148 Field Manual 



Spine. A sharp thorn-like organ not representing a stem in 

 origin but a leaf or part of a leaf, as the spines on 

 the leaves of the Christmas holly. 



Spore. A modified reproductive cell. 



Sporophyte. The nonsexual generation of plants. 



Spur. A short stunted branch not representing a true dwarf 

 branch and not ending in a thorn-like point ; any pro- 

 jecting appendage of a flower looking like a spur. 



Stamen. The organ of a flower which produces microspor- 

 angia. which contain tbc microspores whioli later de- 

 velop into pollen grains. 



Staminate. Having only stamens or staniinate flowers. 



Stellate. Star-like. 



Sterigma. A small, short, ^leg-like projection on which cer- 

 tain leaves, spores, etc., are borne. 



Sterile. Not producing spores or seeds. 



Stigma. The upper part of the carpel; a special organ of the 

 Angiosperms to catch the pollen grains. 



Stipel. The stipule of a leaflet. 



Stipular scar. The mark made on the l)ark by deciduous 

 stipules. 



Stipular spine. A spine representing a stipule or having the 

 position of a stipule. 



Stipules. Bract-like appendages at the base of the i)etiole 

 of many leaves. 



Strigose. With stiff appressed or ascending hairs. 



Style. The narrow top of the carpel or united carpels be- 

 tween the ovulary and stigma. 



Subulate. Awl-shaped. 



Succulent. Soft and juicy. 



Superposed. Placed one above the other. 



Sympetalous. With petals more or less united. 



Synantlicrous. Having the stamens united by their anthers. 



Syncarp. A fleshy aggregate fruit. 



Terete. Circular in cross section. 



Terminal bud. The bud at the morphological tip of the twig. 

 Ternate. Divided into three segments : arranged in threes. 

 Tetracyclic. A flower with four cycles. 



Tetradj'namous. With four long stamens and two short ones 

 as in the Brassicaceae. 



