GLOSSARY 



Mainly for non-botanists. Gives only the sense in which the words are used in this work. 



Abortive. Imperfecdy developed. 



Acuminate. Gradually diminishing to a drawn- 

 out point. 



Acute. Sharply pointed, but not drawn out. 



Adherence, adherent. The union by adhesion of 

 two different kinds of organs, e.g. sepal to 

 petal ; of. Coherence. 



Adpressed. Pressed flat against. 



Adventitious roots. Those springing direct from 

 the stem. 



Adventive. Introduced, not native. 



Albumen. Nutriment stored in the seed for 

 nourishment of the young seedUng. 



Alternate. Placed opposite the spaces between 

 the members of the next whorl of a flower; in 

 the case of leaves placed alternately on opposite 

 sides of tlie stem. 



Amplexicaul. Embracing or sheathing the stem. 



Anastomosing. Union of one vein with another 

 — net-veining. 



Anther. The part of a flower which produces 

 the pollen, usually z-celled and stalkless in 

 orchids; when attached to a filament (stalk), 

 the two together constitute a stamen. 



Apex. The end furthest from the point of attach- 

 ment. 



Auricle. A httle ear-shaped lobe. 



Axil. The upper angle between stem and leaf. 



Axile. Belonging to the axis. 



Axis. An imaginary line round which the organs 

 of a plant or flower are placed. 



Base. The end of an organ nearest the point of 



attachment. 

 Bifid. Divided half-way into two lobes. 

 Bipartite. Divided nearly to the base. 

 Bracts. Small leaves from the axil of which the 



flower springs. 



Callus. An abnormally thickened part. 



Capsule. A dry many-seeded dehiscent seed- 

 vessel. 



Channelled. Folded or upcurved, forming a 

 gutter. 



Chlorophyll. The green colouring matter of 

 leaves, etc. 



Ciliate. Fringed with hairs. 



Clavate. Club-shaped. Thickened upwards from 

 a slender base. 



Clinandrium. A shallow cup at the apex of the 

 column, in which the polUnia are deposited in 

 Epipactis, etc. 



Coherence, coherent, cohering. Adhesion of two 

 organs of the same kind, e.g. sepal to sepal. 



Confluent. Blended into one, e.g. the stigmas 

 of many orchids. 



Conical. Tapering upwards, in transverse sec- 

 tion circular. 



Connate. Firmly united. 



Connective. The membrane connecting the two 

 ceUs of an anther. 



Connivent. Converging together. 



Cordate. Heart-shaped. 



Cortex. Bark. The ground tissue between the 

 stele and epidermis. 



Cotyledon. A seed-leaf, of which monocotyledons 

 have one, and dicotyledons two. 



Crenate. With rounded teeth — scalloped. 



Crenulate. Minutely crenate. 



Cuneate. Wedge-shaped. 



Cylindric. Elongated, with a circular cross-sec- 

 tion. 



Deciduous. Falling off in due season. 



Decurrent. Prolonged down the stem, Uke the 

 mid-rib and often the edges of bracts. 



Dehiscence. The opening of an anther or of a 

 seed-capsule by slits or valves. 



Deltoid. Triangular, with nearly equal sides. 



Dentate. Toothed. 



Denticulate. Minutely toothed. 



Diagnosis. A summary of the important cha- 

 racters of a species, genus, tribe, etc. 



Diandrous. Having two anthers. 



Dicotyledon. Plant having a pair of seed-leaves 

 (cotyledons). 



Dicotyledonous. Having a pair of seed-leaves. 



Disc, viscid. Darwin's term for the disc-like 

 membrane, very sticky beneath, to the top of 

 which the poUinia are attached by their 

 caudicles in Orchis, Ophrys, etc. The viscidium. 



Distichous (of leaves). Arranged alternately one 

 above another in two opposite rows. 



Divergent. Gradually separating so as to form 

 an angle with each other. 



Dorsal. Belonging to the back. 



Dorsally compressed. Compressed from back to 

 front. 



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