This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 Excerpt: ...head, sometimes directly to its eyes, and the pollen masses are torn out. These masses are then carried to the next flower and are thrust against the stigma in the attempt to get the nectar. In the lady-slipper (Cypripedium), another orchid, the flowers have a conspicuous pouch (see Fig. 137), in which the nectar is ...
Read More
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 Excerpt: ...head, sometimes directly to its eyes, and the pollen masses are torn out. These masses are then carried to the next flower and are thrust against the stigma in the attempt to get the nectar. In the lady-slipper (Cypripedium), another orchid, the flowers have a conspicuous pouch (see Fig. 137), in which the nectar is secreted. A peculiar structure, like a flap, overhangs the opening of the pouch, beneath which are the two anthers, and between them the stigmatic surface (see Fig. 138). Into the pouch a bee crowds its way and becomes imprisoned (see Fig. 139). The nectar which the bee obtains is in the bottom of the pouch (see Fig. 140). When escaping, the bee moves towards the opening overhung by the flap and rubs first against the stigmatic surface (see Fig. 141), and then against the anthers, receiving pollen on its back (see Fig. 142). A visit to another flower will result in rubbing some of the pollen upon the stigma, and in receiving more pollen for another flower. Fig. 139. A bee imprisoned in the pouch (partly cut away) of Cypripedium.--After Girson. Fig. 140. A bee obtaining nectar in tbe pouch of Cypripedium.--After Girson. In cases of protandry, as the common figwort, flowers in the two conditions will be visited by the pollinating insect, and as the shedding stamens and receptive stigmas occupy the same relative position, the pollen from one flower will be carried to the stigma of another. It is evident that exactly the same methods prevail in the case of protogyny, as the fireweed (see Pig. 134). The Houstonia (see Fig. 135), in which there are starnens and styles of different lengths, is visited by insects whose bodies fill the tube and protrude above it. In visiting flowers of both kinds, one region of the body receives pollen from the short sta...
Read Less
Choose your shipping method in Checkout. Costs may vary based on destination.
Seller's Description:
Good. No dust jacket. Lightly worn green cloth boards stamped on cover and with clear gilt titling on spine which is mildly bumped at tips; binding firm, page edges lightly tanned and soiled, text interior bright unmarked. 264 p. Includes: illustrations, index. Part of the Twentieth Century Text-books from the publisher, the first of three by this author, who also wrote Plant Studies as well as Plant Structures Hardbound small 8vo (about 7.75 inches tall) 264 pages. Index. Description: Features 206 black and white figure illustrations; some of these are full page photographs, some simple line drawings, plus many detailed drawings. In his career in education administration, Coulter is notable for serving as the president of Indiana University and Lake Forest College and the head of the Department of Botany at the University of Chicago.