GLOSSARY 729 
PapPILLionA’cEous.—Having butterfly-shaped flowers, as in the sub-family Papilio- 
nacee of the Leguminosz. 
PapiIL’LAE.—Small, short, nipple-shaped protuberances of the epidermal cells. 
PAp’ILLosE.—Bearing small, nipple-shaped protuberances. 
Pap’pus.—The calyx of a Composite flower. 
PApyRA’cEOus.—Papery. 
ParaApH’ysis.—A sterile filament found among reproductive organs in certain 
plants. 
ParAsitT’1c.—Growing upon or within and deriving sustenance from another living 
organism. 
PAREN’CHYMA (Fundamental Tissue).—The soft, filling-in tissue of plants consisting 
of more or less isodiametric cells and usually with cellulose walls enclosing 
living contents. 
PARENCHY’MATOUS.—Referring to, consisting of or resembling parenchyma. 
Pari/ETAL.—Situated on or pertaining to the wall of an ovary or pericarp. 
Part’ep.—Incised nearly to the mid-rib or base. 
PARTHENOGEN’ESIS.—The production of an embryo from an unfertilized egg. 
Patruo.’ocy.—The study of diseases. 
Prec’rose.—Carbohydrate cell wall material related to the hemi-celluloses and to 
mucilage. 
Pep’ATe.—Palmately parted or divided with two lateral lobes or divisions from each 
of which more or less linear divisions arise. 
Pep‘iceL.—A branch of an inflorescence axis supporting a single flower. 
Pepun’cLe.—The main stalk of an inflorescence. The flower stalk. 
Pe.iu’crp.—Transparent, clear. 
PEL’TATE.—Shield-shaped and attached by its lower surface to the support. 
Pen’puLous.—Hanging nearly vertically downward, as in the case of some ovules 
that hang from the sides of a locule. 
PenTAM’ERovus.—Applied to flowers having the number five or a multiple thereof 
running throughout each whorl. 
PENTAN’DROUs.—Having five stamens. 
Pr’po.—A fruit of a Cucurbit; a gourd. 
PEREN’NIAL.—Living more than two years. 
Per’rect.—Applied to flowers that contain both stamens and carpels that are 
functionally active. 
PreRro’LIATE.—Applied to leaves which are united around the stem at their base. 
Per’IANTH.—The floral envelopes, calyx and corolla or calyx alone when corolla 
is absent. 
PEr’IBLEM.—A region of meristem lying between the dermatogen and plerome in 
the growing end of a root or stem. The meristem which gives rise to cortex. 
PericAm’s1uM.—A zone of meristematic tissue lying just within the endodermis. 
PrR’IcARP.—The wall of a ripened ovary or fruit surrounding the seed or seeds. 
PericLA’pruM.—A sheathing petiole. 
Per’icycLe.—A region lying between the endodermis and the conducting bundle 
or bundles. 
PER’IDERM.—All of the tissues produced by the phellogen, both externally and 
internally, and including the phellogen itself. 
PeRip’rum.—The outer covering of certain fungus fructifications as puff-balls. 
PER’1GONE.—See perianth. 
