GLOSSARY 



<y}(PJ^ 



<L^ 



FIQ. 46.— DBHIBCENCE. 



Deflexed, curved downwards or towards the 

 back. 



Dehiscence, the mode in which an ovary or 

 fruit opens to shed its 

 seeds. Fig. 46 shows 

 various ways in which 

 the pods open ; a is 

 called loculicidal, and 

 6 septifragal dehi- 

 scence. 



Deltoid, fleshy with a 

 triangular transverse 

 section. 



Dentate, with short 

 triangular teeth, as on the margins of many 

 leaves. 



Denticulate, finely toothed, like the Camellia 

 leaf. 



Depressed, when flattened at the top, like 

 many Apples, Onions. 



Di, in compounds, signifies two, as diandrous, 

 2 stamens. 



Diadelphous, stamens in two bundles or 

 fascicles, as in some Legu- 

 minous flowers (fig. 47). 



Dichlamydeous, having 

 both calyx and corolla, as 

 in most of the flowers 

 described between p. 131 

 and p. 759. 



Dichotomous, when a 

 branch, stem, or flower- 

 stalk is much forked in 

 pairs. 



Diclinous, the same as 

 Unisexual, when stamens and. pistils are 

 in different flowers. 



Dicotyledonous, said of plants having two 

 seed-leaves, and afterwards net-veined 

 leaves &b., as explained at p. 122. Fig. 

 48 shows a seedling dicotyledon : r shows 

 the true roots ; h the hypoootyl or part 

 between the true root and true stem ; c 

 the cotyledons or seed-leaves ; a, the first 

 pair of true net-veined leaves, and p the 

 first true bud after the original one called a 

 plumule. 



¥ia. 47.— 



DIADELPHOUS. 



riG. 48.— DICOTYLEDON. PIQ. 49.— niDTNAMOUS. 



Didynamous, having four stamens, two 

 shorter than the others, as in many plants 

 of the Labiate order (fig. 49). 



Digitate, fingered leaves or lobes all start- 



ing from the top of the petiole, as the 

 leaves of the Lupin, Horse Chestnut &o. 

 (fig. 50). 

 Dimidiate, the two halves of an organ very 



FIG. 50. — DIGITATE. 



EIG. 61.— DIMIDIATE. 



unequal in size, like the leaves of Begonias, 

 Lime trees &o. (fig. 51). 



Dicecious, with the different sexes on 

 different plants: stamens on one plant, 

 pistils on another, as in Willows, Aucubas, 

 Hippophae <ji:c. 



Disc, a fleshy surface from which the 

 stamens and pistils spring. The term ' disci- 

 florffi ' has been applied to a large class of 

 plants having these characters (p. 123). 

 Disc florets are the central flowers in Com- 

 posite plants like Daisy, Marguerite <fec. 



Dissected, deeply divided into many narrow 

 lobes, like the lea'vea of Umbelliferous 

 plants, Thaliotrums &c. 



Dissepiments, the partitions of an ovary or 

 fruit, as shown in fig. 46. 



Distichous, arranged in two opposite rows, 

 as the leaves of Taxodium distichum 

 (p. 983). 



Divaricate, spreading at an obtuse angle. 



Drupe, a fleshy fruit 

 having a hard stone 

 (putamen or endocarp, 

 shown at s), as the 

 Cherry, Plum, Peach 

 &c. (fig. 52). m repre- 

 sents the fleshy edible 

 portion called meso- 

 carp, and e the skin or 

 epicarp. See Pome, 

 fig. 88. 



Duramen, the heartwood 

 or centre of Dicotyledonous trees, and the 

 outer part of the stem of Monocotyledo- 



Echinate, clothed with spines or prickles, 

 like the fruit of the Sweet Chestnut. 



Elliptic, oval, but pointed at each end. 



Elongate, much lengthened. 



Emarginate, slightly notched at the end, as 

 in the case of many leaves (fig. 53). 



Embryo, the germ of a plant in the seed 

 (see p. 24). 



