GLOSSARY 



275 



Perianth. The floral envelope; p. 10. 



Perigynous. Attached to the peri- 

 anth, and therefore around the 

 ovary and not at its base. 



Persistent. Lasting a long time. 



Petal. A division of the corolla; p. 

 10. 



Petiole. The footstalk of a leaf; p. 9. 



Phaenogam. A plant species having 

 flowers with stamens and pistils 

 and producing seeds. 



Pinna (pi. Pinnae). One of the pri- 

 mary divisions of a pinnate or 

 compoundly pinnate frond or 

 leaf; p. 25. 



Pinnate. Compound, with the leaf- 

 lets arranged on each side of a 

 common petiole; p. 9. 



Pinnatifid. Pinnately cleft. 



Pinnule. A secondary pinna; one 

 of the pinnately disposed di- 

 visions of a pinna. 



Pistil. The seed-bearing organ; p. 

 11. 



Pistillate. With pistils but without 

 stamens. 



Placenta (pi. Placentae). The ovule- 

 bearing tissues of an ovary. 



Pod. Any dry fruit, opening at ma- 

 turity. 



Pollen. The fecundating grains in 

 the anther; p. 11. 



Pubescent. With hairs. 



Raceme. A cluster in which the 

 flowers are borne along the cen- 

 tral axis on pedicels of nearly 

 equal length; p. 13. 



Rachis. The axis of a flower-cluster 

 or compound leaf. 



Radiate. Spreading like the spokes 

 of a wheel; bearing ray-flowers; 

 p. 239. 



Ray. The branch of an umbel; the 

 marginal flowers in a head when 

 the corolla is strap-shaped; p. 

 239. 



Receptacle. The end of a pedicel 

 which bears the organs of a 

 flower; pp. 11, 239. 



ReHexed. Bent or turned abruptly 

 downward. 



Regular. Uniform in shape and 

 structure. 



Reniform. Kidney-shaped. 



Root. See p. 7. 



Rootstock. An underground stem; 

 p. 7. 



Rotate. Somewhat flat and circular 

 in outline; wheel-shaped. 



Saprophyte. A plant which derives 

 nourishment from decaying vege- 

 tation. 



Scale. A small thin body. 



Seed. The ripened ovule; p. 12. 



Segment. One of the parts of an 

 organ that is cleft or divided. 

 (In ferns, see p. 25.) 



Sepal. A division of the calyx; p. 10. 



Serrate. With sharp teeth. 



Sessile. Without a footstalk of any 

 kind. 



Sheath. A tubular envelope. 



Shrub. A woody perennial smaller 

 than a tree. 



Silky. Clothed with closely pressed 

 soft straight hairs. 



Simple. Of one piece; not com- 

 pound. 



Smooth, Not rough or hairy. 



Spatulate. Narrowed downward from 

 a rounded summit; p. 9. 



Spike. A cluster in which the 

 flowers are sessile along the cen- 

 tral axis; p. 13. 



Spine. A sharp-pointed hard woody 

 organ. 



Spore. The fruit of ferns and other 

 Cryptogams. 



Spur. A hollow extension. 



Stamen. A pollen-bearing organ; 

 p. 11. 



Staminate. Bearing stamens but not 

 pistils. 



Stem. See p. 7. 



Sterile. Not productive; barren. 



Stigma. A part of the pistil; p. 11. 



Stipulate. Having stipules. 



Stipule. An appendage at base of 

 petiole; p. 9. 



Stolon. Any basal branch that is dis- 

 posed to root. 



Strict. Straight and upright. 



Style. A part of the pistil; p. 11. 



Submerged. Growing under water. 



Succulent. Juicy; fleshy. 



Superior (ovary). Free from calyx; 

 p. 12. 



Sympetalous. Petals united, at least 

 at base, so that they cannot be 

 separated without tearing; p. 11. 



Taproot. A single perpendicular 



root; p. 7. 

 Terete. Cylindric and slightly taper- 

 ing. 

 Throat. The orifice of a calyx or 



corolla. 

 Timber-line. The upper limit of tree 



growth on mountains; p. 4. 

 Tri-pinnate. Thrice pinnate. Also 



written 3-pinnate. 

 Truncate. Cut off squarely at the 



end. 

 Tuber. A short thick underground 



branch or root. 



