. The Pharmaceutical era. Spike. Head.—lu the Sunflower and other Compositse (), the flowers are borne directly on the receptacle. Inthe Compositce the inflorescence is subtended by an in-volucre, whereas in Clover. Cephalanthus. etc., the in-florescence is destitute of any. Such an inflorescence, asin the Button-bush CCephalanthus) or any Compositse, isspoken of as a Head. Catkin.—In the willow, birch, etc., we find a spike,with this peculiarity, that scaly bracts are produced atthe base of the individual flowers. Such a form of in-florescence is spoken of as a Catkin or Ament. Fig. 8S.
. The Pharmaceutical era. Spike. Head.—lu the Sunflower and other Compositse (), the flowers are borne directly on the receptacle. Inthe Compositce the inflorescence is subtended by an in-volucre, whereas in Clover. Cephalanthus. etc., the in-florescence is destitute of any. Such an inflorescence, asin the Button-bush CCephalanthus) or any Compositse, isspoken of as a Head. Catkin.—In the willow, birch, etc., we find a spike,with this peculiarity, that scaly bracts are produced atthe base of the individual flowers. Such a form of in-florescence is spoken of as a Catkin or Ament. Fig. 8S.—Diagram of the Raceme Inflorescence in Poke(Phytolacca decandra.) (p) Petiole of the Inflorescence; (pe) fiedlcel or stalli of individual flowers; (b) bracts or modifledeaves; (r> rhachis, being the axis of the inflorescence. Fig. 84.—Diagram of a Corymb as illustrated In theCherry inflorescence. The letters have the same significanceas Fig. 83. Fig. 85.—Diagram of an Umbel as found in Onion, Milk-weed, Cussowe observe a com-pound raceme, i. e.,instead of producingbut single flowersalong the rhachis,additional clustersof flowers are pro-duced in place ofeach flower. Suchan inflorescence iscalled a Panicle(Fig. 87). If we examine the flower clusters of the morning glory,dogwood, heliotrope, peppermint, we observe differentforms of Determinate or Definite Inflorescence. Cyrac.—Whenever the main axis of the stem or itsbranch is terminated by a flower, the inflorescence isspoken of as iKing cymose. In its simplest case a stemterminated by .-i .single flower is a cyme. In the morningglory (Fig. 88) we have a cymose inflorescence consistingof three to five flowers. Compound Cj/mc—Whenever the pedicle of a cymebecomes a peduncle it passes from a simple to a com-pound cyme, as in Elder, Hydrangea, Viburnums, etc.
Size: 1297px × 1926px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksubjectdrugs, booksubjectpharmacy, bookyear1
