GLOSSARY OF SPECIAL TEEMS. 



557 



Ochroleucous. Yellowish white. 



Olivaceous, Olive-green. 



Oosphere. The cell of the archegone 



which is fertilized by spermato- 



zoids. 



Operculate. With an operculum. 

 Operculum. A lid. 

 Orbicular. Approximately circular in 



outline. 

 Orthotropous. Term applied to the 



straight ovule, having the hilum at 



one end and the micropyle at the 



other. 



Ostiole. A little orifice. 

 Ovary. The ovule-bearing part of the 



pistil. 

 Ovate. In outline like a longitudinal 



section of a hen 's egg. 

 Ovoid. Shaped like a hen 's egg. 

 Ovule. The macrosporange of flower- 

 ing plants, becoming the seed on 



maturing. 

 Palate. The projection from the 



lower lip of two-lipped personate 



corollas. 

 Palet. A bract-like organ enclosing 



or subtending the flower in grasses. 

 Palmate. Diverging radiately like 



the fingers. 

 Panicle. A compound flower-cluster 



of the racemose type, or cluster of 



sporanges. 



Paniculate. Borne in panicles or re- 

 sembling a panicle. 

 Papilionaceous. Term applied to the 



irregular flower of the Pea Family. 

 Papillose. With minute blunt pro- 

 jections. 

 Pappus. The bristles, awns, teeth, 



etc., surmounting the achene in the 



Chicory and Thistle Families. 

 Parasitic. Growing upon other plants 



and absorbing their juices. 

 Parietal. Borne along the wall of the 



ovary, or pertaining to it. 

 Parted. Deeply cleft. 

 Patent. Spreading, open. 

 Pectinate. Comb-like. 

 Pedicel. The stalk of a flower in a 



flower-cluster, or of a sporange. 

 Peduncle. Stalk of a flower, or a 



flower-cluster, or a sporocarp. 

 Pedunculate. With a peduncle. 

 Peltate. Shield-shaped ; a flat organ 



with a stalk on its lower surface. 

 Penicillate. With a tuft of hairs or 



hair-like branches. 



Perfect. Flowers with both stamens 

 and pistils. 



Perfoliafe. Leaves so clasping the 

 stem as to appear as if pierced by it. 



Perianth. The modified floral leaves 

 (sepals or petals), regarded collec- 

 tively. 



Pericarp. The wall of the fruit, or 

 seed-vessel. 



Pericentral. Surrounding the central 

 axis. 



Perigynium. The utricle enclosing 

 the ovary or achene in the genus 

 Carex. 



Perigynous. Borne on the perianth, 

 around the ovary. 



Peripheral. Pertaining to the periph- 

 ery. 



Perithecium (Perithecia). An organ 

 containing spore-sacs. 



Persistent. Organs remaining at- 

 tached to those bearing them after 

 the growing period. 



Petal. One of the leaves of the co- 

 rolla. 



Petaloid. Similar to petals; petal- 

 like. 



Petiolate. With a petiole. 



Petiolule. The stalk of a leaflet. 



Petiole. The stalk of the leaf. 



Phyllode. A bladeless petiole or 

 rachis. 



Pilose. With long soft hairs. 



Pinna. A primary division of a pin- 

 nately compound leaf. 



Pinnate. Leaves divided into leaflets 

 or segments along a common axis. 



Pinnatifid. Pinnately cleft to the 

 middle or beyond. 



Pinnule. A division of a pinna. 



Pistil. The central organ of a flower 

 containing the macrosporanges 

 (ovules). 



Pistillate. With pistils; and usually 

 employed in the sense of without 

 stamens. 



Placenta. An ovule-bearing surface. 



Plicate. Folded into plaits, like a 

 fan. 



Plumose. Eesembling a plume or 

 feather. 



Plumule. The rudimentary terminal 

 bud of the embryo. 



Pluril ocular. Having many cells or 

 compartments. 



Podetium (Podetia). Stalk-like or- 

 gans in certain lichens. 



