Perianth f£$£ The floral envelopes, especially when not readily distinguishable into 



calyx and corolla. 

 Pericarp 'I': 1 ': The wall of an ovary in fruit. 

 Perigonium 1&M. A perianth. 



Perigyniimi \ [•{ The flask-shaped sac enclosing the achene in Carcx. 

 Perigynous ffl ili. Describing a flower in which the corolla and stamens are borne on 



the calyx tube, surrounding the ovary and remaining free from it, rather 



than being attached below. 

 Perisporc f\i pJHIt The membrane or wall surrounding a spore. 

 Persistent yri iWr'j Not falling off at the end of a single season, as the leaves of 



evergreens. 

 Petal {£ Iff One part of the corolla. 

 Pctaloid 1&M\r Petal-like. 

 Petalous U-fL^'l! Having petals. 

 Pctiolate \\\f] Having a petiole. 

 Petiole ;^||'-] The stalk of a leaf. 

 Petiolule 'K^ll'] The stalk of a leaflet. 

 Phyllaries |gtii Parts of the involucre in Compositac. 

 Phylloclade { \l\K\X A branch which appears and functions like a leaf. 

 Phyllode %\K^i A leaf-like petiole. 

 Pilose T : Having soft distinct hairs. 



Pinna JpjJf A primary part of a pinnate leaf, especially in ferns. 

 Pinnate -PMJvfl'j With leaflets arranged in two ranks along a central rachis. 

 Pinnatiftd -JJ|»'^^ Pinnately cleft. 

 Pinnule '\^} : \V{ A pinnate subdivision of a pinna. 

 Pistil illf ^ The female organ of a flower, consisting of ovary, style (when present) 



and stigma. 

 Pistillate l\$$fy Having a pistil. 



Pistillate flower iltf ft A flower having a pistil but no stamens. 

 Pit i'iu'i A small depression. 

 Pith ft The spongy center of a stem. 



Placenta Hnffi The area in the ovary where the ovules are borne. 

 Plaited \IM\K Folded. 

 Plicate -i\\l\i\>] Folded into plates. 



Plumose ^\\K Feather-like, as a pappus of branched bristles. 

 Plumule K^ The first leaf bud of an embryo. 

 Pod M. A dry many-seeded dehiscent fruit. 

 Pollen Tt i/) The fertilizing powder produced in an anther. 

 Pollination fJ/j'} The placing of the pollen on the stigma. 

 Pollinium itfftty^ A body composed of the cohering mass of pollen grains from a 



single anther cell, as in Orchids. 

 Polygamo-dioecious IfM'^lfr^ Dioeciously polygamous. 

 Poly gamo- monoecious Ht£|WI$fc Monoeciously polygamous. 

 Polygamous H'f4$j Describing a species which produces both bisexual and unisexual 



flowers. 

 Polymorphic #H Showing a variety of forms 

 Poly petalous $|$f Having distinct or separate petals. 

 Polysepalous MM Having distinct or separate sepals. 

 Pome g|| A fleshy inferior fruit enclosing several papery or bony carpels, as in 



571 



