GLOSSARY. 



285 



Pollinium. A mass of waxy pollen 

 composed of coherent pollen-grains 

 (Orchidaceae) . 



Polygamo-dioecious. With perfect 

 and staminate flowers on some 

 plants and perfect and pistillate 

 flowers on others. 



Polygamous. Having both perfect 

 and unisexual flowers on the same 

 plant. 



Prismatic. Angular with flat sides, 

 like a prism in shape. 



Pruinose. Covered with a whitish 

 powder. 



Puberulent. Minutely pubescent. 



Pubescence. Hairiness. 



Pubescent. Covered with hairs, espe- 

 cially short soft ones. 



Pulvinus. A cushion-like swelling. 



Punctate. Dotted. 



Pungent. Terminated in a rigid 

 sharp point; penetrating. 



Pyramidal. Pyramid-like. 



Pyriform. Pear-shaped. 



Quadrifoliolate. With four leaflets. 



Raceme. A simple inflorescence of 

 pedicelled flowers on a common 

 more or less elongated axis. 



Rachilla. The axis of a grass spikelet. 



Rachis. The main axis of an inflor- 

 escence. 



Radiate. Arranged radially from a 

 center; having ray-flowers. 



Radical. Pertaining to the root; 

 occurring at the base of the stem. 



Raphe. The ridge on a more or less 

 inverted seed caused by the fusion 

 of the stalk with the seed. 



Ray. A branch of an umbel; a ray- 

 flower. 



Ray-flower. One of the marginal 

 ligulate flowers of a radiate head 

 in the Compositae. 



Receptacle. The modified axis on 

 which the flower parts are borne. 



Reniform. Kidney-shaped. 



Resiniferous. Producing resin. 



Reticulated. In the form of a net- 

 work; net-veined. 



Retrorse. Directed backward. 



Rotate. Wheel-shaped; flat and cir- 

 cular in outline. 



Rudiment. A partially developed 

 functionless organ. 



Rugose. Wrinkled. 



Rugulose. Slightly wrinkled. 



Saccate. Sac-shaped. 



Sagittate. Arrow-shaped. 



Salverform. Having a slender tube 

 abruptly expanded into a flat limb. 



Salient. Prominent. 



Samara. An indehiscent winged fruit 

 (Aceraceae). 



Saprophytic. Depending on dead 

 organic matter for its food. 



Scabrid. Minutely scabrous. 



Scabrous. Covered with short hairs 

 or points. 



Scapose. Bearingorresemblinga scape. 



Scarious. Thin dry membranaceous, 

 not green. 



Secund. One-sided. 



Septicidal. Dehiscing through the 

 partitions and between the cells. 



Septifragal. Dehiscing into parts 

 which break away from the parti- 

 tions. 



Serratures. Serrations. 



Serrulate. Finely serrate. 



Setaceous. Bristle-like. 



Sheath. A tubular envelope like the 

 lower part of the leaf in the grasses. 



Silicle. A short silique (Cruciferae) . 



Silique. A long 2-celled slender pod 

 (Cruciferae). 



Sinuate. Outline strongly wavy. 



Sinus. The recess or indentation 

 between two lobes. 



Sordid. Dirty-white. 



Sorus. A cluster of spore-cases; a 

 fruit-dot (Polypodiaceae). 



Spathaceous. Spathe-like. 



Spathe. A large petal-like bract 

 enclosing an inflorescence. 



Spatulate. Gradually narrowed down- 

 ward from a rounded summit. 



Spike. A simple inflorescence with 

 the flowers sessile on a more or 

 less elongated common axis. 



Spikelet. A small spike, especially 

 the peculiarly specialized one in the 

 grasses. 



Spinescenl. Becoming spiny. 



Spinulose. With very small spines. 



Sporangia. Spore-cases. 



Sporocarp. A pod-like structure en- 

 closing the spore-cases (Marsilea- 

 ceae). 



Spur. A hollow sac-like or tubular 

 extension of the calyx or corolla or 

 both, usually nectariferous. 



