File:American forestry (1910-1923) (17956772978).jpg

Title: American forestry
Identifier: americanforestry231917amer (find matches)
Year: 1910-1923 (1910s)
Authors: American Forestry Association
Subjects: Forests and forestry
Publisher: Washington, D. C. : American Forestry Association
Contributing Library: The LuEsther T Mertz Library, the New York Botanical Garden
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

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26 a.mi«:rka.\ forestry C.Whitney—a very good book to have on your botanical bookshelf. When you come across this species, cither in an illustration or in the field—^it is usually found in July, i,'ro\v- ing on a shady bank or in moist places elsewhere—note its big, oval leaves, sharp-pointed at both ends. Sometimes these leaves are half a foot long by three inches in width, their margins being smooth in outline, and not indented or notched in any manner whatever. The strong mid-rib is always conspic- uously developed, the leaf itself being a beautiful clear green color above and lighter beneath. If you handle one, you will find it is soft to the touch and fine in texture. Oc- casionally you will find the mid-rib pinkish above, and this is sometimes the case with other plants of this group. But we must par- ticularly study the way in which the leaves spring from the main stem. Here in this poke milk- weed, they are in pairs, and as we go up or down the stem, we find each succes- sive pair placed at right angles to the pair above or below it. In one hand- some species of our m i 1 k w e e d s — the four-leaved m i 1 k - weed (A. quadri- folia)—the leaves at the middle of the stalk or stem are arranged in a circle, while above, the leaves are smaller and narrower and arranged only in pairs. The flowers of this species are of a magenta-pink shade and very beautiful. Students of this assemblage of plants have paid especial
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PODS OF THE BUTTERFLY WEED MAKING GOOD FOR AXOTHER YEAR Fig. S.—What was said in the legend beneath Figure 4 applies, in large part, to what we see here of the bursting seed-pods of the lovely butterfly-weed (A, ttibcrnsa). In several places the e.xact form in the seeds is well shown here, as well as their arrangement and disposition in the interior of tlie pod. Observe that the latter are supported on tu'ht stems, and in many instances both pods may mature and contain their usual quota of seeds. '1 hese iatierarelightly attached to theirsilken appendages; and I am inclined to believe that some of them at least may be detached before the silk has an opportunity to escape from its prison. An example of this is seen in the open pod facing the front at the upper right hand side of the illustration. We have still much to learn along these lines, and there is beautiful material here for boys and girls to study at home, as well as under their nature instructors in the schools. attention to the leaves of the various species, and this is a matter of considerable importance. Leaves of the differ- ent milkweeds vary in the several particulars of size, form, and color; they are also arranged on the stems in divers ways in the case of the several species. As a matter of fact, this variance is so great that the best way to study these vari- ations will be to collect, next summer, as many of the milk- weeds as possible, ( ))rcssing them care- fully; you will find that you have a nice lot of material to stiidy during the long winter even- ings of 1917-1918. You should have at hand a copy of the last edition of Gray's New Manual of Botany (illus- trated) ; in it the leaves of most of our milksveeds are briefly described. When collecting these plants, be sure to take home the entire plant, includ- ing the root. This is important in the case of the milk- weeds especially; for, from one end to the other, the leaves in many species vary in all particu- lars,—that is, with respect to position, number, color, form, structure, and size. Many of the species bear scien- tific specific names that invite attention to the leaves, as in the case of ^4. lanceo- lata, wherein the leaves are some- times almost linear in fonn, or elongo- lanccolatc. Others arc the already nu'iUioiicd four- leaved milkweed (A. qiiadri/olia), the oval-leaved m i 1 k - weed (.4. ovalijolia), and so on. Mrs. Dana, in

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