Journal of the Proceedings of the Linnean Society: Botany, Volumes 7-8Linnean Society, 1864 |
Other editions - View all
Common terms and phrases
Abyssinia acuminatis acutis America Anders angustis anthers apice apicem Arctic basi bracteis bracts brevi brevibus brevioribus Brid C. B. S. Ex calyce calycis Calyx Cameroons Mountains capsule Cascade Mountains caule Caulis cellulis Clarence Peak coriaceis Corolla culmis dimorphic dorso Drège elongatis erectis feet Fernando Fernando Po fertilized Flores floribus flowers Folia foliis Fort Colville genera genus glabra glumes glumis gracili Hedw herb heteromorphic unions Hochst homomorphic homomorphic unions Hook imbricatis Island Kunth labellum lanceolatis lata leaves Linn lobis long-styled form longa longæ longi Lyall Mann MANNII marginibus membranaceis Mitten Mount Tilla Nees nervo oblongis obtusis operculo ovary ovatis parvis patentibus perichætialibus peristome peristomio petals petiolatis pistil plant pollen pollen-grains pollinia ramis ramoso ramulis River Rocky Mountains Schimp seeds serrulatis short-styled form species specimens spikelets stamens stigmas sub apice subulatis superne theca theca in pedunculo trees tubo utrinque
Popular passages
Page 125 - There is no more reason to think that species have been specially endowed with various degrees of sterility to prevent them crossing and blending in nature, than to think that trees have been specially endowed with various and somewhat analogous degrees of difficulty in being grafted together in order to prevent them becoming inarched in our forests.
Page 169 - Altogether this one species includes three females or female organs and three sets of male organs, all as distinct from one another as if they belonged to different species; and if smaller functional differences are considered, there are five distinct sets of males. Two of the three hermaphrodites must co-exist, and pollen must be carried by insects reciprocally from one to the other, in order that either of the two should be fully fertile; but unless all three forms co-exist, two sets of stamens...
Page 169 - ... pollen is carried from one to the other, the scheme is perfect ; there is no waste of pollen and no false coadaptation. In short, nature has ordained a most complex marriage-arrangement, namely a triple union between three hermaphrodites, — each hermaphrodite being in its female organ quite distinct from the other two hermaphrodites and partially distinct in its male organs, and each furnished with two sets of males.
Page 125 - ... in their vegetative systems, so in crossing, the greater or less facility of one species to unite with another is incidental on unknown differences in their reproductive systems. There is no more reason to think that species have been specially endowed with various degrees of sterility to prevent their crossing and blending in nature, than to think that trees have been specially endowed with various and somewhat 'analogous degrees of difficulty in being grafted together in order to prevent their...
Page 130 - ... half-full of a fluid secreted by organs situated at the base of the column. They then crawl along in the water towards the anterior side of the bucket, where there is a passage for them between the opening of this and the column. If one is early on the look-out, as these Hymenopterse are early risers, one can see in every flower how fecundation is performed.
Page 75 - Yet we plainly see that the. two pollens and the two stigmas are widely dissimilar in action, the stigmas of each form being almost powerless on their own pollen, but causing, through some mysterious influence, by simple contact (for I could detect no viscid secretion), the pollen-grains of the opposite form to protrude their tubes. It may be said that the two pollens and the two stigmas by some means mutually recognize each other. Taking fertility as the criterion of distinctness, it is no exaggeration...
Page 196 - ... thought to be the very touchstone of specific distinction. We now see that such sexual differences — the greater or less power of fertilizing and being fertilized — may characterize and keep separate the coexisting individuals of the same species, in the same manner as they characterize and have kept separate those groups of individuals, produced from common parents during the lapse of ages or in different regions, which we rank and denominate as distinct species.
Page 138 - This bowl is pierced with hundreds of small oval holes about the size of a thimble, with hollow tubes corresponding on the outside, through which the roots penetrate the ground on all sides, never, however, becoming attached to the bowl ; their partial elasticity affording an almost imperceptible but very necessary " play " to the parent stem when struggling against the force of violent gales.
Page 143 - India," originally described by Dr. Carter in the Transactions of the Medical and Physical Society of Bombay, No. 6, new series for 1860. (See the account of
Page 77 - Docks, and other pknts) so as to secure the chanceblown grains. In plants which are fertilized by the wind, the flowers do not secrete nectar, their pollen is too incoherent to be easily collected by insects, they have not bright-coloured corollas to serve as guides, and they are not, as far as I have seen, visited by insects.