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GLOSSARY 



AxiLE, located on the axis, i.e., axile 



placentation. 

 Axis, the central line of any organ or 



the support of a group of organs; a 



stem, root, etc. 



Basipetal, applied to structures that 



are produced in succession toward the 



base. 

 Bast, phloem, sometimes the inner 



fibrous portion of the bark. 

 Berry, a fleshy fruit derived from a 



superior ovary consisting of one or, 



more often, two or more carpels. 

 BicoLLATERAL, (of bundlcs) having 



phloem on the outer and inner faces 



of the xylem. 

 Biennial, with a life cycle of two years' 



duration. 

 Blade, the expanded portion of the leaf, 



lamina. 

 Bordered pit, a pit in which the margin 



projects over the closing membrane. 

 Bract, a specialized leaf type commonly 



subtending a flower or an inflores- 

 cence, sometimes cauline. 

 Bud, an unelongated stem tip with its 



lateral members. 

 Bulb, a bud with fleshy leaves, usually 



subterranean. 

 BuLLiFORM CELLS, large, thin-walled 



epidermal cells which occur in certain 



grasses, i.e., corn. 



Caducous, falling off early. 



Callus, (of sieve tube) a deposit on the 

 sieve plates. 



Calyptra, (of root) the root cap. 



Calyptrogen, the layer or histogen 

 from which the root cap is derived. 



Calyx, the outermost cycle of floral 

 parts, the sepals considered collec- 

 tively. 



Cambium, a lateral meristem which pro- 

 duces secondary xylem and phloem. 



Campylotropous, (of ovules) one in 

 which the nucellus is curved and 



the chalaza and micropyle are in a 

 plane at right angles to the funiculus. 



Capillary, slender, hairlike. 



Capitate, shaped like a head. 



Capsule, a dry, dehiscent fruit com- 

 posed of more than one carpel and 

 sometimes involving a portion of the 

 axis. 



Carpel, a simple pistil, or a member of 

 a compound pistil; a megasporo- 

 phyll. 



Carpophore, (in Umbelliferae) a slender 

 extension of the floral axis which 

 supports the two pendulous meri- 

 carps. 



Caryopsis, a fruit developing from a 

 carpel in which the pericarp is adnate 

 to the single seed. 



Casparian strip, a secondary thicken- 

 ing which develops on the radial and 

 end walls of some endodermal cells. 



Cataphyll, bud scales, also applied to 

 the scales on rhizomes and cotyledons. 



Cauline, pertaining to the stem; (of 

 bundles) those which have no direct 

 connection with the common bundles 

 that pass into the leaves. 



Cell, a protoplast which usually con- 

 sists of a nucleus, cytoplasm, and 

 various inclusions; also applied to 

 the cell wall. 



Central cylinder, the vascular system 

 of an axis; the stele. 



Centrifugal growth, from the center 

 outwards. 



Centripetal growth, from the pe- 

 riphery towards the center. 



Chalaza, the point in an ovule or seed 

 where the integuments diverge from 

 the nucellus. 



Chloroplast, a plastid containing 

 chlorophyll. 



Chondriosomes, minute bodies in the 

 cytoplasm having the form of gran- 

 ules, rods, or threads. 



Chromoplast, a plastid containing pig- 

 ment. 



