. Botany all the year round; a practical text-book for schools. Botany. UNDERGROUND STEMS 131 Place a cutting of rose geranium or of coleus in a pot of moist sand. As soon as the roots begin to form, examine the stem with a lens to see from what portion they spring. 271. — New stocks with adventitious roots produced by layering. — whether from near the circumference, or from the cen- ter. What part of the stem should you infer from this, is most actively concerned in the work of growth ? PRACTICAL QUESTIONS 1. Do the adventitious roots of sucli climbers as ivy and trumpet vine draw any nourish
. Botany all the year round; a practical text-book for schools. Botany. UNDERGROUND STEMS 131 Place a cutting of rose geranium or of coleus in a pot of moist sand. As soon as the roots begin to form, examine the stem with a lens to see from what portion they spring. 271. — New stocks with adventitious roots produced by layering. — whether from near the circumference, or from the cen- ter. What part of the stem should you infer from this, is most actively concerned in the work of growth ? PRACTICAL QUESTIONS 1. Do the adventitious roots of sucli climbers as ivy and trumpet vine draw any nourishment from the objects to which they cling? 2. How do you know this? 3. Do they injure trees by climbing upon them; and if so, how? 4. What is the use of the aerial roots of the scuppernong grape? 5. Is the resurrection fern (Polypodium incanum) a parasite or an air plant? 5. On what plants in your neighborhood does mistletoe grow most abundantly ? Dodder ? 7. Is mistletoe injurious to the host? 8. Name some plants that are propagated mainly, or solely, by roots and cuttings. UNDERGROUND STEMS Material. — Underground stems of couch grass, nut grass, violet, iris, or any rootstocks obtainable. In cities, if nothing better is to be had, some dried orris root or calamus might be obtained from a drug- gist. Any kind of tuber, such as potato, artichoke, Madeira vine, etc. A sweet potato. A scaly lily bulb and one of onion or hyacinth. Pota- toes and sweet potatoes treated with red ink. 188. Rootstocks. — So like fleshy roots are certain thick- ened underground stems that it is not always easy to dis- tinguish between them. So long as the stem remains above. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Andrews, Eliza Frances, b. 1840. New York, Cincinnati [etc. ] American book company
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