. Plants and their uses; an introduction to botany. Botany; Botany, Economic. f-/-A Fig. 382.—Climbing Buckwheat {Polygonum Conrolcuius. Buckwheat Family, PolygotiacecF). Pistil (Y) during fertilization, cut vertically to show stalk-like base (fs) of ovary; stalk of ovule (fu); end of stalk (cha); the nucellus (nii), the micropyle, or opening to the nucellus {mi); the inner integument (ii); the outer integument (ie); the embrj^o-sac (e); nucleus of the embryo-sac (ck); the eg^-apparatus (t?) consisting of three cells, the lower one being the egg-cell and the two others com- panion cells which
. Plants and their uses; an introduction to botany. Botany; Botany, Economic. f-/-A Fig. 382.—Climbing Buckwheat {Polygonum Conrolcuius. Buckwheat Family, PolygotiacecF). Pistil (Y) during fertilization, cut vertically to show stalk-like base (fs) of ovary; stalk of ovule (fu); end of stalk (cha); the nucellus (nii), the micropyle, or opening to the nucellus {mi); the inner integument (ii); the outer integument (ie); the embrj^o-sac (e); nucleus of the embryo-sac (ck); the eg^-apparatus (t?) consisting of three cells, the lower one being the egg-cell and the two others com- panion cells which arc thought to represent rudimentary archegonia; prothallial cells (an); style (g); stigma (».); pollen grains (p); and pollen-tubes (ps). A pollen grain falling upon the stigma produces a tube which grows down through the style, enters the micropyle, and penetrates to the ogg-cell; here it discharges its (male) nuclcu.'^ which fuses with the nucleus of the egg-cell and from this union an embryo arises. (Strasburger.)—The plant is an annu;it \'ine rcsem1iling l^iuck- whcat but with greenish flowers; native to JMimpc but a rimimon weed in America. Fig. 383.—Shepherd's Purse (CapscUa Bursa-pastoris, Mustard Family, Cruciferce). Development of the embryo. A-D, successive stages, much magnified, showing the suspensor (*'/), lc)wer end of embryo {h), cotyle- dons (<:), and the stem-tip (p) from which the plumule arises. (Han- stein.)—The plant is annual, about 50 cm. tall, with small white flowers and dry fruit; native of Europe; common as a weed in 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 Sargent, Frederick Leroy, 1863-. New York, H. Holt and Company
Size: 1064px × 2348px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
