Nature and development of plants . lly matures as a nut, butin many cases a kind of drupe (page 365) is formed, owing tothe perianth becoming fleshy and enveloping the nut. The fruitof the mulberry is an aggregation of drupes. In the fig the stemenvelops the minute curious flowers and becomes fleshy, formingthe edible portion of the fruit. 141. Orders Showing an Advance over Preceding Forms.—The buckwheat order, Polygonales, containing such familiarweeds as the sorrel, dock (Rumex), and knotweed or smartweed(Polygonum), has perfect regular flowers with a distinct characters also ap
Nature and development of plants . lly matures as a nut, butin many cases a kind of drupe (page 365) is formed, owing tothe perianth becoming fleshy and enveloping the nut. The fruitof the mulberry is an aggregation of drupes. In the fig the stemenvelops the minute curious flowers and becomes fleshy, formingthe edible portion of the fruit. 141. Orders Showing an Advance over Preceding Forms.—The buckwheat order, Polygonales, containing such familiarweeds as the sorrel, dock (Rumex), and knotweed or smartweed(Polygonum), has perfect regular flowers with a distinct characters also appear in the allied goosefoot order, Cheno-podiales, with its great array of common weeds, as the goosefoot(Che no podium), orache (Atriplex), tumbleweed and pigweed 404 THE RANALES (Amarantluts). The flowers are arranged in loose clusters andare for the most part small and anemophilous (Fig. 303). How-ever, it is noteworthy that some of the genera are entomophilous,the calyx becoming larger and brightly colored and nectar glands. Fig. 302.
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