326 GLOSSARY OP TERMS. 



Dentate Having sharp, nearly straight incisions in the margin 

 of the leaf. 



Didynamous Having two stamens longer than the other two, 

 as in plants of the Labiates and Scrophulariacece. 



Digitate Having five or more narrow segments, as in the leaf 

 of the Lupin. 



Disc The name given to a growth between the stamens and 

 the pistil, as in the Ruta graveolens and to the centre of 

 flowers in Composites. 



Disciform Shaped like a disc. Applied to the circular de- 

 pressions on a rhizome where a deciduous stem has arisen, 

 as in Solomon's Seal. 



Efflorescence Covered with a fine powder, which is not 



permanent. 



Elliptic Shaped like an ellipse. 

 Emarginate Having an indentation at the apex of the leaf. 



Embryo The young plant in the seed, consisting of one or two 

 cotyledons with a minute leaf-bud above, and a minute root 

 below. 



Endocarp The inner layer of the fruit, corresponding to the 

 inner surface of the carpel (which, like the leaf, has three 

 layers). In the Plum the endocarp forms the stone, the 

 inner layer or mesocarp forms the flesh, and the outer or 

 epicarp forms the skin. 



Entire Not toothed at the margin. 



Epidermis The skin of the leaf. In the Windsor Bean leaf it 

 can easily be peeled off. 



Exfoliating Splitting off in layers like the bark of the Plane 

 Tree and Sycamore. 



Falcate Curved like a scythe blade. 



Feather-veined Having the lateral veins proceeding straight 

 to the margin, as in the leaf of Rhamnus Frangula. 



Female plant When the male and female flowers are on 

 distinct plants. This arrangement is called dioicous, and 

 when on separate flowers on the same plant, monoicous. 



Filiform Thread-shaped. 



Florets or flowerlets Applied to the central flowers in the 

 flowerheads of the Composite. The central tubular florets 

 are distinguished as florets of the disc, and the outer strap- 

 shaped ones as florets of the ray. 



Flowerheads An arrangement of flowers in a compact group 

 surrounded usually with several rows of bracts. See In- 

 volucre and Phyllaries. 



Fluorescence Applied to liquids which present two different 

 colours when viewed at different angles. 



