782 GLOSSARY. 



Crystal Sand (Kristallsand). Same as micro-crystals (p. 188). 

 Crystalloid. Resembling a crystal, formerly applied to the phyto-globulin 



of the aleurone grain (p. 193). 

 Cucullate. Having the shape or resembling a hood as the sepals of 



aconite (p. 383). The term galeate, however, is more commonly 



employed to describe a hood-like corolla. 

 Culm. The jointed and usually hollow stem of grasses and sedges (p. 



466). 



Cuneate. Wedge-shaped. Applied to the leaf or leaf-like organs. 

 Cuspidate. An apiculate leaf in which the projecting midrib is sharp 



and rigid. 

 Cyme. A convex or flattened flower cluster, in which the flower at the 



summit of the primary axis matures first (p. 395). 

 Deciduous. Falling after a definite period of growth. Applied to leaves 



and leaf-like organs (p. 388). Also applied to trees the leaves of 



which are not evergreen. 

 Decompound. Applied to compound leaves, the divisions of which are 



compounded a second time. 



Decumbent. Prostrate stems or branches having an ascending summit. 

 Decurrent. Extending below the point of insertion, as the leaves of 



Crotalaria sayitlalis. 

 Dehiscence. The opening of an organ, as a capsule, for the discharge of 



its seed (p. 411). Also applied to anthers for the discharge of pollen, 



and the sporangia of ferns at the time of discharge of the spores 



(p. 90). 



Deltoid. Triangular. The sides being nearly equal. 

 Dentate. A margin having tooth-like divisions (p. 356). 

 Denticulate. Diminutive of dentate. 

 Depressed. Sunk below the margin. 

 Dichotomous. Two-parted ; divided into pairs, as the forking thallus of 



Chondrus (p. 33). 

 Didynamous. Applied to flowers of the Labiatse having two sets of 



stamens of unequal length (p. 381). 

 Digitate. Having deep, finger-like, radiating divisions. 

 Dimorphous. Existing in two forms as the flowers of the partridge berry 



(p. 391). 

 Dioecious. Applied to plants in which the staminate and pistillate flowers 



are borne on separate individuals, as the Salicaceae (p. 508). 

 Discoid. A head composed only of tubular flowers, as in some of the 



Composite (p. 711 ). 

 Disk (Disc). An enlargement of the torus situated at the base of or 



around the pistil and usually secreting nectar (pp. 120 and 402). Also 



applied to the central portion of the headsi of the Compositse which 



bear the tubular flowers. 

 Dissepiment. The walls between the locules of a syncarpous gynaecium 



(p. 378). 



Dorsal Pneumatic Tissue. The loose mesophyll of the leaf (p. 366). 

 Dorsiventral. Having unlike lower (dorsal) and upper (ventral) sur- 

 faces (p. 366). f 

 Drupe. A fleshy, indehiscent fruit, having a more or less succulent 



sarcocarp and hard endocarp (p. 418). 

 Driizen. A secreting or glandular cell. 

 Driizenzotten. Same as glandular hairs (p. 222). 

 Duct (Trachea or Vessel). A conducting cell of the hadrome or xylem 



(p. 273). 



Echinate. Beset with sharp elevations like prickles or spines (p. 354). 

 Egg or Egg Cell. The female gamete (pp. 5 and 124)., 



