202 GLOSSARY 



Involucre A whorl of bracts beneath a flower or an inflorescence. 

 Irregular (of a flower) Where the petals are not all alike. 



Labellum (in Orchideae) One of the petals which is usually much 



larger than the others. 

 Latex A milky juice formed in special receptacles (Papaver, Son- 



chus. Euphorbia). 

 Legume A dehiscent seed-vessel splitting down both back and 



front (Leguminosce). 

 Ligule (in grasses) A small appendage to the leaf at the point 



where it springs from the stem. 

 Loculus A division or chamber of the ovary. 



Male (of flowers) Having stamens but no pistil. 



Mericarp Each half of a cremocarp ( Umbelliferce). 



Monadelphous (of stamens) The filaments all more or less cohe- 

 rent (Leguminosce). 



Monoecious Having male and female flowers on the same indivi- 

 dual (Hazel]. 



Mucronate (of leaves) When the mid-rib projects beyond the leaf 

 like a tooth. 



Nectary Any organ that secretes nectar. 



Node (of stems) The zone from which one or more leaves spring. 



Nutlet A small dry indehiscent fruit (Borragineoe). 



Ochrea A stipule-like structure forming a sheath round the stem 



(Polygonacece). 



Ovary The lower part of the pistil containing the ovules. 

 Ovule A rudimentary seed. 



Pale (in grasses) An inner bract, from the axil of which springs a 



flower. 



Panicle A branched raceme (Graminece). 

 Pappus The crest of silky hairs into which the calyx is sometimes 



transformed (Composites). 

 Parasite A plant which obtains its sustenance from the living 



tissues of another plant (Dodder, Mistletoe). 



