. Field and woodland plants. plants. The leavesare narrow and keeled ;and the small, whiteflowers are arranged insmall axillary clusters oftwo or three. The wholeplant is rough withhooked bristles. We conclude thischapter with a descrip-tion of the commonTeasel {Dipsacus sylves-Iris) of the order DipsacecB. This is really a very graceful plant, rarely less tlian threeor four feet high, and sometimes reaching six feet or more. Its stemis very stout and prickly; and its large bright green leaves are simple,sessile, and arranged in opposite pairs. They are prickly beneath,and the two leaves of ea
. Field and woodland plants. plants. The leavesare narrow and keeled ;and the small, whiteflowers are arranged insmall axillary clusters oftwo or three. The wholeplant is rough withhooked bristles. We conclude thischapter with a descrip-tion of the commonTeasel {Dipsacus sylves-Iris) of the order DipsacecB. This is really a very graceful plant, rarely less tlian threeor four feet high, and sometimes reaching six feet or more. Its stemis very stout and prickly; and its large bright green leaves are simple,sessile, and arranged in opposite pairs. They are prickly beneath,and the two leaves of each pair are united at their bases in such amanner that they form hoUows in w^iich the rain-water reservoirs so formed often contain drowned insects which haveflown or fallen into the water, or which have been washed downthe stem by the rain. Their- dead bodies decompose, giving riseto nitrogenous and other products of decay which generally discolourthe water. These products are valuable as plant food, and it has. The Teasel. 174 FIELD AND WOODLAND PLANTS been said that they are absorbed by the leaves. The flowers of theTeasel are collected in large heads, covered with straight, stiffbristles, and have an involucre of bracts which curve flowers are of a pale purple colour. They commence to opennear the middle of the head, forming a horizontal circle ; and then
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