42 PLANT LIFE. 



covered with a sticky secretion^ which acts in the same 

 way. 



2. Hairs of a light feathery nature are developed on 

 some part of the seed or fruit. The wind catches 

 these hairs, and scatters the fruit or seed. 



Fig. 4. — Fruit AND Seed Distribution. (i)Wigtree(/?;^?^5-c^//«?<j) showing 

 hairs on flower stalks. (2) Yorkshire Fog {Holcus) showing wing bracts. (3) 

 Reed grass {Phragiuites cotni/nmis) spikelet and, (4), single flower enclosed in 

 bracts with windhairs below. (5) Winged fruit of Ptelea trifoliata. (6) Seeds 

 of Bog Asphodel ( Narthecimn ossifragum) with gossamerlike hairs. (7) A Grass 

 (Tragus) with spines. (8) Pod oi Medicago showing clinging hooks. 



3. Wings or aeroplanes are developed for the same 

 reason. 



4. Special floating tissue is produced so that the 

 seed or fruit can be carried by water. 



