. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. CRUCIFERAE "5 All of them dehisce introrsely, and remain in their original position; those of the long stamens project a little from the entrance of the flower, while those of the short stamens—together with the stigma—are in it. Automatic self-poUination is possible, though the anthers are remote from the stigma. 285. T. praecox Wulf.— Visitors.—Schletterer observed the following at Pola.— Hymenoptera. (a) Apidae: i. Andrena convexiuscula K.; 2. A. dec
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. CRUCIFERAE "5 All of them dehisce introrsely, and remain in their original position; those of the long stamens project a little from the entrance of the flower, while those of the short stamens—together with the stigma—are in it. Automatic self-poUination is possible, though the anthers are remote from the stigma. 285. T. praecox Wulf.— Visitors.—Schletterer observed the following at Pola.— Hymenoptera. (a) Apidae: i. Andrena convexiuscula K.; 2. A. deceptoria Schviiedekn.; 3. A. tscheki Mor. (6) Tenthredinidae: 4. Athalia rosae L., var. liberta Klug. 85. Teesdalia R. Br. Small, white, bilaterally symmetrical flowers, with half-concealed nectar. Four nectaries. 286. T. nudicaulis (Herm. MuUer, 'Fertilisation,' pp. 106-8, 'Weit. Beob.,' II, pp. 199-200 ; Knuth, ' Bl. u. Insekt. a. d. nordfr. Ins.,' p. 20,' Weit. Beob. ii. Bl. u. Insekt. a. d. nordfr. Ins.,' p. 231.)—Hermann Miiller says that during anthesis the flowers are aggregated to form a flat surface, and the outer petals are larger than the others, as in the Umbelliferae. In Teesdalia, however, as the flowers successively fade the axis of the inflorescence lengthens, and the flat surface is drawn out into a raceme, each flower becoming marginal in its turn. Hence all the flowers have the outer side of the corolla enlarged, and not only—as in the Umbelliferae and Compositae—those which are originally at the a ff ilI 1 ill \ 9 \ Fig. 34. Teesdalia nudicaulis, R. Br. (after Herm. Muller). (l) Flower seen from above. (a) An- terior half of a flower. (3) One of the long stamens with a nectary, seen from outside. (4) One of the two short stamens, seen from outside, i, inner sepal; j', outer sepal; s"-, lateral sepal; p, inner petal; /', outer petal: a. short stamens; a\ inner long stamens; a-, outer long stamens; x, y, petaloid appendages of
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