GLOSSARY 129 



Lacerate. Having the margin roughly cleft, as if torn. 



Lanceolate. Said of leaves shaped like a lance-head, several times longer than 

 wide. 



Lenticel. The spongy pores in bark which permit transfusion of gases. Espe- 

 cially conspicuous in birch. 



Lyrate. Pinnately cleft, the terminal lobe being rounded and conspicuously larger 

 than the others. 



Membranous. Thin, dry, and more or less translucent. 



Monadclplwus. Said of stamens which are united by their filaments into a tube 



or column. 

 Monoecious. Said of plants having staminate and pistillate flowers on the same 



individual. 



Ob-. A prefix giving the idea of inversion. 



Obcordate. Inverted heart shape, said of leaves with the broad part of the heart 



away from the stem. 

 O&ovate. Inverted ovate. 

 Obovoid. Inverted ovoid. 

 Obscurely toothed. Very slightly toothed. 

 Obtuse. Blunt or rounded at the end. 

 Ovate. Egg-shaped. Said of leaves with an outline like an egg with the broader 



end down. 

 Ovoid. Nearly oval in outline. 



Palmate. Said of leaves which are radiately lobed or divided, suggestive of the 

 palm and fingers of the hand. 



Panicle. A loose and irregularly compound inflorescence whose flowers are on 

 pedicels. 



Papilanaceous. Said of corollas like that of pea and of many other Leguiminosae., 



Papillose. Bearing minute, nipple-shaped projections. 



Pappus. The modified calyx of Compositae. It forms a crown of various char- 

 acter at the top of the achene. 



Pedicel. The stalk of a single flower. 



Peduncle. A primary flower-stalk, supporting either an inflorescence or a soli- 

 tary flower. 



Perennial. Lasting year after year. 



Perfect. Said of flowers which have both kinds of essential parts, i. e., stamens 

 and carpels. 



Perfoliate. Said of leaves through which the stem appears to pass. 



Perianth. The accessory parts of a flower, *. e., calyx and corolla. 



Perigynous flowers. Those intermediate in structure between hypogyny and epig- 

 yny; the calyx adnate to the ovary. 



Pinna. One of the divisions of a pinnate leaf. 



Pinnate leaves. Compound, divided into pinnae, on the plan of a feather; the 

 leaflets arranged on each side of a common petiole. 



Pinnatifid. Pinnately cleft. 



Pinnule. A secondary pinna of a decompound leaf. 



Pistillate flowers. Flowers with pistil, but no stamens. 



Placenta. Any part of the interior of the ovary which bears ovules. 



Polygamo-dioecious. Said of plants which, like the maples, are polygamous, with 

 a tendency to be dioecious. 



Polygamo-monoecious. Polygamous with a tendency to be monoecious. 



Polygamous. Said of plants which produce both perfect and imperfect flowers. 



SPRING FLOI.A 9 



