. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. SCROPHULARINEAE 215 contradiction is afforded to the Knight-Darwin Law that, ' No organic being can fertilize itself through an unlimited number of generations; but a cross with other individuals is occasionally—perhaps at very long intervals—indispensable.' (Cf. Vol. 1, p. 9.) In older flowers the style bends so far back that the stigma and anthers touch one another, automatic self-pollination being thus effected. Warming describes this as being effective b
. Handbook of flower pollination : based upon Hermann Mu?ller's work 'The fertilisation of flowers by insects' . Fertilization of plants. SCROPHULARINEAE 215 contradiction is afforded to the Knight-Darwin Law that, ' No organic being can fertilize itself through an unlimited number of generations; but a cross with other individuals is occasionally—perhaps at very long intervals—indispensable.' (Cf. Vol. 1, p. 9.) In older flowers the style bends so far back that the stigma and anthers touch one another, automatic self-pollination being thus effected. Warming describes this as being effective both in Greenland and Spitzbergen, as shown by the setting of abundant fruits. With regard to anthesis and the setting of fruits in Spitzbergen the species agrees with P. lanata, according to the observations of Andersson and Hesselman, and also those of Ekstam. Specimens collected by Vanhoffen and Dr. von Drygalski in Greenland possessed, when fresh, a corolla 15 mm. long, pale-red in colour with a deep-red upper lip: a white variety was also noticed. Ripe fruits were also seen at Sermilik as early as July 8 (1892). 2164. P. sudetica Willd. (Warming, Bot. Tids., Kjobenhavn, xvii, 1890, p. 215.)—For Nova Zemlia Ekstam describes the flowers of this species as red in. Fig. 312. Pedicularis SccptrumCarolinum, L. (after E. Warming). A. Flower in the natural position (xf). B. I)o., after removal of the lower lip {D, is part of same in side view after removing part of upper lip). C Part of a flower 25 mm. long, seen from the front; the stigma projects less than in B^ and the anthers are still undehisced (cf. F) {H is the tip of the style of the same flower). E. Lower lip of B. G. Ovary and nectary. (/, nectary ; si, stigma; z/, smooth reflexed edge of upper lip. colour, smelling like jessamine, and protogynous. Autogamy may perhaps be possible, for the projecting persistent stigma lies in the line of pollen fall. Visitors.—Ekstam (Nova Zemlia) saw no visitors in 1891, but in 1
Size: 1927px × 1297px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublisheroxfor, bookyear1906
