Oblate. Flattened at the poles. 



Oblique. Said of a leaf having one side of the blade lower on the petiole than the 



other (fig. 787). 

 Oblong. Longer than broad, the sides nearly parallel for most of their length (fig. 



787). 

 Obovaie. Ovate in shape, but with the broadest part near the distal end (fig. 



787). 

 Obovoid. Inversely ovoid. 

 Obsolete. Rudimentary or not evident; applied to an organ that is almost entirely 



suppressed; vestigial. Obsolescent: becoming rudimentary or extinct. 

 Obtuse. Having a blunt or rounded terminal part (fig. 787). 

 Ochrea (ocrea). A nodal sheath formed by the fusion of stipules, as in the Poly- 



gonaceae. (fig. 413). 

 Odd-pinnate Said of a pinnately compound leaf having a terminal leaflet, thus 



having an odd, rather than an even, number of pinnae, (fig. 787). 

 Operculate. Having a lid. 

 Operculum. A lid. 

 Opposite. As said of leaves; occurring two at a node on opposite sides of the 



stem. As said of fiower parts; when one part occurs in front of another. 

 Orbicular. Circular in outline. 

 Orifice. The mouthlike opening of a tubular corolla at the junction of limb and 



throat or tube. 

 Orthotropous. Said of seeds that are erect and having their micropyle at the apex. 

 Ovary. The part of the pistil bearing the ovules and maturing to form at least 



part of the fruit which bears the seeds. 

 Ovate. Said of a plane structure having the shape of the outline of an egg (fig. 



787). 

 Ovoid. Egg-shaped. 

 Ovule. An unfertilized egg. 



Palea(e). A hyaline scale; specifically, in the grasses, the upper bract of two ste- 

 rile bracts, subtending a floret; in the Compositae, said of the scalelike pappus 

 (fig. 741). 



Paleaceous. Scalelike. 



Palmate. Having several lobes radiating from a common base like the fingers 

 from the palm of the hand (fig. 787). 



Palmately compound. Said of a leaf divided into discrete segments to a common 

 basal area at the top of the petiole (fig. 787). 



Palmately lobed. Said of appendages when the lobes are so disposed as to appear 

 to radiate from a common basal point (fig. 787). 



Palmately veined. Said of veins when they radiate from a common basal point. 



Paludal. Pertaining to marshes, wet all through the year. 



Palustrine. Occurring in marshy places. 



Paludose. Occurring in marshy places. 



Panicle. A compound inflorescence, that is, one in which the axis is branched one 

 or more times (figs. 108, 788). 



Pannose. Feltlike in texture or appearance. 



Papilionaceous. Butterfly-like; said of the flowers of leguminous plants having a 

 corolla composed of an upright banner and two lateral wings, each representing 

 a single petal, and a keel comprised of two petals variously united (fig. 503). 



Papilla (-ae). A short protuberance. 



Papillate, papillose. Bearing papillae. 



Pappus. The chaff"y, scaly, bristle-like, or plumose structure at the junction of the 

 achene and the corolla in the Compositae (fig. 741). 



1721 



