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The sun flower as a type of flowering plants by Anne B. Jewett, 1890

The Sun Flower as a Type of Flowering Plants by Anne B. Jewett, 1890, Page 21

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18. 2nd Closely adjoining the Sieve-tubes are numerous smaller cells called the [underlined] companion cells. [/underlined] which are smaller sister cells of the segments of the sieve-tubes, cut off during development: III The remaining cells of the [underlined] cambiform [/underlined] or [underlined] phloem-parenchyma [/underlined] resemble the sieve-tubes except that they are smaller and they have no sieve plates. The next later of cells is the [underlined] cambium [/underlined] or active
 
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