. Experiments with plants. Botany. ments of seeds, especially the parachutes, impaired by rain and dew! Test them by placius' them in water; are they readily wetted "t You have probably noticed that fruiting Dandelion heads open only in dry, sunny weather, when the seeds can fly to best advantage; at the approach of rain they close up tight, so that the tiny parachutes are kept perfectly dry. Study also the Willow Herb (Epilobium) and the Pines in this connection. In many 173. Hop fruit, wMoh aies cases you will find that while the by means of a bract. seeds are not protected from rain, a
. Experiments with plants. Botany. ments of seeds, especially the parachutes, impaired by rain and dew! Test them by placius' them in water; are they readily wetted "t You have probably noticed that fruiting Dandelion heads open only in dry, sunny weather, when the seeds can fly to best advantage; at the approach of rain they close up tight, so that the tiny parachutes are kept perfectly dry. Study also the Willow Herb (Epilobium) and the Pines in this connection. In many 173. Hop fruit, wMoh aies cases you will find that while the by means of a bract. seeds are not protected from rain, and may become drenched, yet they do not become de- tached from the parent plant until perfectly dried out and in condition for flying. The burs, " stickers," and ^^tnTwh^rrw^ouTTrll: othcr troublesomc fruits which wall of the seed-case (ovary). attach thcmSelveS tO clotMng, show how easily plants distribute them- selves by means of animals. Usu- ally the organs of attachment are not borne on the seed itself, but on the ovary-wall, on bracts or on the stem or flower-stalk. On examining such fruits (Figs. 175 to 178) with a hand- 175. Burdock 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 Osterhout, Winthrop John Van Leuven, 1871-. New York, The Macmillan company; London, Macmillan & co. , ltd.
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