. Elementary botany. Botany. 460 RELATION TO ENVIRONMENT. are whirled along, often iniles awav In laic spring or early summer the pods of the willow burst open, exposing the seeds, each with a tuft of white hairs making a mass of soft down. As the delicate hairs dry,. Toucli-me-not (Impatiens fulva) ; side and frtjnt view of flower below; aho\e unopened pod, and opening to scatter tlie seed. they straighten out in a louse spreading tuft, wldch frees the individual seeds from the C(.>mpact mas?. Here they are caught b_\' currents of air and float off singly or in smaU chmJs. 895. The prickly
. Elementary botany. Botany. 460 RELATION TO ENVIRONMENT. are whirled along, often iniles awav In laic spring or early summer the pods of the willow burst open, exposing the seeds, each with a tuft of white hairs making a mass of soft down. As the delicate hairs dry,. Toucli-me-not (Impatiens fulva) ; side and frtjnt view of flower below; aho\e unopened pod, and opening to scatter tlie seed. they straighten out in a louse spreading tuft, wldch frees the individual seeds from the C(.>mpact mas?. Here they are caught b_\' currents of air and float off singly or in smaU chmJs. 895. The prickly lettuce.—Tn late summer or early autumn the seeds of the pjrickh' lettuce (Lactuca scariola) are caught u]"i from the roadsides by the winds, and cai-ried t<j lichls whi're the\' are as "well as unwel- come guests. This phmt is shuwn in lig. 483. 896. Tlie wild lettuce.—A related specie'^. the wild lettuce ( cana- densis) occurs on roadsidi's ami in the borders ui fields, ami is about one meter in height. The heads nf small yellow or juujtie flowers are arranged in a louse or branchino; paidcle. The flowers are rather inccnispicuous, the rays projecting but little abo\'(,- the apex ol the invttUicral bracts, which closely press together, forming a fl(.)wcrdiead more t.)r le^s flask- shaped. At the time of flowering the involucral bracts spread somewhat at the apex, and the tips of the flowers are a little more prominent. As the flowers then wither, the bracts press closely toocther again and tlie head is dosed. As the seeds ripen the bracts die, and in drying bend outward and down- ward, around the tluwer stem below, or they fall away. The seeds are. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Atkinson, George Francis, 1854-1918. New York : H. Holt
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