GLOSSARY OF BOTANICAL TERMS. 



419 



UkcmiuaCEOUS. — Having orchid-like flow- 

 ers, that is, flowers with a six-leaved, 

 irregular perianth, and the lower leaf 

 developed into a lip. 



Organography. — A description of organs; 

 in botany, a description of the organs that 

 make up the plant body. 



Orthostachy. — A perpendicular row of 

 leaves on the stem. 



Orthotropous. — The same as atropous, 

 q. v. 



OSMOSIS or Osmose. — Terms applied to 

 the diffusion of liquids through animal 

 and vegetable membranes. 



Oval. — Forming a broad ellipse. 



Ovary. — The part of the pistil which con- 

 tains the ovules. 



Ovate. — Applied to a leaf or other flattened 

 organ whose outline resembles that of an 

 egg. 



Ovate-lanceolate. — Between ovate and 

 lanceolate. 



Ovate-oblong. — Between ovate and ob- 

 long. 



Ovoid. — Egg-shaped. Applied to solid 

 bodies. 



Ovulate or Ovuliferous. — Ovule-bear- 



> n g 

 Ovule. — The rudimentary seed; that part 

 of the pistil which contains the embryo- 

 sac. 



DALATE. — A swelling or projection in the 

 throat of that form of the bi-labiate 

 corolla called personate. 



Pales or Palea. — One of the inner bracts 

 of the inflorescence of grasses. Also 

 applied to the flattened brown hairs or 

 chaff found on the stems and leaves of 

 ferns. 



Palisade Tissue. — The green parenchyma 

 next the upper surface of a bi-facial leaf, 

 consisting of cells elongated in a direction 

 perpendicular to the epidermis. 



Palmatifid. — Palmately cleft 



Palm ati lobate. — Palmately -lobed. 



Palm ati sect. — Palmately divided. 



Palmi-nerved. — With simple veins radi- 

 ating from the base to the margin of the 

 lamina. 



Palmi-netted, or Palmi-reticulate. — 

 Netted-veined, with the main veins radi- 

 ating from the base toward the margin of 

 the blade. 



Palloose. — Belonging to or inhabiting 

 marshy places 



Panduriform. — Fiddle-shaped. Applied 

 to certain leaves and other flattened or- 

 gans. 



Panicle. — A compound raceme. 



Papilionaceous. — Butterfly-like A term 

 descriptive of the shape of flowers like 

 those of the Pea and related plants. 



Papillose. — Bearing papillae. 



Pappus. — The modified calyx limb of the 

 florets of the Composite. 



Papyraceous. — Having a papery texture. 



Paraphysis. — A jointed filamentous body 

 found associated with the reproductive 

 organs of some plants, as the Mosses. 



Parasitic. — Applied to organisms that ob- 

 tain their sustenance at the expense of 

 other organisms. 



Parastichies. — A term used to describe 

 the secondary spirals in the compact forms 

 of alternate phyllotaxy. 



Parenchyma. — A tissue made up of thin- 

 walled cells which are commonly blunt- 

 ened and not much longer than broad. 



Parenchymatous. — Pertaining to paren- 

 chyma. 



Parietal. — Belonging to the walls. Ap- 

 plied to placentae that are borne on the 

 walls of the ovary. 



Pari-pinnate. — Pinnate with an even num- 

 ber of leaflets. 



Parted. — Applied to a leaf that is sepa- 

 rated into parts almost to the midrib or 

 base. 



Parthenogenesis. — The production of an 

 embryo without the intervention of the 

 male fertilizing element. 



PaTELliform. — Circular and disc-like, re- 

 sembling the patella or knee-pan. 



Pauciflorous. — Few-flowered. 



Pectin. — The substance found in fruits 



which forms the basis of vegetable jelly. 

 ^ectinate. — Comb-shaped. Applied to a 

 leaf or petal that is parted or divided into 

 rigid segments arranged like the teeth of 

 a comb. 



Pedate. — Palmately parted and with the 

 lateral divisions more or less two-lobed. 



Pedicel. — A partial peduncle, or the stem- 

 let of an individual flower of a cluster. 



Peduncle. — A flower-stalk. The stalk of 

 a flower-cluster is called a common pe- 

 duncle. 



Peltate. — Shield-shaped. Applied to a 

 leaf whose petiole is attached near the 

 centre of the lamina. 



Pelviform.— Shaped like a shallow cup. 



