816 APPENDIX I 



Loculus, the cavity of an ovary or anther. 



Monocotyledon, a plant having only one seed-leaf. Lilies, 



Crocuses, and many other bulbous and tuberous plants, 



with the Grasses and Rushes, come under this heading; 



cf. Dicotyledon. 

 Monoecious, applied to plants which bear unisexual male and 



female flowers on the same plant. 

 Natural Order, or Family, a collection or group of nearly 



related genera, possessing certain characters in common, 



whereby they can be distinguished from other groups. 



Sometimes the order contains only one genus. 

 Nectar = Honey {q.v.). 



Nectary, an organ secreting honey or nectar (pp. 272, 273). 

 Nitrogenous, containing nitrogen. 



Node, the point of insertion of a leaf on an axis (p. 191). 

 Nut, a dry, indehiscent fruit with a woody pericarp — e.g.^ 



Hazelnut. 

 Offset, the bud formed at the end of a runner or stolon (p. 100). 

 Opposite, applied to leaves which are arranged in pairs at the 



same level on the stem ; cf. Alternate. 

 Organ, a part of a plant which serves a definite function — e,g,y 



a leaf, a stamen. 

 Ovary, the female portion of the flower, consisting of one or 



more closed carpels, enclosing one or more ovules. 

 Ovule, the female organ enclosed in the ovary, which when 



fertilised becomes a seed. 

 Panicle, a branched raceme {q-v.). 

 Pappus, the hairs or scales developed at the summit of the 



fruits of many Compositae. Derived originally from the 



calyx — e.g.^ Dandelion fruits. 

 Parasite, a plant living in or on another plant (the host), from 



which it derives part or all of its food-supply (p. 287). 

 Parthenogenesis, the development of an embryo from an ovule 



without fertihsation (p. 279). 



