United States or Angola ? Vote for the TOP Country of the Week !
The distance between the insertion of the flowers of O. biennis is great when compared with that of O. muricata. Hence the flowers of the latter species are more crowded and those of O. biennis more dispersed, the spikes of the first being densely crowned with flowers and flower-buds while those of O. biennis are more elongated and slender.
Hence there can be little doubt that the unpaired units are the cause of this decrease in reproductive power. The genus Oenothera is to a large degree devoid of varietal characteristics, especially in the subgenus Onagra, to which biennis, muricata, lamarckiana and some others belong.
Concerning this matter Professor de Vries writes under date of Sept. 12, 1905: "The 'biennis' which I collected in America has proved to be a motley collection of forms, which at that time I had no means of distinguishing. No one of them, so far as they are now growing in my garden is identical with our biennis of the sand dunes." The same appears to be the case with O. muricata.
O. biennis and O. muricata have their stigmas in immediate contact with the anthers within the flower-buds, and as the anthers open in the morning preceding the evening of the display of the petals, fecundation is usually accomplished before the insects are let in. But in O. lamarckiana no such self-fertilization takes place.
This form is met with in different parts of France, while the biennis and muricata are very common in the sandy regions of Holland, where I have observed them for more than 40 years. They are very constant and have proven so in my experiments. Besides these three species, the large-flowered evening-primrose, or Oenothera lamarckiana, is found in some localities in Holland and elsewhere.
But whereas the hybrid of muricata and biennis is a stout plant, this type is weak with badly developed foliage, and very long strict spikes. Perhaps it was not able to withstand the bad weather of the last few years. A goodly number of constant hybrids are described in literature, or cultivated in fields and gardens.
These beds rest on the Lower Headon, and are considered as the equivalent of the middle part of the Headon series, many of the shells being common to the brackish-water or Middle Headon beds of Colwell and Whitecliff Bays, such as Cancellaria muricata, Sowerby, Fusus labiatus, Sowerby, etc. In these beds at Brockenhurst, corals, ably described by Dr.
But it is very difficult to distinguish between them, and if biennis and hybrid flowers were separated from the plants and thrown together, it is very doubtful whether one would succeed in separating them. The next point is offered by the foliage. The leaves of O. biennis are broad, those of O. muricata narrow.
This was that the so-called ova of Flustra had the power of independent movement by means of cilia, and were in fact larvae. In another short paper I showed that the little globular bodies which had been supposed to be the young state of Fucus loreus were the egg-cases of the wormlike Pontobdella muricata.
Olicancilleria Braziliensis d'Orbigny. 4. Olicancilleria auricularia, d'Orbigny. 5. Olivina puelchana, d'Orbigny. 6. Buccinanops cochlidium, d'Orbigny. 7. Buccinanops globulosum, d'Orbigny. 8. Colombella sertulariarum, d'Orbigny. 9. Trochus Patagonicus, and var. of ditto, d'Orbigny. 10. Paludestrina Australis, d'Orbigny. 11. Fissurella Patagonica, d'Orbigny. 12. Crepidula muricata, Lam. 13.
Word Of The Day