GLOSSARY. 175 



Hybrid. A cross between two species. 



Imbricated. Overlapping. 



Inflorescence. Mode of disposition of flowers ; sometimes applied to 

 the flower-cluster itself. 



Involucre. Bracts subtending a flower or a cluster of flowers. 



Keeled. Having a central dorsal ridge like the keel of a boat. 



Key. A winged fruit ; a samara. 



Lacerate. Irregularly cleft, as if torn. 



Lanceolate. Lance-shaped, broadest above the base, gradually nar- 

 rowing to the apex. 



Leaf. Consisting when botanically complete of a blade, usually flat, 

 a footstalk and two appendages at base of the footstalk ; often 

 consisting of blade only. 



Leaf, compound. Having two to many distinct blades on a common 

 leafstalk or rachis. These blades may be sessile or have leaf- 

 stalks of their own. 



Leaf, pinnately compound. With the leaflets arranged along the 

 sides of the rachis. 



Leaf, palmately compound. With leaflets all standing on summit of 

 petiole. 



Leaf-cushions. Organs resembling persistent decurrent footstalks, 

 upon which leaves of spruces, etc., stand ; sterigmata. 



Leaf-scar. The scar left on the twig where the petiole was attached. 



Lenticel. Externally appearing upon the bark as spots, warts, and 

 perpendicular or transverse lines. 



Linear. Long and narrow with sides nearly parallel. 



Monopetalous. Having petals more or less united. 



Mucronate. Abruptly tipped with a small, sharp point. 



Nerved. Having prominent unbranched ribs or veins. 



Obcordate. Inversely heart-shaped. 



Obovate. Ovate with the broader end towards the apex. 



Obtuse. Blunt or rounded at the end. 



Orbicular. Having a circular or nearly circular outline. 



Ovary. The part of the pistil containing the ovules. 



Ovoid. A solid with an oval or ovate outline. 



Ovuliferous. Bearing ovules. 



Panicle. General term for any loose and irregular flower-cluster, 

 commonly of the racemose type, with pedicellate flowers. 



Pedicel. The stalk of a single flower in the ultimate divisions of an 

 inflorescence. 



Peduncle. The stem of a solitary flower or of a cluster. 



