Junes: Flora of Illinois 363 



Oval. Broadly elliptical, with the width more than half the Icntith. 



Ovary. The basal part of the pistil containiiis the ovules: the iiiiinature fruit. 



Ovate. Having an outline like the median longitudinal section of a hen's 

 egg, the broader end downward. 



Ovoid. A solid body o\ate in longitudinal section. 



Ovule. The primordium of a seed in the ovary: the organ which may de- 

 velop after fertilization into the seed. 



Palet. The upper bract which with the lemma encloses the flower in grasses. 

 Palmate (leaf). Radiately lobed or divided, with three or more veins arising 



from one point. 

 Panicle. A compound raceme. 



Paniculate. Borne in panicles, or resembling a panicle. 

 Pannose. Having the appearance or texture of felt or woollen cloth. 

 Papilio.n.aceous. Referring to the peculiar irregular corolla of many Le- 



guminosae, consisting of a larger upper petal {standard) . two oblique 



lateral petals (wings), and the two lower ones conni\ent into a keel. 

 Papillose. Covered with papillae, which are small protuberances. 

 Pappus. The modified limb of the calyx in Compositae, forming a crown of 



variable structure at the summit of the achene. 

 Par.\site. An organism which derives nourishment from another living 



organism. 

 Parietal. Borne on or pertaining to the wall of the ovary or fruit. 

 Pectlxate. Comb-like: pinnatifid with narrow, closely set segments. 

 Pedate. Palmately divided or parted, with the lateral divisions two-cleft. 

 Pedicel. The stalk of a single flower in a cluster. 

 Pedu.ncle. The primary flower stalk which supports either a cluster of 



flowers, or a single flower. 

 Pellucid. Clear, transparent, or translucent. 

 Peltate. Shield-shaped: said of a leaf when the petiole is attached to the 



under side away from the margin or usually not far from the center. 

 Pendent. Hanging down: pendulous. 



Penicillate. Bearing a little tuft of hairs, especially at the tip. 

 Peren.nial. a plant, or part of a plant, which persists for more than two 



seasons. 

 Perfect (flower). Having both stamens and carpels: bisexual. 

 Perfoliate. Said of a leaf when the stem appears to pass through its base. 

 Perianth. The floral envelope: consisting of calyx and corolla: a term com- 

 monly used when there is no clear distinction between calyx and corolla. 

 Pericarp. The wall of the ripened fruit. 



Perigy.nium. The inflated sac (bract) enclosing the pistillate flower in Cat ex. 

 Perigy.nous. Borne around the ovary and not at its base, as in flowers in 



which perianth and stamens are borne on the rim of the hypanthium. 

 Petal. One of the parts of an apopetalous corolla. 

 Petaliferous. Petal-bearing. 

 Petiolate. Having a petiole. 

 Petiole. A leaf-stalk. 

 Petiolulate. Having a petiolulc. 

 Petiolule. Stalk of a leaflet. 

 Phyllopodic. The basal leaves of the fertile stems normally blade-bearing, 



as in species of Carex. 

 Pilose. Pubescent with soft long trichomes. 

 Pilosulous. Minutely pilose. 



