. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. ARISTOLOCHIA CEAE 355 2496. A. Ruiziana Duch. (= A. Duchartrei Andr/); and 2497. A. elegans Mast.—These two species are tropical. Correns says (op. cit.) that there are two areas in the pit which are more thickly covered with hairs than the rest, and may be considered as nectaries. As the weel-hairs are only one-third as long as the lumen of the perianth tube, the barrier apparatus is formed by two projections. The hair thus touches the perianth wall at two
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. ARISTOLOCHIA CEAE 355 2496. A. Ruiziana Duch. (= A. Duchartrei Andr/); and 2497. A. elegans Mast.—These two species are tropical. Correns says (op. cit.) that there are two areas in the pit which are more thickly covered with hairs than the rest, and may be considered as nectaries. As the weel-hairs are only one-third as long as the lumen of the perianth tube, the barrier apparatus is formed by two projections. The hair thus touches the perianth wall at two separate points, one to the right and the other to the left of the joint, and is therefore able to resist lateral impact. 2498. A. grandiflora Sw. (Delpino, op. cit.)—This species is indigenous to the Antilles, and is distinguished by its wine-red colour and smell of carrion, which facts give rise to the supposition that the very large flowers are visited by carrion-flies. A tendril proceeding from the perianth limb winds round an adjacent branch to hold the flower in the right position for insect visitors. 772. Asarum L. The blossoms of species belonging to this genus are protogynous and not very conspicuous ; Hermann Muller describes them as nauseous flowers (Kosmos, Leipzig, iii, 1878). He considers that they perhaps act as prisons or at least as hiding-places for insect visitors, and so form a stage leading up to the mechanism of Aristolochia {c/. Vol. i, p. 128). 2499. A. europaeum L. (Delpino, 'Altri appar. dicog. recent, oss.,' pp. 61-2; Herm. Miiller, 'Fertilisation,' p. 517, Kosmos, Leipzig, iii, 1878; Kerner, 'Nat. Hist. PI.,' Eng. Ed. 1, IL p. 279; Kirchner, 'Flora V. Stuttgart,' p. 520 ; Knuth,' Bloemen- biol. Bijdragen.')—The flowers of this species grow singly close to the ground often hidden by fallen leaves. They are of a greenish - brown colour outside and dirty- red brown inside, not very conspicuous, and possessing a sharp, cam- phor-like odour. The thr
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