[201 and 202]

Fig 17.

Lathyrus nissolia. Movement of whole young plant kept in darkness & traced in darkness on a horizontal glass from 6° 45' am to 10' 35' P.m. 7° a.m. Nov. 22d.— Tracing magnified 6 times (in the woodcut)

[Figure] Lathyrus nissolia Novr. 21'

Fig. 17 (reduced to (1/2 scale) no lettering)

[202v]

(17

diœcious species, & the remarks made under the last class with respect to the differences in the flowers of the two sexes are here applicable. It is at present an inexplicable fact that with some diœcious plants, of which the Restiaceæ of Australia & the Cape of Good Hope offer the most striking instances, the differentiation of the sexes has affected the whole plant to such an effect extent (as I hear from Mt Thiselton Dyer) that Mr Bentham & Prof. Oliver have found it impossible to match the males & females specimens of the same species. In my seventh chapter some observations will be given on the gradual conversion of heterostyled & of ordinary hermaphrodite plants into a diœcious or sub-diœcious species.) of condition.)

(Our fourth & last Class consists of the plants which were called by Linnæus polygamous; but it appears to me that it would be convenient to confine this term to the species which co-exist as hermaphrodite, males & females; & to give new names to several other combinations of the

[Forms of flowers, pp. 10-11: "The third Class consists of diœcious species, and the remarks made under the last class with respect to the amount of difference between the male and female flowers are here applicable. It is at present an inexplicable fact that with some diœcious plants, of which the Restiaceæ of Australia and the Cape of Good Hope offer the most striking instance, the differentiation of the sexes has affected the whole plant to such an extent (as I hear from Mr. Thiselton Dyer) that Mr. Bentham and Professor Oliver have often found it impossible to match the male and female specimens of the same species. In my seventh chapter some observations will be given on the gradual conversion of heterostyled and of ordinary hermaphrodite plants into diœcious or sub-diœcious species.
The fourth and last Class consists of the plants which were called polygamous by Linnæus; but it appears to me that it would be convenient to confine this term to the species which co-exist as hermaphrodites, males and females; and to give new names to several other combinations of the sexes—a plan which I shall here follow. Polygamous plants, in this confined sense of the term, may be divided into two sub-groups, according as the three sexual forms are found on the same individual or on distinct individuals."]