. Nature and development of plants. Botany. 482 THE RUB I ALES alterations made that lead up to the specialized types. Look back over the preceding groups and orders and note that many of the irregular types of flowers are preceded by a long series of regular forms. So in the madder order, this new departure of the flower is attended with such a simplicity of structure as to render difficult the separation of some of the genera from the open flowers of the Umbellales which have also arrived at the. Fig. 335. Simpler forms of the Rubiales: A, inflorescence of the arrow- wood (Viburnum). B, simp
. Nature and development of plants. Botany. 482 THE RUB I ALES alterations made that lead up to the specialized types. Look back over the preceding groups and orders and note that many of the irregular types of flowers are preceded by a long series of regular forms. So in the madder order, this new departure of the flower is attended with such a simplicity of structure as to render difficult the separation of some of the genera from the open flowers of the Umbellales which have also arrived at the. Fig. 335. Simpler forms of the Rubiales: A, inflorescence of the arrow- wood (Viburnum). B, simple, epigynous flower of the elderberry (Sam- hucus)—0, ovary. C, the twin flower (Linnaea). same stage of development, page 465. This would not necessarily imply a relationship, since it repeatedly happens both among plants and animals that identically similar structures arise in groups in no way related. From these simple flowers, that may be no more sympetalous than certain genera of the carrot order, we pass to more pronounced tubular forms in the bluets (Hous- tonia), buttonbush (Cephalanthus), twin flower {Linnaea, Fig. 3351 Q> snowberry {Symphoricarpus) and finally to irregular and even labiate types as in the honeysuckle {Lonicera, Fig. 268), valerian, teasel (Dipsacus) and scabious (Fig. 336). It is noteworthy that in the three latter genera the flowers become massed in a dense inflorescence, known as a head, which are sub-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
Size: 1610px × 1552px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectbotany
