M. Planchon[548] gives an account of some very curious malformations in Drosera intermedia, which go to show that the ovules are homologous with the glandular hairs on the margins of the leaves of these plants, an opinion corroborated by the researches of MM. Grönland and Trécul.[549]
Dr. Hooker shows that the pitcher of Nepenthes is due to a modification of a gland placed at the extremity of the midrib.[550]
Formation of tendrils.—These are of very varied morphological import; sometimes they are degenerated peduncles, as in passion-flowers, or vines; at other times they are of foliar origin; or, again, they may proceed from the segments of the perianth, as in Hodgsonia and some other cucurbitaceous plants. From their very different origin in different plants it is necessary to study the development in each case, and not apply to the generality what may be peculiar to one. In any case this formation in question generally belongs more to general morphology than to teratology.[551]
Kirschleger, however, has recorded the existence of a cirrhose sepal in Cucurbita Pepo.[552]
FOOTNOTES:
[547] 'Consid. Org. Fleur.,' p. 44, pl. ii, fig. 23.
[548] 'Ann. Sc. Nat.,' 3 ser., Bot. ix, pl. 6, ff. 1, 2.
[549] 'Ann. Sc. Nat.,' 3 ser., Bot. 1855, pp. 297, et 303.
[550] 'Trans. Linn. Soc.,' xxii, p. 415.
[551] See Darwin, "On Climbing Plants," 'Journal of Linnean Society,' vol. ix, p. 1.