I 10O 



GLOSSARY OF SPECIAL TERMS. 



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 spo- 

 ranges. 



Paniculate. Borne in paniclts or re- 

 sembling a panicle. 



Papilionaceous. Term applied to the 

 irregular flower of the Pea Family. 



Papillose. With minute blunt projec- 

 tions. 



Pappus. The bristles, awns, teeth, etc., 

 surmounting the achene in the Chic- 

 ory 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. 



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. 



Perigynium. The utricle enclosing the 

 ovary or achene in the genus Carex. 



Perigynous. Borne on the perianth, 

 around the ovary. 



Peripheral. Pertaining to the peri- 

 phery. 



Persistent. Organs remaining attached 

 to those bearing them after the grow 

 ing period. 



Petal. One of the leaves of the cor- 

 olla. 



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. 

 Pinnatijid. 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 sta- 

 mens. 



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. 



Pollen. Pollen grain. See Microspore. 

 Pollinia. The pollen-masses of the Or- 

 chid and Milkweed Families. 

 Polygamous. Bearing both perfect and 



imperfect flowers. 



Polypetalous. With separate petals. 

 Pome. The fleshy fruit of the Apple 



Family. 

 Procumbent. Trailing or lying on the 



ground. 



Prophylla. Bractlets. 

 Prothallium. The sexual generation of 



Pteridophyta. 



Puberulent. With very short hairs. 

 Pubescent. With hairs. 

 Punctate. With translucent dots or 



pits. 



Pungent. With a sharp stiff tip. 

 Pyriform. Pear-shaped. 

 Raceme. An elongated determinate 



newer cluster with each flower pedi- 



celled. 

 Racemose. In racemes, or resembling a 



raceme. 

 Rachilla. The axis of the spikelet in 



grasses. 

 Rachis. The axis of a compound leaf, 



or of a spike or raceme. 

 Radiant. W T ith the marginal flowers 



enlarged and ray-like. 

 Radiate. With ray- flowers; radiating. 

 Radicle. The rudimentary stem of the 



embryo; hypocotyl. 

 Radicular. Pertaining to the radicle or 



hypocotyl. 

 Raphe ( Rhaphe). The ridge connecting 



the hi him and chalaza of an anatro- 



pous or amphitropous ovule; the ridge 



on the sporocarp of Marsilea. 

 Ray. One of the peduncles or branches 



of an umbel; the flat marginal flowers 



in Compositae. 

 Receptacle. The end of the flower stalk, 



bearinr he floral organs; or, in Com- 



