APPJSNDIX 469 



{Numbers refer to paragraphs.) 



tains an embryo plant and the office of which is to perpetuate the kind: 



the ripened ovule. 411, 291. 

 Seedling. A plant growing directly from seed, without the intervention of 



grafts, layers or cuttings. 

 Segment, In a leaf-blade, a division extending practically to the midrib. 104c. 

 Self -fertilisation. Action of pollen upon a pistil of the same flower: elos- 



fertilization. 2696. 

 Sepal, One of the parts of a calyx: an outer (and usually green) member of 



a biserial perianth. 146. 

 Sepaloid. Resembling a sepal. 



Septicidal. Said of capsules which dehisce into parts representing the com- 

 ponent carpels. 313ffl. 

 Septifragal. Said of capsules which dehisce septicidally and the outer sides 



or walls of the carpels break away from the dissepiments. 314. 

 Serrate. Saw-toothed. 133. , 



Sessile. Without a stalk or stem. 88o. 



Sheath. A hollow or tubular part, as of a leaf, enclosing a stem or root. 122. 

 Shrub. Ligneous perennial plant with no trunk: bush. 495. 

 Silicle. A short and very broad pod of the mustard family. 307a. 

 Silique. A long pod of the mustard family. 307a. 

 Sinistrorse. From right to left. 501a. 

 Sinuate. Strongly wavy. 133. 



Sinus. The recess or notch in the base of a leaf. 132. 

 Smooth. Not scabrous. 



Sorus. A collection or colony of sporangia in ferns: fruit-dot. 425. 

 Spadix. A spike enclosed or subtended by a'spathe: the axis usually more or 



less fleshy. 191. 

 Spathe. A 1-leaved or 2-leaved involucre enclosing a flower or flower-cluster* 



191, 213. 

 Spatulate. Oblong in general outline, but the upper end broadened. 131. 

 Spavm. Subterranean mycelium of mushroom-like fungi (432, 432a) : also 



cormels (449). 

 Specialisation. In natural history writings, used' to designate modifloation of 



structure or habits enabling an organism to live in particular condi- 

 tions or to perform particular functions. 258a. 

 Species. The unit in elasslflcation. 548. 



Spermatophyte. One of the class of seed-bearing plants. 437a. 

 Spike. A simple and dense elongated flower-cluster in which the individual 



flowers are sessile, or very nearly so, and the lowest flowers ojien first. 



217, 185a. 

 Spikelet. The ultimate flower-cluster in the inflorescence of grasses. 262. 

 Sporangium. Case or body containing the spores. 424. 



