. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. t,are always diclinous. These comprise all the oaks, chestnuts, hazels,willows, poplars, birches, alders, beeches, hornbeams, walnuts andhickories; and these are for the most part very early-flowering treesor bushes. The fruits of many of them are nut-like. 182. It is evident that the catkin is only onekind of a flower-cluster; and as we shall so oftenneed a comprehensive term to designate the modeof flower arrangement, we shall hereafter use theword inflorescence. (See Obs. xxxv. and xxxvi.)
. Lessons with plants. Suggestions for seeing and interpreting some of the common forms of vegetation. t,are always diclinous. These comprise all the oaks, chestnuts, hazels,willows, poplars, birches, alders, beeches, hornbeams, walnuts andhickories; and these are for the most part very early-flowering treesor bushes. The fruits of many of them are nut-like. 182. It is evident that the catkin is only onekind of a flower-cluster; and as we shall so oftenneed a comprehensive term to designate the modeof flower arrangement, we shall hereafter use theword inflorescence. (See Obs. xxxv. and xxxvi.) 183. Since flower-clusters often branch, wecannot use the word peduncle (or flower-stalk)indiscriminately. We use it for the flower-stem,when the cluster is simple or unbranched; butwhen the cluster is branched, we use it for thestem of the entire cluster, while the particularstalklet upon which the flower is borne is calledthe pedicel. DICLINOUS FLO WEBS, CONTINUED 163 183a. Thus, the stem of the hepatiea (Fig, 131) is a peduncle;the main stem of the so-called flower of the dogwood (Fig. 154) is. Fig. flowers of the cucumber. a peduncle, and the real flowers are sessile; the staminate catkinsof the hickory (Fig. 160) are upon very short pedicels, three catkinsspringing from one peduncle. Suggestions.—Let the pupil determine whether the poplars, cot-tonwoods and willows which he passes on the streets are staminateor pistillate, and if there is any difference in habit between thesexes. Of the weeping willow and Lombardy poplar (which areforeign trees), only one sex has been introduced into this one is it? Why do strawberry-growers plant different varie-ties together? XXX. DICLINOUS FLOWERS, CONTINUED 184. The squashes and pumpkins send up yel-low, bell-like flowers on long, slender stalks allduring the summer months, but these flowers soon 164 ZHSSOIfS WITS PLANTS wither. One of them is seen in Fig. 161. It isa staminate flower, and its normal cour
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Keywords: ., bookauthorbai, bookcentury1900, bookdecade1900, booksubjectbotany
