Lessons in elementary botany by Daniel Oliver

Author:Daniel Oliver
Language: eng
Format: epub
Publisher: Macmillan, 1878

Fig. 1x8.—Vertical section through flower-head of Sowthistle.

thistle); if part of them be imperfect, the heads are heterogamous (Daisy).

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COMPOSIT/E.

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Compare the common receptacles of Dandelion and Common Chamomile (Anthemis nobilis) after removing

— X

Fig. X19.—Chaffy {Jfaleaqeous) common receptacle of the Chamcroile.

the florets. In the fonner it is Haked, in the latter covered with small chaffy scales (paleaceous). In some plants the bracts of the involucre pass gradually into the palecB of the common receptacle.

Compare, also, the fruit-achenes of Thistle, Dandelion, and Daisy.

In Thistle they are crowned by a sessile crown of hairs, called a pappus (representing the limb of the calyx in Composites); in Dandelion by a stalked (siipitate) pappus. In Daisy the pappus is obsolete.

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