. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. FiQ. 390. 464. The mangrove grows on the low shoresof tropical lands. It extends as far north asthe twenty-ninth parallel in Flor-ida, and occurs at the mouth ofthe Mississippi and on the coastof Texas. It is a spreading bush,reaching a height of 15 to 25 feetupon the shores, but becoming atall tree in interior places. It isan important agent in the extensionof land into the sea. The meansby which this result is accomplished ^he beginning of are two. germination in the 465. The fruit is ™ sma
. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. FiQ. 390. 464. The mangrove grows on the low shoresof tropical lands. It extends as far north asthe twenty-ninth parallel in Flor-ida, and occurs at the mouth ofthe Mississippi and on the coastof Texas. It is a spreading bush,reaching a height of 15 to 25 feetupon the shores, but becoming atall tree in interior places. It isan important agent in the extensionof land into the sea. The meansby which this result is accomplished ^he beginning of are two. germination in the 465. The fruit is ™ small and capsule-like, but does not fall from the tree at maturity. A fruit is shown natural size in Fig. 390. The seed is germinating, send- TJ The hypo- ^^S its cauliclc out through the apex . otyieniarg- of the fruit. In Fig. 391 the |l °^ germination is further progressed. * 466. In Fig. 392, germination is nearly completed. The seed has endosperm. The cotyledons do not unfold in germination, but a woody tube grows from them and projects from. Fio. 391. 372 LESSOJrS WITS PLANTS \ Fig. 392, the fruit to the pointa. Inside this tubeis the plumule. Thehypocotyl continuesto elongate, becomingthick and heavy at its lower six inches or a foot long, itbreaks away from the joint a, carry-ing the liberated plumule with it, andstrikes root-end down in the push out from the lower end,and the epicotyl rapidly elongates andrears itself above the water. 467. A piece of a mangrove branchis shown natural size in Fig. 393. Anaerial root is pushing through thethick bark. 468. The root makes a strong curve when it strikes oflE the branch, and then grows directly • downward towards the water. The branch from which it springs may be only a few inches above the water, or it may be ten feet; but the root pushes on until it inserts itself in the mud, and there makes The hypocotyl nearly full grown, a rOOt Systcm of itS OWU. TRE MANGROVE 373 Fig. descending root. These
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Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
