320 GLOSSARY 



pagi'um (Trayos, rocky hill, glacier), a succession in a glacial soil; pagophy- 

 ti'um, a foothill plant formation 



pediophyti'um (ttc^lov, plain), an upland plant formation, 



pelagi'um (7rAayos, surface of the sea), a surface sea formation; pelagad, a 

 plant of the sea surface. 



pelochthi'um (ttt^Xos, mud, ox9r}, bank), a mud bank form; pelogenous, pro- 

 ducing clay; pelopsammic (i/'a/x/xo?, sand), composed of mixed clay and 

 sand ; pelopsammogenous, producing clay and sand. 



permobile, extremely mobile. 



perquadrat, a quadrat of i6 square meters or more. 



petasospore (TrtVao-os, sunshade), a plant with parachute-like disseminules. 



petri um (Trirpa, rock, stone), a rock formation; petrad, a rock plant; 

 pstrochthi'um (oxOrj, bank), a rock bank formation. 



petrodi'uin (Trerpothrji, abounding in boulders), a boulder field formation; pe- 

 trodad, a plant of a boulder field. 



phelH'um (^cWeuj, stony ground), a rock field formation; phellad, a rock 

 field plant. 



-phiious (<^t\os), loving, dwelling in. 



-photic {<f)u)i, <^wrcs, light), pertaining to light; photoharinose, response to 

 light stimuli; photometer, an instrument for measuring light. 



phreti'um ((^pT/ros, tank), a tank formation; phretad, a tank plant. 



phyad {<t>v^, form of growth), a vegetation form, e. g. , tree, shrub, etc. 



-phyll {<f)vWov, leaf), combining term for leaf. 



-phyte (<^vTov, plant), combining term denoting plant; phyteris (Ipi;, strife), 

 plant competition; -phyti'um (<^utciov, place covered with plants), com- 

 binin-T term for formation; phytostrote, a species migrating by means of 

 the plant body. 



pladobole (TrAa^os, moisture), a plant whose seeds are scattered by propulsion 

 due to moisture. 



plasticity, the condition characterized by ready response to stimuli. 



pnoi'um (ttvot}, blast), a succession in an aeolian soil. 



poi'uni (TToa, meadow), meadow formation; poad, a meadow plant; poophyte, 

 a meadow plant. 



polyan'thous (ttoAus, many, avOo's, flower), producing many flowers; poly- 

 chro'nic (xpcVo?, time), arising at two or more times; polyde'mic (8vA">5, 

 district), occurring in two or more formations or natural regions; poly- 

 genesis (ycVecris, origin), the origin of a new form at two or more places 

 or times; polyphyle'sis (<^vXov, race), the origin of a form, species, or 

 genus from two or more ancestral types; polyspermatous ((m-c/j/ta, seed), 

 producing many seeds in each flower; polyto'pic (toitos, place), arising 

 at two or more distinct places. 



