. A text-book of botany for secondary schools. Botany. ANGIOSPERMS 223 however, the petals appear to be united so that the corolla becomes a cup, urn, tube, funnel, or the like (Figs. 208 and 209). This condition of the corolla is so constant in the highest group of Angiosperms that the group is called the Sympetaloe, because the corollas are sympetalous (petals together). In many flowers with sympetalous corollas there is an irregular development, so that the mouth of the Fig. 209.—Sympetalous flowers: A, bluebell; B, phlox; C, dead-nettle; D, snap- dragon; E, toadflax.—After Gray. ins
. A text-book of botany for secondary schools. Botany. ANGIOSPERMS 223 however, the petals appear to be united so that the corolla becomes a cup, urn, tube, funnel, or the like (Figs. 208 and 209). This condition of the corolla is so constant in the highest group of Angiosperms that the group is called the Sympetaloe, because the corollas are sympetalous (petals together). In many flowers with sympetalous corollas there is an irregular development, so that the mouth of the Fig. 209.—Sympetalous flowers: A, bluebell; B, phlox; C, dead-nettle; D, snap- dragon; E, toadflax.—After Gray. instead of being regular, is divided into two unequal lips, as in the mints and many others (Fig. 209, C—E). Such flowers are said to be bilabiate (two-lipped), and on this account the Mint Family is named Labiatce. Such corollas may have further irregularities in the form of more or less conspicuous projections at the base called spurs (Fig. 209, E). It must not be supposed that irregular growths are found only in connection with sympetalous corollas; for the sweet pea represents a great family in which the petals are all separate, and yet they are very much unlike; and in the violet, whose petals are distinct, one of them has a conspicuous spur. The corolla is useful in protecting the young stamens and carpels, but it is also associated with the visits of insects, a subject which will be spoken of 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 Coulter, John Merle, 1851-1928. New York, D. Appleton
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectbotany, bookyear1906
