GLOSSARY OF SPECIAL TERMS. 



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. Appro>dmately 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 bris-tles, 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. 

 Perfoliate. 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. 

 Perigynoiis. Borne on the perianth, 



around the ovary. 

 Peripheral. Pertaining to the i)eri])li- 



ery. 

 Perithecium (Pcrithecia). An organ 



containing spore-sacs. 

 Persistent. Organs remaining at- 

 tached to tho^e 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 bej'ond, 

 Pinnide. A division of a pinna. 

 Pistil. The central organ of a flower 



containing the macrosjioranges 



(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. Resembling a plume or 



feather. 

 Plumule. The rudimentary terminal 



bud of the embryo. 

 Plurilocular. Having many colls or 



compartments. 

 Podetium (Podctia). Stalk-like or- 

 gans in certain lichens. 



