600 "this is a striking example of a male impregnation which according to Cassini present nearly throughout the Compositæ, which renders necessary the presence of at least 2 flowers Dichogam

p. 602 in Ch Cricus arvensis in male flower is nearly same length during flowering, but it never increases afterwards which in case with female plants.

Lobelia — [illeg]

see Back