. Plant life, considered with special references to form and function. Plant physiology. DISTRlBUriOX OF SPOKES AND SEEDS. 30/ fur, is generally secured either bv suriaces made adhe>ive bv the stick'\' secretion from ghindiilar hairs, or by the develop- ment of outgrowths in the form of hooks or barbed pri( kles (figs 412, 413, 414, 415 ). A few water animals and wading birds distribute seeds which happen to fall into the mud by the adhesion of this mud to their bodies. The fleshy fruits with edible parts are usually colored to attract the notice of the fruit- eating animals. Seeds which es
. Plant life, considered with special references to form and function. Plant physiology. DISTRlBUriOX OF SPOKES AND SEEDS. 30/ fur, is generally secured either bv suriaces made adhe>ive bv the stick'\' secretion from ghindiilar hairs, or by the develop- ment of outgrowths in the form of hooks or barbed pri( kles (figs 412, 413, 414, 415 ). A few water animals and wading birds distribute seeds which happen to fall into the mud by the adhesion of this mud to their bodies. The fleshy fruits with edible parts are usually colored to attract the notice of the fruit- eating animals. Seeds which escape crushing by the teeth or grinding in tlie gizzard are apt to be in condition to germi- nate when \ oided. The seeds of the mistletoe are sepiarated from the pulp of the berry by the birds which eat Fig. 414. 1 â , ,1 1 -n Fig. 414.âA, cluster of fruits of Spanish , Sticking to the bill, are needles (S/a'.-«W.,//««,.Aj). /.â , a single â¢\ rr ., 1 i_ fruit enlarged, slio'^ini: barbed a\%Tis, rep- Wlpecl Ott on the branches resenting the caU-x lobes, by which it ad- r . 1 J1 - lieres to animals. A, natural size; B, of trees, where they germi- magnified 2} Kemer. Fig. 415. âFruit of cockle-bur ( XaJithiinu nate. .s-/3-;^7;/rt?-//^/;/),hai\'ed, showing two seeds. rr^i 1 . ^. c ^ t. ^ the upper of which usually germinates a i he adaptation Ot plants to ^ear later than the lower. Natural ^ , 1 ^ r .-Vfter Arthur. any one ol these agents of distribution is likely to l.)e more or less eft'ecti\'e with other agents. For example, the tufts of hairs which increase the buoyancy of the seed in air would be equallv effective should the seed chance to alight upion water, or thev may suffice to entangle the seed in the iur of animals. 494. Adaptations for germination.âAdaptations for dis- tribution not infrecpienth- also secure ad\'antage in germina- tion. It is important for many seeds that they be anchored to the ground when tliey have on
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