Students' handbook to accompany Plants and their uses . kinds ofplants, as clover, golden-rods, and willows, thatgrow in damp dodders (fig. 34) andsome root parasites, suchas the beechdrops, squaw-root, and cancer-root, arecomplete parasites and haveno green foliage. Otherplants, such as the mistle-toe (fig. 35), have green leaves and do photosynthetic work,but depend on the host for water and the mineral substancesdissolved in it. Such plants are called jmrtnil j>n/-nx/f<-x. 53. Damage inflicted by parasites. Many parasites take somuch water and plant food from the host that
Students' handbook to accompany Plants and their uses . kinds ofplants, as clover, golden-rods, and willows, thatgrow in damp dodders (fig. 34) andsome root parasites, suchas the beechdrops, squaw-root, and cancer-root, arecomplete parasites and haveno green foliage. Otherplants, such as the mistle-toe (fig. 35), have green leaves and do photosynthetic work,but depend on the host for water and the mineral substancesdissolved in it. Such plants are called jmrtnil j>n/-nx/f<-x. 53. Damage inflicted by parasites. Many parasites take somuch water and plant food from the host that they maycause serious injury to cultivated plants and to forest flax dodder and the clover dodder often do great damageto crops in this country and in Europe, and another species1is sometimes troublesome in fields of alfalfa. In the south-western states the American mist letoe is so injurious to dicoty-ledonous trees that it is often necessary to cut it away from 1 Cuscitta ;. 35. Mistletoe growing upon a branch of an apple treeAfter Bnniiier and Sablon FOODS IN PLANTS 53 the trees to enable them to thrive. The European mistletoecauses much damage to apple trees in northern France and in the Tirol. 54. Carnivorous are many kinds ofplants (probably more thanfour hundred species) whichcapture insects and othersmall animals. In somecases at least they maydigest the captured animalsas a part of their food sup-ply. Some of these plantsentrap their prey by meansof hollow leaves, some bymeans of sticky secretions,and some by means ofquickly closing, trap-likeleaves. The best type ofcarnivorous plant is thesundew (fig. 36). This isa low marshplant havinghairy leavesand a slenderflower stalk,on which areborne smallwhite one widelydistributed spe-cies the leafconsists of a narrow blade tapering into a moderately long leafstalk. Onthe inner surface and around the margin of the blade areborne a number of short bristles, each terminating in a
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Keywords: ., bookcentury1900, bookcollection, bookdecade191, booksubjectbotany
